WO2001037448A1 - Dispositif de station de base et procede de reception radio - Google Patents
Dispositif de station de base et procede de reception radio Download PDFInfo
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- WO2001037448A1 WO2001037448A1 PCT/JP2000/008036 JP0008036W WO0137448A1 WO 2001037448 A1 WO2001037448 A1 WO 2001037448A1 JP 0008036 W JP0008036 W JP 0008036W WO 0137448 A1 WO0137448 A1 WO 0137448A1
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- group
- reception
- signal
- communication terminals
- directivity
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/086—Weighted combining using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Definitions
- the present invention relates to a base station device and a radio reception method used in a digital radio communication system.
- An array antenna is an antenna that is composed of multiple antenna elements and that can adjust the amplitude and phase of the signals received by each antenna element and freely set the directivity of reception.
- the adjustment of the amplitude and phase given to the received signal can be performed by multiplying the received signal by a complex coefficient in the received signal processing circuit.
- FIG. 1 is a block diagram showing the configuration of a base station apparatus provided with an array antenna.
- C FIG. 1 shows, as an example, a base station apparatus equipped with an array antenna composed of two antenna elements. It should be noted that a normal base station apparatus is provided with a plurality of systems of received signal processing circuits for demodulating received signals from a plurality of communication terminals, but in FIG. The case where only one signal processing circuit is provided is described.
- the base station apparatus 10 shown in FIG. 1 receives a signal from the communication terminal 16 using the antennas 11 and 12 when communicating with the communication terminal 16.
- the signal received by the antenna 11 is down-converted to the base frequency band or the intermediate frequency band by the reception radio circuit 13 and output to the reception signal processing circuit 15.
- the signal received by antenna 12 is down-converted to a base frequency band or an intermediate frequency band by reception radio circuit 14 and output to reception signal processing circuit 15.
- the reception signal processing circuit 15 performs demodulation processing on the reception signal.
- the received signal processing circuit 15 Adjust the complex coefficient by which the signal is multiplied. This allows the array antenna to strongly receive only electromagnetic waves arriving from the desired direction. Such strong reception of only the electromagnetic wave arriving from the desired direction is called “having directivity of reception”.
- reception directivity By having the reception directivity in the base station apparatus, it is possible to keep the reception SIR (Signal to Interference Ratio: SIR) high.
- SIR Signal to Interference Ratio
- the configuration of the reception signal processing circuit 15 is determined according to the communication system to be used. However, when the base station apparatus performs such array antenna processing for all communication terminals, there is a problem that the processing amount becomes enormous.
- an interference canceller is a very useful means for extracting only a desired signal.
- This interference canceller is used for communication terminals other than the communication terminal of the communication partner). This technology removes signals (interference) from other communication terminals and extracts desired signals from received signals.
- the received signal is stored in the received signal storage unit 21 for each channel corresponding to each communication terminal.
- the stored received signals are sent to the despreading units 22 to 24 for each signal of each communication terminal, where they are despread and demodulated.
- the demodulated signals are output to the channel estimation units 25 to 27, respectively.
- the channel estimators 25 to 27 compare the demodulated signal with the pilot signal, which is a known signal, and obtain a channel estimation value from the comparison result.
- the channel estimation values obtained by the channel estimation units 25 to 27 are output to the replica generation units 28 to 30, respectively.
- the replica generators 28 to 30 generate replica signals from the channel estimation values.
- the replica generators 28 to 30 send the created replica signal to the received signal storage 21 and also send information on the strength of the generated replica signal to the ranking unit 31.
- the ranking unit 31 replicas are provided for each channel corresponding to each communication terminal.
- the communication terminals are ranked in descending order of the received signal based on the signal strength, and the result is sent to the received signal storage unit 21. At this time, the communication terminal with the higher ranking is demodulated as it is.
- the received signal storage unit 21 removes the interference by the high ranking communication terminal by subtracting the large signal and the ranked replica in the ranking unit 31 from the received signal. Also, the received signal storage unit 21 sends the received signal from which interference has been removed to the despreading units 22 to 24, performs the same processing as described above, and performs interference removal from the received signal again. The interference canceller repeats such processing to remove interference from the received signal.
- the signal 41 of the communication terminal 3 is removed first and demodulated by the above-described processing.
- the signal 42 of the communication terminal 2 is removed and demodulated.
- the signal 43 of the communication terminal 1 is demodulated.
- the degree of interference with each communication terminal differs for each communication terminal. That is, as shown in FIG. 4, the order of the magnitudes of the received signals 51, 52 at the communication terminal 1, the received signal 52 at the communication terminal 2, and the received signal 53 at the communication terminal 3 is different. Will come.
- An object of the present invention is to provide an array antenna and an interference canceller in combination, without providing an interference canceller for each channel corresponding to each communication terminal.
- An object of the present invention is to provide a base station apparatus and a radio reception method capable of receiving a desired signal with high quality while reducing the amount of calculation.
- the subject of the present invention is to perform array antenna processing in a limited number of directivity for a large number of communication terminals, to divide the large number of communication terminals into groups corresponding to the number of directivity, and to have the same group in the group.
- the use of an interference canceller and array antenna processing, which are effective means for performing CDMA communication is prepared to increase the number of accommodated communication terminals.
- FIG. 1 is a block diagram showing a conventional base station apparatus
- Figure 2 is a block diagram showing the configuration of the interference canceller
- FIG. 3 is a conceptual diagram showing a signal multiplexed by the CDMA method
- FIG. 4 is a conceptual diagram showing that, when array antenna processing is used for each communication terminal, a signal multiplexed by the CDMA method is different for each communication terminal;
- FIG. FIG. 6 is a block diagram showing a configuration of a base station apparatus according to Embodiment 1;
- FIG. 6 is a conceptual diagram illustrating generation of a group of base station apparatuses according to Embodiment 1 of the present invention;
- FIG. 7 is a block diagram showing an internal configuration of an adaptive signal processing circuit of the base station apparatus according to Embodiment 1 of the present invention.
- FIG. 8 is a block diagram illustrating a configuration of a base station apparatus according to Embodiment 2 of the present invention
- FIG. 9 is a conceptual diagram illustrating generation of a group of base station apparatuses according to Embodiment 2 of the present invention
- FIG. 10 is a conceptual diagram showing a directivity pattern stored in a directivity pattern storage circuit of the base station apparatus according to Embodiment 2 of the present invention.
- FIG. 11 is a conceptual diagram showing a directivity pattern stored in a directivity pattern storage circuit of the base station apparatus according to Embodiment 2 of the present invention.
- FIG. 12 is a block diagram showing a configuration of a base station apparatus according to Embodiment 3 of the present invention. ⁇ diagram;
- FIG. 13 is a diagram showing a concept of performing channel estimation in the base station apparatus according to Embodiment 3 of the present invention.
- FIG. 14 is a diagram showing a directivity pattern of each communication terminal that communicates with the base station apparatus according to Embodiment 3 of the present invention.
- FIG. 15 is a conceptual diagram for explaining generation of a group of base station apparatuses according to Embodiment 3 of the present invention.
- FIG. 16 is a block diagram showing a configuration of a base station apparatus according to Embodiment 4 of the present invention.
- FIG. 17 is a block diagram showing a configuration of a base station apparatus according to Embodiment 5 of the present invention.
- FIG. 18 is a block diagram showing a configuration of a base station apparatus according to Embodiment 6 of the present invention.
- FIG. 19 is a block diagram showing a configuration of a base station apparatus according to Embodiment 7 of the present invention.
- FIG. 20 is a block diagram showing a configuration of a base station apparatus according to Embodiment 8 of the present invention.
- FIG. 21 is a block diagram showing a configuration of a base station apparatus according to Embodiment 9 of the present invention.
- FIG. 5 is a block diagram showing a configuration of the base station apparatus according to Embodiment 1 of the present invention. Here, the case where the base station apparatus performs wireless communication with communication terminals 120 to 122 will be described.
- Receiving wireless circuit 105 to 107, respectively, via antenna 102 to 1 ⁇ 4 Performs predetermined radio reception processing (down conversion, A / D conversion, etc.) on the received signal.
- the base station apparatus of the present embodiment has an array antenna reception function using three antennas, and therefore, there are three antennas and three reception radio circuits, respectively.
- a base station apparatus includes a plurality of baseband signal processing circuits for demodulating signals received from a plurality of communication terminals.
- a base station apparatus includes a plurality of baseband signal processing circuits for demodulating signals received from a plurality of communication terminals.
- the received signal demodulation circuits 108 to 110 perform baseband processing such as CDMA demodulation on the received signals of the communication terminals 120 to 122.
- the incoming wave direction estimating circuit 1 1 1 to L 1 3 performs adaptive signal processing on the signals received from the communication terminals 12 0 to 12 2, respectively, and determines the incoming wave direction of the signal from each communication terminal. Then, the direction of arrival of the signal from each communication terminal is detected.
- the summing circuit 114 sums up the incoming wave direction information from the communication terminals 120 to 122, which is the output from the incoming wave direction estimating circuit 111 to 113.
- the group generating circuit 115 classifies the communication terminals based on the totalized incoming wave direction information.
- the group representative station selection circuit 1 16 selects a communication terminal that is representative of the group for each group generated by the group generation circuit 1 15.
