WO2006092830A1 - Appareil de reception - Google Patents

Appareil de reception Download PDF

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Publication number
WO2006092830A1
WO2006092830A1 PCT/JP2005/003287 JP2005003287W WO2006092830A1 WO 2006092830 A1 WO2006092830 A1 WO 2006092830A1 JP 2005003287 W JP2005003287 W JP 2005003287W WO 2006092830 A1 WO2006092830 A1 WO 2006092830A1
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WIPO (PCT)
Prior art keywords
signal
output
desired signal
estimation unit
interference
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Application number
PCT/JP2005/003287
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English (en)
Japanese (ja)
Inventor
Masatsugu Higashinaka
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by Mitsubishi Denki Kabushiki Kaisha filed Critical Mitsubishi Denki Kabushiki Kaisha
Priority to PCT/JP2005/003287 priority Critical patent/WO2006092830A1/fr
Priority to JP2007505751A priority patent/JPWO2006