- the adaptive signal processing circuit 117 performs adaptive signal processing on the signal of the communication terminal selected as the representative of the group by the group representative station selection circuit 116, generates directivity, and converts the obtained directivity. Directivity of each group.
- the multipliers 118 and 119 adapt the signals received by the receiving antennas 102 to 104 respectively to the signals subjected to baseband demodulation by the receiving radio circuits 105 to 107 respectively.
- the signal processing circuit multiplies the reception weight that is the directivity of the group generated by the signal processing circuit.
- there are two multipliers because we are considering generating two groups. Next, the operation of the base station apparatus having the above configuration will be described.
- the signals transmitted from the communication terminals 120 to 122 are received by the receiving radio circuits 105 to 107 via the antennas 102 to 104, respectively, and a predetermined radio reception process is performed there. Is made.
- the received signal that has been subjected to the wireless reception processing is sent to multipliers 118 and 119 and also sent to received signal demodulation circuits 108 and L10.
- the communication terminals 120 to 122 receive the signals received from the reception radio circuits 105 to 107, respectively.
- the processing is performed and sent to the incoming wave direction estimation circuits 111 to 113, respectively.
- the arriving wave direction estimating circuits 111 to 113 perform an arriving wave estimating process on the received signal.
- the arriving wave estimation method includes a beamformer method using FFT (Fast Fourier Transform), a linear prediction method, and a minimum norm method, but there is no particular limitation.
- FFT Fast Fourier Transform
- linear prediction method linear prediction method
- minimum norm method minimum norm method
- the summing circuit 114 sums up the results of the estimation of the direction of the incoming wave, thereby ascertaining the direction of the incoming wave of the signal from the communication terminal 120-122.
- tallying is performed by associating each communication terminal with the angle of the incoming wave direction (the angle based on the front direction of the antenna).
- the aggregation circuit 114 outputs information on the direction of arrival of the signal from each of the communication terminals 120 to 122 to the group generation circuit 115.
- the group generation circuit 115 generates a group including communication terminals. That is, the direction of arrival of a signal from a communication terminal is grouped into at least two directivities.
- a case is considered in which communication terminals 120 to 122 are divided into two groups as shown in FIG.
- the group generation circuit 1 15 generates groups as follows. To the group generation circuit 115, the aggregation information in which the communication terminal is associated with the angle of the incoming wave direction is sent from the aggregation circuit 114. The group generation circuit 115 sets the angle range of the group based on the total information so that the number of communication terminals included in one group becomes equal, and generates the group. In this case, the number of groups is set in advance, If the numbers are known, groups can be generated. Therefore, the angle range set for the group is narrower in the direction of dense signal arrival from the communication terminal, and the angle range set for the group is wider in the direction of sparse signal arrival from the communication terminal. .
- the power of the signals received from each communication terminal at the base station is also taken into account, and the signals received from each communication terminal are measured. It is also possible to perform group generation so that power is equalized. In this case, instead of considering all communication terminals, it is also conceivable to consider only the communication terminals that have been found to have a specific power or more at the base station.
- the position of the new communication terminal can be estimated by estimating the direction of arrival to determine which group the new communication terminal belongs to. In the group to which I belong Therefore, the originally used receiving weight can be used from the beginning of communication.
- the county generation in the present invention will be described with reference to FIG.
- the communication terminals 120, 122 are included in the group A 202 by the group generation circuit 115, and the group B 203 is included in the group B 203.
- a group (directivity) including the communication terminals 122 is generated.
- the group generation circuit 1 15 sends the group generation result (the angle setting range of the group and the communication terminals included in the group) to the group representative station selection circuit 1 16.
- the group representative station selection circuit 1 16 selects one representative station from each group. More specifically, the county representative station selection circuit 116 selects a communication terminal with a higher received power (level) of the received signal among the communication terminals included in the group as the group representative station.
- the communication terminal 120 is selected as the representative station from the group A 202 and the communication terminal 122 is selected as the representative station from the group B 203.
- the information of the representative station of each group and the received signal are sent to the adaptive signal processing circuit 117.
- the adaptive signal processing circuit 117 performs adaptive signal processing on the received signal of the representative station in each group to generate a reception weight corresponding to each group. Thereby, reception directivity corresponding to each group is formed.
- the representative station of group A 202 is communication terminal 120 and the representative station of group B 203 is communication terminal 122
- adaptive signal processing circuit 117 Then, adaptive signal processing is performed on the received signals of the communication terminals 120 and 122.
- the adaptive signal processing is performed using an assolego 'rhythm such as LMS (Least Mean Square) RLS (Recursive Least Squares).
- the adaptive signal processing circuit 117 sends a received signal to the channel estimator 301, and performs channel estimation using a pilot part which is a known signal. Estimate the state of the transmission path. This estimated value is sent to replica generator 302. The received signal is sent to channel estimating section 301 after being multiplied by the receiving weight generated in individual receiving weight generating section 303. Now If no receiving weight is generated, omnidirectional weights or fixed weights are multiplied.
- the replica generation unit 302 generates a replica of a signal that will be received through the estimated transmission path using the estimated value. Then, this replica is compared with the known signal, and the error signal is sent to individual reception weight generating section 303.
- the individual reception weight generation unit 303 generates a reception weight using the error signal. At this time, a reception weight is generated using the equation shown in the following equation (1). This reception weight is multiplied by the reception signal, the same processing as described above is performed on the reception signal after the multiplication, and an error signal is sent to the individual reception weight generation unit 303. Then, the individual reception weight generation section 303 generates a reception weight using the error signal. This process is repeated to converge the error signal using, for example, an LMS algorithm. Outputs the reception weight after convergence.
- Wm + l Wm + uE [Xme * m] ... Equation (1) where W: unit value, u: forgetting factor, X: received signal, and e: error signal.
- the reception weights obtained for each group by the adaptive signal processing circuit 117 are sent to multipliers 118 and 119.
- the received signal is multiplied by the reception weight of each group.
- the received signals of the group A 202 and the group B 203 having the respective reception directivities are obtained.
- the multiplier 118 multiplies the reception weight for the group A and the multiplier 119 multiplies the reception weight corresponding to the group B
- the reception signal generated in the multiplier 118 is multiplied.
- Is used in the communication terminals 120 and 121, and the communication terminal 122 uses the received signal generated in the multiplier 119 to perform communication using the reception weight desired for each communication terminal. Becomes possible.
- a group is generated for a plurality of communication terminals, grouping is performed, reception directivity is formed for each group, and all communication terminals belonging to the group are formed. Is applied to the reception directivity of each group.
- each communication end Since the reception directivity is not formed for each corresponding channel, but the reception directivity is formed for each group including multiple communication terminals, the amount of computation is reduced even if the number of communication terminals is large.
- array antenna reception can be performed for all communication terminals. The force s go-between, it is possible to receive the signal in the high-Les, SIR (Signal to Interference Ratio) against Zentsu ⁇ saying ⁇ 3 ⁇ 4 end.
- each group performs adaptive signal processing on the communication terminal of one representative station to generate a reception weight
- a plurality of reception weights are generated for each group.
- the selected communication terminals performs adaptive signal processing on the selected communication terminals, and determines the optimum reception weight from among the reception weights generated by the plurality of communication terminals as needed. good.
- control can be continuously performed even after a communication terminal to be subjected to adaptive signal processing moves or communication ends.
- FIG. 8 is a block diagram showing a configuration of a base station apparatus according to Embodiment 2 of the present invention. 8, the same parts as those in FIG. 5 are denoted by the same reference numerals as in FIG. 5, and the detailed description thereof will be omitted.
- directional pattern storage section 402 is a storage section for storing a plurality of directional patterns in advance.
- the directivity pattern selection circuit 410 stores a directivity pattern that is considered to be most suitable for use at the present time. Select with and assign the selected directivity pattern to each group.
- Multipliers 1 18 and 1 19 respectively convert received signals from communication terminals 12 0 to 12 2 from the directivity patterns of each group selected by directivity pattern selection circuit 401. Multiplies the reception weight of the group to which the communication terminal belongs.
- the operation is the same as in the first embodiment.
- the estimation result of the direction of the arrival wave obtained by the direction-of-arrival-wave estimation circuit 111 to 113 is sent to the totalization circuit 114.
- the summing circuit 114 sums up the results of the estimation of the direction of the incoming wave, thereby ascertaining the direction of arrival of the signal from the communication terminals 120 to 122.
- tallying is performed by associating each communication terminal with the angle of the incoming wave direction (the angle with respect to the front direction of the antenna).
- the tallying circuit 114 outputs information on the direction of arrival of signals from the communication terminals 120 to 122 to the group generation circuit 115.
- the group generation circuit 115 generates a group including the communication terminals. That is, the directions of arrival of signals from communication terminals are grouped into at least two directivities. Here, three antennas are used, and it is possible to generate at least two groups. Therefore, the communication terminals 120 to 122 are divided into two groups as shown in FIG.
- the group generation circuit 1 15 generates groups as follows. To the group generation circuit 115, the aggregation information in which the communication terminal is associated with the angle of the incoming wave direction is sent from the aggregation circuit 114. The group generation circuit 115 sets the angle range of the group based on the total information so that the number of communication terminals included in one group becomes equal, and generates the group. In this case, since the number of groups is set in advance, the groups can be generated if the number of communication terminals is known. Therefore, the angle range set for the group is narrower in the direction of dense signal arrival from the communication terminal, and the angle range set for the group is wider in the direction of sparse signal arrival from the communication terminal. .
- the base station apparatus 501 includes communication terminals 12 0 and 12 1 in group A 5 02 and group B 5 0 3 A group (directivity) including the communication terminals 122 is generated.
- the group generation circuit 115 sends the group generation result (the angle setting range of the group and the communication terminals included in the group) to the directivity pattern selection circuit 401.
- the directivity pattern storage unit 402 Select the combined directivity pattern. Note that the directivity pattern storage unit 402 stores reception weights corresponding to the directivity patterns.
- the directivity pattern storage unit 402 stores the directivity pattern as shown in FIG. 10, the group A 520 when the group is generated as shown in FIG.
- the directivity pattern 602 of FIG. 10 is allocated to the directivity pattern 602 of 0, and the group B 5 ⁇ 3 is allocated.
- the directivity pattern selection circuit 410 sends the reception weights of the selected groups to the multipliers 118 and 119.
- the received signal is multiplied by the reception weight of each group.
- reception signals having the respective reception directivities of the group A502 and the group B503 are obtained.
- the reception directivity for each group is applied to all communication terminals belonging to the group.
- a group is generated for a plurality of communication terminals, grouping is performed, reception directivity is formed for each group, and all communication terminals belonging to the group are formed. Is applied to the reception directivity of each group.
- the reception directivity is not formed for each channel corresponding to each communication terminal, but the reception directivity is formed for each group including a plurality of communication terminals.
- Array antenna reception can be performed for all communication terminals with the amount reduced. Therefore, signals can be received with high SIR for all communication terminals.
- a directivity pattern having an angle setting range different from that of the directivity pattern shown in FIG. 10 may be held and may be appropriately selected.
- an optimal directivity pattern can be adaptively assigned to a group according to the number of communication terminals included in the group and the group configuration.
- reference numeral 6001 denotes a base station apparatus.
- FIG. 12 is a block diagram showing a configuration of a base station apparatus according to Embodiment 3 of the present invention. Here, the case where the base station apparatus performs wireless communication with the communication terminals 8 3 1 to 8 3 3 The case will be described.
- the reception radio circuits 804 to 806 perform predetermined radio reception processing (down-conversion, A / D conversion, etc.) on signals received via the antennas 801 to 803, respectively.
- predetermined radio reception processing down-conversion, A / D conversion, etc.
- the base station apparatus of the present embodiment has an array antenna reception function using three antennas, and therefore, there are three antennas and three reception radio circuits, respectively.
- the received signal demodulation circuits 807 to 809 perform baseband processing such as CDMA demodulation on the received signals of the communication terminals 831 to 833.
- the channel estimating circuits 810 to 812 perform channel estimation on the signals received from the communication terminals 831 to 833, respectively, by using a pilot portion which is a known signal.
- the replica generation circuits 813 to 815 make provisional decisions on the data based on the results of the channel estimation output from the channel estimation circuits 810 to 812, and generate replicas based on the results of the provisional decisions. Generate.
- the individual reception weight generation circuits 8 16 to 8 18 are error signals obtained by subtracting the replicas generated by the replica generation circuits 8 13 to 8 15 from the signals obtained by multiplying the actually received signals by weights. And a received signal, and performs adaptive signal processing using the error signal and the received signal to generate and update a received signal for each channel corresponding to each communication terminal.
- the error signal weighting circuits 819 to 821 receive the error signal, the received signal, and the channel estimation result, and weight the error signal based on them.
- the group generation circuit 82 2 estimates the position of each communication terminal based on the reception weights generated in the individual reception unit 811 to 8 18, and generates a group based on the result. To achieve.
- the error signal averaging circuits 8 23 and 8 24 are based on the group configuration information generated by the group generation circuit 8 22, respectively, and are weighted by the channel estimation values of the communication terminals belonging to each group. Average the signal. Here, weighting based on the channel estimation value may or may not be performed.
- the group-specific reception weight generation circuits 8 25 and 8 26 are configured to use the reception weights used for each group based on the average error signals generated by the error signal averaging circuits 8 23 and 8 24 respectively. Generate a list.
- the signals received by the respective antennas are input to the group-specific reception weight generation circuits 825 and 826, the signals can be used for adaptive signal processing.
- the directivity multiplying circuits 827 and 828 are configured to multiply the signal received from the receiving radio circuit 804-806 by the reception bytes generated by the group-specific reception byte generation circuit, respectively. Give the received signal directivity.
- the interference cancellers 829 and 830 perform an interference canceller process for each group with respect to the received signals having directivity in the directivity multiplying circuits 827 and 828, respectively.
- each group is shown in two series. Next, the operation of the base station apparatus having the above configuration will be described.
- a signal received by the reception radio circuits 804 to 806 is subjected to processing such as despreading processing by a reception signal demodulation circuit 807 and demodulated.
- This demodulated signal is directly sent to the fixed reception weight generation circuit 816 and the error signal weighting circuit 819.
- the demodulated signal is multiplied by the reception weight generated by the individual reception weight generation circuit 816 and sent to the channel estimation circuit 810. In this case, if no receive bytes have been generated yet, the omnidirectional weight value is multiplied by the demodulated signal. It is.
- the channel estimation circuit 810 calculates the phase rotation amount ⁇ 903 of the known pilot signal 901 and the actually input signal 902, as shown in Fig. 13. And calculate a channel estimate. Further, for the data signal, phase rotation compensation is performed by multiplying the obtained channel estimation value, a tentative decision is made based on the result, and the result is transferred to the replica generation circuit 813. Further, the channel estimating circuit 810 sends the channel estimation result to the error signal weighting circuit 819.
- the replica generation circuit 813 generates a replica based on the result of the tentative determination.
- the generated replica signal is subtracted from the reception signal multiplied by the reception weight, and is used to generate an error signal for each communication terminal.
- the generated error signal and the received signal not multiplied by the reception weight are sent to the individual reception weight generation circuit 818 and the error signal weighting circuit 819.
- the individual reception weight generation circuit 816 performs adaptive signal processing using an LMS algorithm, an RLS algorithm, etc., based on the input reception signal and the error signal, and generates a reception weight for each communication terminal.
- the group generation circuit 816 performs adaptive signal processing using an LMS algorithm, an RLS algorithm, etc., based on the input reception signal and the error signal, and generates a reception weight for each communication terminal.
- the error signal weighting circuit 819 weights the input error signal by the channel estimation value.
- the error weighting circuit 8 19 sends the error signal weighted by the channel estimation value to the error signal averaging circuit 8 23.
- the above operation is performed independently for the base-span signal processing units corresponding to each communication terminal and each of them.
- the group generation circuit 822 receives the weight information for each communication terminal from the individual reception weight generation circuits 816 to 818, and based on the reception weight, the incoming wave from each communication terminal. Is estimated, and a group is generated from the estimation results. This group generation will be described with reference to FIGS. 14 and 15.
- the directivities of the communication terminals 83 1 to 833 are indicated as directivity 1001 to 1003, the arriving waves of the signals from the communication terminals 83 1 to 833 are various.
- the information of the group A 1102 generated in this way is sent to the error signal averaging circuit 823, and the information of the group B 1103 is sent to 824.
- the angle setting range of each group is set in the same manner as in the first embodiment.
- the error signal averaging circuits 823 and 824 average the weighted error signals for the communication terminals present in the groups A and B, respectively, and send the averaged reception signal generation circuits 825 and 826 to the respective groups.
- the group-specific receive weight generation circuits 825 and 826 perform adaptive signal processing using the LMS algorithm, RLS algorithm, etc. based on the input average error signal, generate receive weights for each group, and generate The directivity multiplying circuit 827 for generating the directivity of A and the directivity multiplying circuit 828 for generating the directivity of group B are sent.
- the processing when the LMS algorithm is used is performed using the following equation (2). k
- W ⁇ I-unit value for group
- u forgetting factor
- X received signal e
- error signal channel estimation value
- K number of communication terminals in group.
- the directivity multiplying circuits 827 and 828 multiply the signals received by the receiving radio circuits 804 to 806 by the directivities of the groups A and B to generate signals having directivity for each group. I do.
- the generated signals are each sent to an interference canceller 829,830.
- interference cancellers 829 and 830 interference canceller processing is performed independently.
- a group is generated for a plurality of communication terminals, grouping is performed, reception directivity is formed for each group, and all communication terminals belonging to the group are formed. Is applied to the reception directivity of each group. In this case, the reception directivity is not formed for each communication terminal, but the reception directivity is formed for each group including a plurality of communication terminals.
- this base station apparatus since the same reception weight is multiplied to the communication terminals included in each group, the signal power strength of the communication terminals included in the group is uniquely determined. Therefore, it is possible to collectively perform the interference canceller processing on the communication terminals included in this group. This eliminates the need to provide an interference canceller for each channel corresponding to each communication terminal, and allows efficient interference canceller processing with reduced hardware. Therefore, it is possible to use the interference canceller and the array antenna processing, which are effective means for performing the CDMA communication, and increase the number of accommodated communication terminals by providing excellent interference removal capability. be able to.
- FIG. 16 is a block diagram showing a configuration of a base station apparatus according to Embodiment 4 of the present invention.
- the receiving radio circuits 1204 to 1206 demodulate the signals received by the antennas 1201 to 1203, respectively, in a spanned manner.
- a base station apparatus having an array antenna receiving function using three antennas will be described as an example. Therefore, there are three antenna units and three receiving radio circuits, respectively.
- the received signal demodulation circuits 1207 to 1209 perform baseband processing such as CDMA demodulation on the received signals of the communication terminals 1230 to 1232 respectively.
- the auto-correlation matrix generation circuits 1 2 1 0 to 1 2 1 2 each obtain an auto-correlation function from signals received from communication terminals 1 2 3 0 to 1 2 3 2.
- Correlation vector generation circuits 12 13 to 12 15 respectively receive and refer to received signals when pilot signals (known signals) are used as reference signals from communication terminals 12 30 to 12 32. A cross-correlation vector with the signal is determined.
- the individual weight generation circuits 1 2 1 6 to 1 2 1 8 are each composed of an auto-correlation matrix generation circuit 1 2 1 0 to 1 2 1 2, and an auto-correlation matrix generation circuit 1 2 1 3 Calculate and generate an individual reception packet from the cross-correlation vector input from 11 215.
- the group generation circuit 1219 estimates the position of each communication terminal based on the reception weights generated by the individual reception weight generation circuits 1216 to 1218, and based on the result, Create a group.
- the correlation vector synthesizing circuits 122 0 and 122 1 respectively calculate the correlation of the communication terminals belonging to each group based on the group information such as the group configuration generated by the group generating circuit 12 19. Synthesize a kutor.
- the group-specific autocorrelation matrix generation circuits 1 2 2 2 and 1 2 3 recognize each communication terminal belonging to each group based on the group information generated by the group generation circuit 1 2 1 9.
- the autocorrelation matrix used to generate the reception weight for each group is generated using the autocorrelation matrix of the communication terminals belonging to.
- the group-specific autocorrelation matrix generation circuits 1222 and 1223 receive the received signal at each antenna, the autocorrelation matrix of the received signal at the antenna may be obtained.
- the group-specific reception weight generation circuits 1 2 2 4 and 1 2 5 receive the correlation vector from the correlation vector synthesis circuits 1 2 0 and 1 2 1, respectively, and receive the group-specific reception weight generation circuits.
- the autocorrelation matrix is input from 1 2 2 2 and 1 2 2 3, and reception weights for each group are generated from this correlation vector and autocorrelation matrix.
- the reception weight multiplication circuits 1 2 2 6 and 1 2 7 The receiving circuits generated by the circuits 122, 124 and 125 are multiplied by the signals received by the receiving radio circuits 124 to 126 to provide directivity to the received signals.
- Each of the interference cancellers 122 and 128 performs an interference canceller process for each group with respect to the received signal having directivity in the reception weight multiplication circuit.
- each group is shown in two series.
- 1 233-: L 235 is a baseband processing unit corresponding to communication terminals 1 230-1 232, respectively.
- the base station apparatus performs wireless communication with communication terminals 1 230 to 1 32 2
- the signals transmitted from the communication terminals 1 230 to 1 32 32 are received by the receiving radio circuits 1 204 to 1 206 via the antennas 1 201 to 1 203, respectively.
- Baseband signal processing is performed.
- the operation of the processing system of 123 which is a baseband processing unit for the communication terminal 123, will be described, and the baseband processing for the communication terminals 123, 123, which are similar operations, will be described.
- the description of the parts 1 2 3 4 and 1 2 3 5 is omitted.
- a signal received by the reception radio circuits 124 to 126 is subjected to processing such as despreading processing by a reception signal demodulation circuit 127 to be demodulated.
- This demodulated signal is sent to autocorrelation matrix generation circuit 12210 and correlation vector generation circuit 122.
- the autocorrelation matrix generation circuit 1210 generates an autocorrelation matrix using the signal input from the received signal demodulation circuit 1207 as shown in the following equation (3), and separates this autocorrelation matrix into It is sent to the reception wait generation circuit 1 2 16.
- the correlation vector generation circuit 1213 cross-correlates the received signal input from the received signal demodulation circuit 127 with the pilot signal, which is a known signal, as a reference signal. A vector is generated, and this cross-correlation vector is sent to the individual reception weight generation circuit.
- Equation (3) where, rxr: correlation vector between the received signal and the reference signal, 5: forgetting factor, and X: received signal.
- R x (0) ⁇ 5- 'I,, 1,,, R: * x (m-1) X (m) X H (m) R-' x (m-1),
- the reception weight for the communication terminal 1230 is generated using the input autocorrelation matrix and the cross-correlation vector as in the following equation (5).
- the group generation circuit 1219 receives weight information of each communication terminal from the individual reception byte generation circuits 1216 to 1218, and based on the reception weight, the presence of an incoming wave of a signal from each communication terminal. Then, a group is generated using the estimation result.
- This group generation method is the same as in the third embodiment. Here, it is assumed that communication terminals 1230 and 1231 belong to group A, and communication terminal 1232 belongs to group B.
- the information of group A (group configuration and communication terminals) generated in this way is sent to correlation vector synthesis circuit 1220 and group-specific autocorrelation matrix generation circuit 1222, and the information of group B (group configuration and communication terminals) is transmitted.
- the correlation vector synthesis circuit 122 1 and the group-specific autocorrelation matrix generation circuit 1 223 are sent.
- the obtained correlation vectors are combined for each group.
- the combined correlation vector generated by the correlation vector synthesis circuit 122 for group A is sent to the reception weight generation circuit for each group 1224, and the correlation vector for group B is generated.
- the combined correlation vector generated by the combining circuit 122 1 is sent to the group-specific reception weight generating circuit 122 5.
- the group-specific autocorrelation matrix generation circuits 1 2 2 and 1 2 3 the communication terminals 1 2 3 0 and 1 2 3 1 belonging to group A and the communication terminals 1 2 3 2 belonging to group B Then, the obtained autocorrelation matrix is combined for each group, or the autocorrelation matrix of one communication terminal in the county is selected and generated as a group-specific autocorrelation matrix.
- the group-specific autocorrelation matrix generation circuits 1 2 2 and 1 2 3 also receive the received signal of each antenna, the autocorrelation matrix of the received signal at the antenna may be used as the group autocorrelation matrix. No.
- the group-specific autocorrelation matrix generated by the group-specific autocorrelation matrix generation circuit 1 2 2 2 for Group A is sent to the group-specific reception weight generation circuit 1 2 4
- the autocorrelation matrix for each group generated by the autocorrelation matrix generation circuit 122 is sent to the reception weight generation circuit 122 for each group.
- group-specific reception weight generation circuits 122 25, based on the input combined correlation vector value and the group-specific autocorrelation matrix, group-specific reception weights are generated as shown in the following equation (6). Generate weight value. These reception waits for each group are sent to a directional multiplication circuit 122 7 for generating the directivity of the group A and a directional multiplication circuit 122 8 for generating the directivity of the group B, respectively.
- the signals received by the receiving radio circuits 1 2 4 to 1 2 6 are multiplied by the directivities of the groups A and B, respectively.
- Each of the received signals has directivity for each group.
- Signals with directivity for each group are sent to the interference cancellers 122 and 122, respectively.
- signals with directivity for each group are Independently performs interference canceller processing.
- a group is generated for a plurality of communication terminals, grouping is performed, reception directivity is formed for each group, and all communication terminals belonging to the group are formed. Is applied to the reception directivity of each group.
- the reception directivity is not formed for each communication terminal, but the reception directivity is formed for each group including a plurality of communication terminals.
- SIR Signal to Interference Ratio
- the communication terminals included in each group are multiplied by the same reception weight, so that the signal power of the communication terminals included in each group is uniquely determined. Therefore, it is possible to collectively perform the interference canceller processing on the communication terminals included in this group. This eliminates the need to provide an interference canceller for each channel corresponding to each communication terminal, and allows efficient interference canceller processing with reduced hardware. Therefore, it is possible to use the interference canceller and the array antenna processing, which are effective means for performing the CDMA communication, and to increase the number of accommodated communication terminals by providing excellent interference removal capability. it can.
- FIG. 17 is a block diagram showing a configuration of a base station apparatus according to Embodiment 5 of the present invention. Here, a case where the base station apparatus performs wireless communication with communication terminals 1331 to 1333 will be described.
- the receiving radio circuit 1304 to 1306 is an antenna 1300 to 1300
- the baseband demodulation of the signal received at is performed.
- a base station apparatus having an array antenna receiving function using three antennas will be described as an example, and therefore, there are three antennas and three receiving radio circuits, respectively.
- the reception demodulation circuits 1307 to 1309 respectively perform baseband processing such as CDMA demodulation on the reception signals of the communication terminals 1331 to 1333.
- the direction-of-arrival-wave estimating circuits 1310 to 1312 each estimate the direction of the arrival of a signal received from the communication terminal 1321 to 1332.
- the channel estimating circuits 1313 to 1315 perform channel estimation on the received signals from the communication terminals 1321 to 13233, respectively, using the pilot portion which is a known signal.
- the replica generation circuits 13 16 to 13 18 make temporary decisions based on the channel estimation results input from the channel estimation circuits 13 10 to 13 12 respectively. Generate a replica based on the result.
- the error signal weighting circuit 1319 to 1321 subtracts the signal created by the replica generation circuit 1316 to 1318 from the signal obtained by multiplying the actually received signal by weight. The obtained error signal, received signal, and channel estimation result are input, and the error signal is weighted based on these.
- the group generating circuit 1322 generates a group based on the position of each communication terminal estimated by the incoming wave direction estimating circuits 1310 to 1312.
- the average error signal generation circuits 1 3 2 3 and 1 3 2 4 are weighted by the channel estimation values of the communication terminals belonging to each group based on the group information generated by the group generation circuit 1 3 2 2. Average the error signal.
- the group-specific reception weight generation circuits 1325 and 1326 are used for each group based on the average error signals generated by the error signal average circuits 1332 and 1324, respectively. Generates a receiving weight.
- the reception weight multiplication circuits 1327 and 1328 convert the reception weights generated by the group-specific reception weight generation circuits into signals received by the reception radio circuits 1304 to 1306, respectively. Multiplication gives directionality to the received signal.
- Each of the interference cancellers 1329 and 13330 performs an interference canceller process for each group with respect to the reception signal to which the directivity is added in the reception weight multiplication circuit.
- two groups are shown for each group in order to consider generating two groups using three antennas.
- the baseband processing units 1334 to 1336 are baseband processing units corresponding to the communication terminals 1331 to 1333, respectively.
- the base station apparatus performs wireless communication with communication terminals 1331 to 1333.
- the signals transmitted from the communication terminals 1 3 3 1 to 1 3 3 3 are received by the receiving radio circuits 1 3 4 1 to 1 3 0 6 via the antennas 1 3 0 1 to 1 3 0 3 respectively.
- Baseband signal processing is performed.
- the operation of the system of the baseband processing section 1334 on the communication terminal 1331 will be described, and the baseband processing section 1133 on the communication terminals 1332 and 1333 having the same operation will be described.
- the description of the operation of the systems 5 and 1336 is omitted.
- a signal received by the reception wireless circuits 1304 to 1306 is demodulated by a reception signal demodulation circuit 1307 by processing such as despreading processing.
- This demodulated signal is sent directly to the arriving wave direction estimating circuit 1316 and the error signal weighting circuit 1319.
- This demodulated signal is sent to the channel estimation circuit 1313 after being multiplied by the reception weight generated by the group-specific reception weight generation circuit 1325. In this case, if the reception weight has not been generated yet, the omnidirectional weight value is multiplied by the demodulated signal.
- the channel estimation circuit 13 13 calculates the phase rotation amount ⁇ between the pilot signal, which is a known signal, and the actually input signal, and calculates the channel estimation value. Also, for the data signal, phase rotation compensation is performed by multiplying the obtained channel estimation value, a tentative decision is made based on the result, and the result is sent to the replica generation circuit 13 16. The channel estimation result is sent to the error signal weighting circuit 13 23.
- the replica generation circuit 1 3 1 6 A replica is generated based on the result of the provisional determination. The generated replica signal is used to generate an error signal for each communication terminal by subtracting from the reception signal multiplied by the reception weight. The generated error signal and the received signal not multiplied by the reception weight are sent to error signal weighting circuit 1319.
- the error signal weighting circuit 13 19 weights the input error signal by a channel estimation value or the like.
- the weighted channel estimation value is sent to the error signal averaging circuit 13 23.
- weighting may or may not be performed.
- the above operation is performed independently by the paceband processing circuits 1334 to 1336 of each communication terminal.
- the group generation circuit 1322 generates a group based on the arrival directions of the signals from the respective communication terminals estimated by the arrival wave direction estimation circuits 1310 to 1312. This group generation is performed in the same manner as in the third embodiment.
- a group A including the communication terminals 1331 and 1332 and a group B including the communication terminals 1333 are generated.
- the information of the group A is sent to the error signal averaging circuit 1332, and the information of the group B is sent to the error signal averaging circuit 1324.
- the error signal averaging circuits 13 23 and 13 24 average the weighted error signals for the communication terminals belonging to groups A and B, and classify the averaged error signals into groups. It is sent to the reception weight generation circuit 1 3 2 5 and 1 3 2 6.
- the group-specific reception weight generation circuits 1325 and 1326 perform adaptive signal processing using the LMS algorithm, RLS algorithm, etc., based on the input average error signal, and perform group-specific reception weights. , And sends the reception weights for each group to the directional multiplication circuits 1 3 2 7 that generate the directivity of group A and the directional multiplication circuits 1 3 2 8 that generate the directivity of group B. .
- the processing in the case of using the LMS algorithm is performed by the above equation (2).
- the received signal from each antenna is also input to the group-specific received light generation circuits 1325 and 1326, they can be used for adaptive signal processing.
- the signals received by the reception radio circuits 1304 to 1306 are multiplied by the directivities of the groups A and B, respectively. Generate a signal with directivity for each group.
- the generated signals are sent to the interference cancellers 1329 and 1330 respectively.
- interference canceller processing is performed independently for each group.
- a group is generated for a plurality of communication terminals, grouping is performed, reception directivity is formed for each group, and all communication terminals belonging to the group are formed. Is applied to the reception directivity of each group.
- the reception directivity is not formed for each communication terminal, but the reception directivity is formed for each group including a plurality of communication terminals.
- array antenna reception can be performed for all communication terminals. Therefore, signals can be received at a high SIR (Signal to Interference Ratio) for all communication terminals.
- the communication terminals included in each group are multiplied by the same reception weight, so that the signal power of the communication terminals included in each group is uniquely determined. Therefore, it is possible to collectively perform the interference canceller processing on the communication terminals included in this group. This eliminates the need to provide an interference canceller for each channel corresponding to each communication terminal, and allows efficient interference canceller processing with reduced hardware. Therefore, it is possible to use the interference canceller and the array antenna processing, which are effective means for performing the CDMA communication, and to increase the number of accommodated communication terminals by providing excellent interference removal capability. it can. (Embodiment 6)
- FIG. 18 is a block diagram showing a configuration of a base station apparatus according to Embodiment 6 of the present invention. Here, a case where the base station apparatus performs wireless communication with communication terminals 1430 to 1432 will be described.
- Receiving radio circuits 1404-1406 base-band demodulate the signals received at antennas 1401-1403, respectively.
- a base station apparatus having an array antenna receiving function using three antennas has been described as an example, so that three antennas and three receiving radio circuits are provided.
- Received signal demodulation circuits 1407 to 1409 perform baseband processing such as CDMA demodulation on received signals of communication terminals 1430 to 1432 respectively.
- the arriving wave direction estimating circuits 1410 to 1412 estimate the arriving wave direction for the communication terminals 1430 to 1432 respectively.
- the autocorrelation matrix generation circuits 1413 to 1415 each obtain an autocorrelation function from signals received from the communication terminals 1430 to 1432.
- Correlation vector generation circuits 1416 to 1418 find the cross-correlation vector between the received signal and the reference signal when a pilot signal is used as the reference signal from communication terminals 1430 to 1432, respectively. .
- the group generation circuit 1419 generates a group based on the position of each communication terminal estimated by the incoming wave direction estimation circuits 1410 to 1412.
- the correlation vector combining circuits 1420 and 1421 combine the correlation vectors of the communication terminals belonging to each group based on the group information generated by the group generating circuit 1419.
- the group-specific autocorrelation matrix generation circuits 1422 and 1423 recognize the communication terminals belonging to each group based on the group information generated by the group generation circuit 1419, and calculate the autocorrelation matrix of the communication terminals belonging to the group.
- the autocorrelation matrix used to generate the reception weights for each group is generated using
- the group-specific autocorrelation matrix generation circuits 1422 and 1423 also receive signals received by each antenna, the autocorrelation matrix may be used using the signals received by the antennas.
- the group-specific reception weight generation circuits 1 4 2 4, 1 4 2 5 each receive the correlation vector from the correlation vector synthesis circuit 1 4 2 0, 1 4 2 1 and receive the group-specific reception packet generation circuit.
- An autocorrelation matrix is input from 1422 and 1423, and a reception weight for each group is generated from these correlation vectors and the autocorrelation matrix.
- the reception weight multiplication circuits 1 4 2 6 and 1 4 2 7 respectively convert the reception weights generated by the group-specific reception weight generation circuits 1 4 2 4 and 1 4 5 into the reception radio circuit 1 4 4 By multiplying the signal received at .about.1406, the received signal has directivity.
- the interference cancellers 1428 and 14429 perform interference canceller processing for each group with respect to the received signal having directivity in the reception weight multiplication circuit.
- two groups are shown for each group in order to consider generating two groups using three antennas.
- the baseband processing units 1443 to 1345 are baseband processing units corresponding to the communication terminals 144 to 1442, respectively.
- Signals transmitted from the communication terminals 144 to 144 are received by the receiving radio circuits 144 to 140 through the antennas 141 to 1403, respectively.
- Band signal processing is performed.
- the operation of the system of the baseband processing unit 1443 3 for the communication terminal 144 0 will be described, and the baseband processing unit 144 3 for the communication terminals 1441 and 1443 2 having the same operation will be described.
- the description of the operation of the systems 4 and 14 35 is omitted.
- a signal received by the reception radio circuits 144 to 146 is subjected to processing such as despreading processing by a reception signal demodulation circuit 1447 and demodulated.
- This demodulated signal is sent to the auto-correlation matrix generation circuit 14 13 and the correlation vector generation circuit 14 16.
- the autocorrelation matrix generation circuit 1413 generates an autocorrelation matrix using the signal input from the reception signal demodulation circuit 1447 as shown in the above equation (4).
- the correlation vector generation circuit 1416 uses the received signal input from the received signal demodulation circuit 1447 and the pilot signal, which is a known signal, as a reference signal. Generate a correlation vector.
- the group generation circuit 1419 receives the weight information of each communication terminal from the arrival direction estimation circuits 1410 to 1412, and based on the received weight, the arrival of the signal from each communication terminal. The direction is estimated, and a group is generated using the estimation result.
- This group generation method is the same as in the third embodiment.
- a group A that includes communication terminals 144 0 and 1441 and a group B that includes communication terminals 1442 are generated.
- the information of Group A generated in this way is sent to the correlation vector synthesis circuit 144 and the group-specific autocorrelation matrix generation circuit 1442, and the information of Group B is output to the correlation vector synthesis circuit 1442 and the group. It is sent to another autocorrelation matrix generation circuit 1 4 2 3.
- the correlation vector combining circuits 14420 and 14421 the communication terminals 14430 and 1441 belonging to the group A and the communication terminals 14432 in the group B, respectively.
- the obtained correlation vectors are combined for each group.
- the combined correlation vector generated by the correlation vector combining circuit 144 for Group A is sent to the group-specific reception weight generating circuit 144 and the correlation vector combining circuit for Group B is generated.
- the combined correlation vector generated in 1442 is sent to the group-specific reception weight generation circuit 14425.
- the group-specific autocorrelation matrix generation circuits 1 4 2 2 and 1 4 2 communication terminals 1 4 3 0 and 1 4 3 1 belonging to group A and communication terminals 1 4 3 2 Then, the obtained autocorrelation matrices are combined for each group, or the autocorrelation matrix of one communication terminal in the county is selected and generated as a group-specific autocorrelation matrix.
- the group-specific autocorrelation matrix generation circuits 1422 and 1423 also receive the received signal of each antenna, the autocorrelation matrix of the signal received at the antenna may be used as the group-based autocorrelation matrix. No.
- the group-specific autocorrelation matrix generated for the group A by the group-specific autocorrelation matrix generation circuit 1422 is sent to the group-specific reception weight generation circuit 1442, and the group B
- the autocorrelation matrix for each group generated by the autocorrelation matrix generation circuit 144 is sent to the reception gate generation circuit 144 for each group.
- the group-based reception weight generation circuit calculates the group as shown in the above equation (6). Generate a separate receive weight value.
- These reception weights for each group are sent to a directivity multiplying circuit 14427 for generating the directivity of group A and a directivity multiplying circuit 14428 for generating the directivity of group B, respectively.
- the signals received by the receiving radio circuits 144 to 140 6 are multiplied by the directivities of the groups A and B, respectively. Generate a signal with directivity for each group. The generated signals are sent to the interference cancellers 144,28 and 144, respectively.
- the interference canceller processing is performed independently for each group.
- a group is generated for a plurality of communication terminals, grouping is performed, reception directivity is formed for each group, and all communication terminals belonging to the group are formed. Is applied to the reception directivity of each group.
- the reception directivity is not formed for each communication terminal, but the reception directivity is formed for each group including a plurality of communication terminals.
- array antenna reception can be performed for all communication terminals. Therefore, signals can be received at a high SIR (Signal to Interference Ratio) for all communication terminals.
- the communication terminals included in each group are multiplied by the same reception weight, so that the signal power of the communication terminals included in each group is uniquely determined. Therefore, the communication terminals included in this group are Cancellation processing can be performed. This eliminates the need to provide an interference canceller for each channel corresponding to each communication terminal, and allows efficient interference canceller processing with reduced hardware. Therefore, it is possible to use the interference canceller and the array antenna processing, which are effective means for performing the CDMA communication, and to increase the number of accommodated communication terminals by providing excellent interference removal capability. it can.
- FIG. 19 is a block diagram showing a configuration of a base station apparatus according to Embodiment 7 of the present invention. Here, a case will be described where the base station apparatus performs wireless communication with communication terminals 1539 to 1541.
- the receiving radio circuits 1504 to 1506 perform baseband demodulation of signals received by the antennas 1501 to 1503, respectively.
- a base station apparatus having an array antenna receiving function using three antennas will be described as an example, and therefore, there are three antennas and three receiving radio circuits, respectively.
- the baseband processing sections 1507 to 1509 perform baseband processing on the received signals of the communication terminals 1539 to 1541 respectively.
- the received signal demodulation circuits 1515 to 1512 perform processes such as CDMA demodulation on the received signals of the communication terminals 1539 to 1541, respectively.
- the adaptive signal processing circuits 1513 to 1515 perform adaptive signal processing on the signals received from the communication terminals 1539 to 1541, respectively, to generate reception weights, and to multiply reception by eight. And demodulation of information.
- the TPC information demodulation circuit 1516 to 1518 receives the signal obtained by multiplying the actually received signal by the weight from the adaptive signal processing circuit 1513 to 1515, and outputs the TPC information ( Demodulate the transmission power control signal).
- the generation wait notification circuit 15 19 to 15 21 inputs the reception wait generated by the adaptive signal processing circuit 15 13 13 to 15 15 and sends it to the group generation circuit and error signal generation circuit. Notice.
- Error signal notification circuit 1 5 2 2 to 1 5 2 4 The error signal used to generate the reception weight in 3 to 15 15 is input and notified to the group generation circuit and error signal generation circuit.
- the channel estimation value notification circuits 15 25 to 15 27 receive the channel estimation values used when the reception signal is generated by the adaptive signal processing circuits 15 13 15 to 15 15, respectively. Notify the generation circuit and error signal generation circuit.
- the group generation circuit 1528 divides the communication terminals into a plurality of groups based on the reception weights input from the generation wait notification circuits 1519 to 1521.
- the group-specific error signal generation circuits 1529 and 1530 are configured to output the groups input from the channel estimation value notification circuit based on the group information generated by the group generation circuits 1528.
- An error signal used to generate a reception weight for each group is generated using the channel estimation value of the communication terminal to which the terminal belongs and the error signal input from the error signal notification circuit.
- the group-specific reception weight generation circuits 1531 and 1532 are used for each group based on the average error signals generated by the error signal average circuits 1529 and 1530, respectively. To generate the received wait weight.
- the reception weight multiplication circuits 1 5 3 3 and 1 5 3 4 are the signals received by the reception radio circuits 1 5 0 to 1 5 0 6 generated by the reception weight generation circuit for each group. Is multiplied to give the received signal directivity.
- Each of the interference cancellers 15 35 and 15 36 performs an interference canceller process for each group with respect to the received signal having the directivity by the reception weight multiplication circuit.
- the transmission power control circuit 1537 determines the transmission power based on the TPC information demodulated by the TPC information demodulation circuits 1516 to L518.
- the transmission signal generation circuit 1538 generates a signal to be transmitted to the communication terminal.
- the signals transmitted from the communication terminals 1 5 3 9 to 1 5 4 1 are respectively received by the receiving radio circuits 1 5 1 0 to 1 5 0 2 via the antennas 1 5 1 to 1 5
- Baseband signal processing is performed.
- the operation of the system of baseband processing section 1507 for communication terminal 1539 is described, and baseband processing section 1505 for communication terminals 1540 and 1541, which operates similarly.
- the description of the operation of the 8, 15 9 system is omitted.
- a signal received by the reception radio circuit 1504 to 1506 is subjected to processing such as despreading processing by a reception signal demodulation circuit 15010 and demodulated.
- This demodulated signal is sent to adaptive signal processing circuit 15 13.
- the adaptive signal processing circuit 1513 performs signal processing using an LMS algorithm or an RLS algorithm to generate a reception weight, and multiplies the received signal by the reception weight. Processing using the LMS algorithm is performed using the above equation (1).
- the adaptive signal processing circuit 1513 generates the reception weight, the channel estimation value, and the error signal as described in the above embodiment.
- the signal resulting from the multiplication is sent to the TPC information demodulation circuit 15 16, the generated reception weight is sent to the generation weight notification circuit 15 19, and the channel estimation value used when generating the reception weight is calculated.
- the channel estimation value notification circuit 1 5 2 5 is sent, and the error signal is sent to the error signal notification circuit 1 5 2 2.
- the TPC information demodulation circuit 15 16 receives the signal that can be received at a higher SIR by multiplying the received signal from the adaptive signal processing circuit 15 13 by the reception weight. Demodulate TPC information.
- the TPC demodulation is performed because the TPC information sent from the communication terminal needs to be immediately reflected in the signal transmitted from the base station. Therefore, unlike other signals, the interference cancellers 15 3 5 and 15 This is because a delay for transmitting the signal to 36 to remove the interference is not allowed. Since the configuration does not impose a load on the configuration in which demodulation is performed by multiplying individual reception weights for each communication terminal, in this embodiment, instead of using an interference canceller, individual reception
- the TPC information is demodulated using the signal multiplied by the weight.
- the demodulated TPC information is sent to the transmission power control circuit 1537, and is used for transmission power control when transmitting the transmission signal generated by the transmission signal generation circuit 1538.
- the above processing is similarly performed in the other base processing sections 1508 and 1509.
- the weight information of each communication terminal is received from the generation wait notification circuit 1519 to 1521, and the signal from each communication terminal is received based on the received weight.
- the direction of arrival is estimated and a group is generated using the estimation result, or the group is generated based on null information generated in each communication terminal.
- the group generation method for estimating the direction of arrival of a signal from each communication terminal is the same as that in the third embodiment.
- a group A including the communication terminals 1539 and 1540 and a group B including the communication terminals 1541 are generated.
- the information of the group A thus generated is sent to the error signal generation circuit 1529, and the information of the group B is sent to 1530.
- communication terminals having similar null information belong to the same group.
- the error signal generation circuits 1529 and 1530 receive the error signals and the channel estimation values for the communication terminals in groups A and B, and determine the reception weight for each group based on the received signals. An error signal to be generated is generated, and this error signal is sent to the reception weight generation circuits 1531 and 1532 for each group.
- the group-specific reception weight generation circuits 1531 and 1532 perform adaptive signal processing using the LMS algorithm or RLS algorithm based on the input error signal for each group, and receive signals for each group. A weight is generated, and the received weight is sent to a directional multiplication circuit 1533 for generating the directivity of the group A and a directional multiplication circuit 1534 for generating the directivity of the group B, respectively.
- the LMS algorithm when the error signal of each communication terminal is weighted by the channel estimation value of each communication terminal and the signal averaged by all the communication terminals in the group is used as the error signal. Is performed using the above equation (2).
- the signals received by the receiving radio circuits 1504 to 1506 are multiplied by the directivities of groups A and B, respectively. Generate a signal with directivity for each group. The generated signals are used as interference cancellers. Sent to 1535, 1536.
- the interference canceller processing is performed independently for each group.
- a group is generated for a plurality of communication terminals, grouping is performed, reception directivity is formed for each group, and all communication terminals belonging to the group are formed. Is applied to the reception directivity of each group. Therefore, signals can be received at a high signal to interference ratio (SIR) for all communication terminals.
- SIR signal to interference ratio
- transmission power control information and the like for which delay is not allowed in information demodulation are demodulated by multiplying individual reception weights, and delay is allowed in information demodulation.
- Information can be demodulated by multiplying the reception weight for each group, and signal processing can be performed according to the nature of the information.
- the communication terminals included in each group are multiplied by the same reception weight, so that the signal power of the communication terminals included in each group is uniquely determined. Therefore, it is possible to collectively perform the interference canceller processing on the communication terminals included in this group. This eliminates the need to provide an interference canceller for each channel corresponding to each communication terminal, and allows efficient interference canceller processing with reduced hardware. Therefore, it is possible to use the interference canceller and the array antenna processing, which are effective means for performing the CDMA communication, and to increase the number of accommodated communication terminals by providing excellent interference removal capability. it can.
- FIG. 20 is a block diagram showing a configuration of a base station apparatus according to Embodiment 8 of the present invention. 20, the same parts as those in FIG. 5 are denoted by the same reference numerals as those in FIG. 5, and detailed description thereof will be omitted.
- the count generation result (for example, the angle setting range of the group and the communication terminals included in the group) obtained by the count generation circuit 115 is input, and There is provided a beam forming circuit 1601 for forming a beam so as to direct a beam to each group based on the group.
- the direction of arrival is estimated from the received signal, and the group generation circuit 115 generates a group for a plurality of channels using the direction of arrival. Do.
- This group generation result is sent to the beam forming circuit 1601.
- the beam forming circuit 1601 generates a reception weight for generating a beam having directivity for each group generated by the group generating circuit 115.
- reception weight for example, it is possible to perform a beamforming type process used in the conventional array antenna for a communication terminal that is in the center of the group.
- beamforming is performed on a plurality of communication terminals in the group, and the most suitable reception weight is selected from the beamforming by combining them and multiple reception weights are combined. It can also be generated.
- the received bytes generated by the beam forming circuit 1601 are sent to multipliers 118 and 119.
- multipliers 118 and 119 the received signal is multiplied by the reception weight of each group.
- a reception signal having reception directivity for each group can be obtained.
- a group is generated for a plurality of communication terminals, grouping is performed, reception directivity is formed for each group, and all communication terminals belonging to the group are formed. Is applied to the reception directivity of each group. In this case, each communication end Since the reception directivity is not formed for each corresponding channel, but the reception directivity is formed for each group including multiple communication terminals, the amount of computation is reduced even if the number of communication terminals is large.
- array antenna reception can be performed for all communication terminals. Therefore, signals can be received with a high SIR for all communication terminals.
- a transmission weight for performing transmission using an adaptive array antenna is generated using a reception weight (group weight) generated for each county, and the transmission weight is generated.
- AAA adaptive array antenna
- FIG. 21 is a block diagram showing a configuration of a base station apparatus according to Embodiment 9 of the present invention. 21, the same parts as those in FIG. 5 are denoted by the same reference numerals as those in FIG. 5, and detailed description thereof will be omitted.
- the reception weight (group weight) for each county obtained by the adaptive signal processing circuit 117 is input, and the transmission weight is determined using the group weight.
- a transmission signal generation circuit 170 that generates a transmission signal by multiplying the transmission weight obtained by the weight generation circuit 1701 and the transmission weight obtained by the transmission weight generation circuit 1701 over the transmission data. 2 and a transmission radio circuit 1703 to 1705 for performing predetermined radio transmission processing (D / A conversion, up-conversion, etc.) on the transmission signal.
- the direction of arrival is estimated from the received signal, and the group generation circuit 115 generates a group for a plurality of channels using the direction of arrival. Do. Then, a reception weight (group weight) for each county is obtained using the county generation result. This group weight is sent to the transmission weight generation circuit 1701. In the transmission weight generation circuit 1701, the transmission weight is obtained using the group weight.
- a method of obtaining a transmission weight from a group weight a method of using a reception weight generated as a group weight as it is, or a method of obtaining a group weight in consideration of a fact that reception and transmission of a base station have different frequencies. For example, the received weight generated is converted.
- the transmission weight obtained by the transmission weight generation circuit 1701 is sent to the transmission signal generation circuit 1702.
- the transmission signal generation circuit 1702 generates a transmission signal by multiplying the digitally modulated transmission data by a transmission weight.
- This transmission signal is sent to transmission radio circuits 1703 to 1705 corresponding to antennas 102 to 104, and a predetermined radio transmission process (D / A conversion cap conversion) is performed on the transmission signal. Etc.) are performed.
- the transmission signal subjected to the wireless transmission processing is transmitted to communication terminals 120 to 122 via antennas 102 to 104.
- a group is generated for a plurality of communication terminals, grouping is performed, reception directivity is formed for each group, and all communication terminals belonging to the group are formed. Is applied to the reception directivity of each group.
- the reception directivity is not formed for each channel corresponding to each communication terminal, but the reception directivity is formed for each group including a plurality of communication terminals.
- Array antenna reception can be performed for all communication terminals with the amount reduced. Therefore, signals can be received with high SIR for all communication terminals. Also, with this configuration, it is not necessary to determine the transmission weight for each communication terminal, so that the processing amount can be reduced.
- the transmission signal to each communication terminal is orthogonalized, it is possible to remove inter-symbol interference.
- this orthogonality is broken.
- the method of the interference canceller and the like are not particularly limited, and any of a single-user type, a multi-user type, and a multi-stage type may be used.
- the present invention is not limited to Embodiments 1 to 9 above, and can be implemented with various modifications.
- the contents of the first to ninth embodiments can be implemented in an appropriate combination.
- a base station apparatus comprises: a direction estimating unit for estimating directions of arrival of signals from a plurality of communication terminals; and at least one communication terminal based on the respective directions of arrival of the signals from the plurality of communication terminals.
- a group generation unit that generates a group that includes the following: a reception direction is formed for each group, and an array antenna process is performed on all communication terminals included in the group using the reception direction. And an array antenna processing unit for performing the processing.
- group generation is performed for a plurality of communication terminals, grouping is performed, and reception directivity is formed for each group, and reception directivity for each group is set for all communication terminals belonging to the group. Is applied.
- the reception directivity is not formed for each channel corresponding to each communication terminal, and the reception directivity is formed for each group including a plurality of communication terminals.
- Array antenna reception can be performed for all communication terminals with the amount reduced. Therefore, it is possible to receive signals at all communication terminals (in contrast, high, SIR (Signal to Interference Ratio)).
- the array antenna processing unit selects one communication terminal from among the communication terminals included in the group, and receives reception directivity for the communication terminal by the group.
- a configuration used as directivity is adopted.
- a configuration is adopted in which the reception directivity for the communication terminal having the highest reception level is used as the reception directivity of the group.
- the array antenna processing unit includes a holding unit that holds the directivity pattern and a reception wait that realizes the directivity pattern, and the reception wait held by the holding unit. Therefore, a configuration is adopted in which a reception weight corresponding to the group is selected.
- the base station apparatus of the present invention employs a configuration in which, in the above configuration, the array antenna processing unit forms reception directivity for each group using an autocorrelation matrix and a cross-correlation vector obtained from a received signal.
- the base station apparatus of the present invention employs, in the above configuration, an interference canceller that performs an interference canceller process on a signal after the array antenna process.
- the communication terminals included in each group are multiplied by the same reception weight, so that the signal power strength of the communication terminals included in each group is uniquely determined. Therefore, it is possible to collectively perform the interference canceller processing on the communication terminals included in this group. This eliminates the need to provide an interference canceller for each channel corresponding to each communication terminal, and allows efficient interference canceller processing with reduced hardware. Therefore, it is possible to increase the number of accommodated communication terminals by enabling the use of an interference canceller and array antenna processing, which are effective means for performing CDMA communication, and by providing excellent interference cancellation capability. .
- the base station apparatus of the present invention in the above-described configuration, includes: a demodulation unit that demodulates transmission power control information using a signal multiplied by a weight; and a transmission power control unit that controls transmission power according to the demodulated transmission power control information.
- the base station apparatus of the present invention in the above configuration, includes: a transmission directivity generation unit that determines transmission directivity using reception directivity formed for each county; and a transmission unit that transmits a signal with the transmission directivity.
- the configuration provided is adopted.
- the radio receiving method of the present invention includes: a direction estimating step of estimating directions of arrival of signals from a plurality of communication terminals; and at least one communication terminal based on the respective directions of arrival of signals from the plurality of communication terminals.
- group generation is performed for a plurality of communication terminals, grouping is performed, reception directivity is formed for each group, and reception communication for each group is performed for all communication terminals belonging to the group. Is applied.
- the reception directivity is not formed for each channel corresponding to each communication terminal, and the reception directivity is formed for each group including a plurality of communication terminals.
- Array antenna reception can be performed for all communication terminals with the amount reduced. Therefore, signals can be received with high SIR for all communication terminals.
- the wireless receiving method of the present invention is the method according to the above method, further comprising: An interference canceller process for performing an interference canceller process on the signal is provided.
- the communication terminals included in each group are multiplied by the same reception weight, so that the signal power of the communication terminals included in each group is uniquely determined. Therefore, it is possible to collectively perform the interference canceller processing on the communication terminals included in this group. This eliminates the need to provide an interference canceller for each channel corresponding to each communication terminal, and allows efficient interference canceller processing with reduced hardware. Therefore, it is possible to use the interference canceller and array antenna processing, which are effective means for performing CDMA communication, and to increase the number of accommodated communication terminals by providing excellent interference cancellation capability. .
- the wireless communication method includes: a direction estimating step of estimating directions of arrival of signals from a plurality of communication terminals; and at least one communication terminal based on the respective directions of arrival of the signals from the plurality of communication terminals.
- the reception directivity is given to each group, thereby facilitating the realization of the interference canceller.
- the delay caused by the implementation of the interference canceller is not allowed, for the transmission power control information for which communication quality cannot be improved by the interference canceller, the reception Depending on the characteristics, communication that enables reception at the highest SIR is possible.
- the base station apparatus of the present invention when performing array antenna processing, groups communication terminals into several groups based on the direction of arrival of signals from the communication terminals, Use the same reception weight for the communication terminal to which it belongs.
- adaptive signal processing is individually performed on a plurality of communication terminals, and there is no need to multiply different reception weights for each communication terminal, and array antenna processing can be performed with a small amount of computation.
- the signal strength of the communication terminals in the group can be uniquely determined by the above grouping, there is no need to provide an interference canceller for each channel corresponding to each communication terminal, and the interference canceller can be implemented on a small hardware scale. Processing can be realized.
- the present invention can be applied to a base station apparatus and a radio reception method in a digital radio communication system.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Transmission System (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00976247A EP1146665A1 (en) | 1999-11-18 | 2000-11-15 | Base station device and radio receiving method |
KR1020017008971A KR20010101556A (ko) | 1999-11-18 | 2000-11-15 | 기지국 장치, 무선 수신 방법 및 무선 통신 방법 |
AU14120/01A AU1412001A (en) | 1999-11-18 | 2000-11-15 | Base station device and radio receiving method |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11-327961 | 1999-11-18 | ||
JP32796199 | 1999-11-18 | ||
JP2000-008364 | 2000-01-17 | ||
JP2000008364A JP2006041562A (ja) | 1999-11-18 | 2000-01-17 | 基地局装置及び無線受信方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001037448A1 true WO2001037448A1 (fr) | 2001-05-25 |
Family
ID=26572715
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2000/008036 WO2001037448A1 (fr) | 1999-11-18 | 2000-11-15 | Dispositif de station de base et procede de reception radio |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1146665A1 (ja) |
JP (1) | JP2006041562A (ja) |
KR (1) | KR20010101556A (ja) |
CN (1) | CN1337101A (ja) |
AU (1) | AU1412001A (ja) |
WO (1) | WO2001037448A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003110485A (ja) * | 2001-09-27 | 2003-04-11 | Kddi Corp | 無線チャネルスケジューリング方法及びその装置、移動通信システム |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SG153656A1 (en) * | 2001-11-29 | 2009-07-29 | Interdigital Tech Corp | Efficient multiple input multiple output system for multi-path fading channels |
JP3895228B2 (ja) * | 2002-05-07 | 2007-03-22 | 松下電器産業株式会社 | 無線通信装置および到来方向推定方法 |
DE10334842B4 (de) * | 2003-07-30 | 2005-06-02 | Infineon Technologies Ag | Gewichtungsschaltung für einen Mehrträger-Signalempfänger |
JP4716896B2 (ja) * | 2006-02-22 | 2011-07-06 | 株式会社トヨタIt開発センター | 通信エリア制御装置、通信エリア制御方法、車載機 |
JP4991593B2 (ja) * | 2008-02-19 | 2012-08-01 | 株式会社日立製作所 | 無線通信装置 |
EP2120364B1 (en) | 2008-05-16 | 2010-07-14 | Alcatel Lucent | Semi-static beamforming method and apparatus thereof |
US9450655B2 (en) * | 2013-09-27 | 2016-09-20 | Nec Corporation | Two-stage precoding and user grouping for large scale multiple-input multiple-output (MIMO) systems |
JP6418988B2 (ja) * | 2015-03-10 | 2018-11-07 | Kddi株式会社 | ビーム制御方法、基地局及び通信システム |
JP7463309B2 (ja) | 2021-02-12 | 2024-04-08 | ソフトバンク株式会社 | ユーザ装置の角度情報に基づくHAPS向けMassive MIMO |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0779475A (ja) * | 1992-10-19 | 1995-03-20 | Northern Telecom Ltd | 基地局アンテナ・アレンジメント |
JPH0779476A (ja) * | 1993-08-12 | 1995-03-20 | Northern Telecom Ltd | ベース局アンテナ装置 |
JPH10126139A (ja) * | 1996-10-18 | 1998-05-15 | Toshiba Corp | アダプティブアンテナ |
JPH10285646A (ja) * | 1997-03-31 | 1998-10-23 | Radio Frequency Syst Inc | 陸上移動無線システムにおける連続干渉評価および回避 |
JPH10285107A (ja) * | 1997-03-31 | 1998-10-23 | Radio Frequency Syst Inc | 陸上移動無線システムにおけるトラフィック分布分析 |
JP2000138605A (ja) * | 1998-10-30 | 2000-05-16 | Nec Corp | マルチユーザ受信装置 |
-
2000
- 2000-01-17 JP JP2000008364A patent/JP2006041562A/ja active Pending
- 2000-11-15 KR KR1020017008971A patent/KR20010101556A/ko not_active Application Discontinuation
- 2000-11-15 EP EP00976247A patent/EP1146665A1/en not_active Withdrawn
- 2000-11-15 AU AU14120/01A patent/AU1412001A/en not_active Abandoned
- 2000-11-15 CN CN00802694A patent/CN1337101A/zh active Pending
- 2000-11-15 WO PCT/JP2000/008036 patent/WO2001037448A1/ja not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0779475A (ja) * | 1992-10-19 | 1995-03-20 | Northern Telecom Ltd | 基地局アンテナ・アレンジメント |
JPH0779476A (ja) * | 1993-08-12 | 1995-03-20 | Northern Telecom Ltd | ベース局アンテナ装置 |
JPH10126139A (ja) * | 1996-10-18 | 1998-05-15 | Toshiba Corp | アダプティブアンテナ |
JPH10285646A (ja) * | 1997-03-31 | 1998-10-23 | Radio Frequency Syst Inc | 陸上移動無線システムにおける連続干渉評価および回避 |
JPH10285107A (ja) * | 1997-03-31 | 1998-10-23 | Radio Frequency Syst Inc | 陸上移動無線システムにおけるトラフィック分布分析 |
JP2000138605A (ja) * | 1998-10-30 | 2000-05-16 | Nec Corp | マルチユーザ受信装置 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003110485A (ja) * | 2001-09-27 | 2003-04-11 | Kddi Corp | 無線チャネルスケジューリング方法及びその装置、移動通信システム |
JP4637421B2 (ja) * | 2001-09-27 | 2011-02-23 | Kddi株式会社 | 無線チャネルスケジューリング方法及びその装置、移動通信システム |
Also Published As
Publication number | Publication date |
---|---|
JP2006041562A (ja) | 2006-02-09 |
KR20010101556A (ko) | 2001-11-14 |
AU1412001A (en) | 2001-05-30 |
CN1337101A (zh) | 2002-02-20 |
EP1146665A1 (en) | 2001-10-17 |
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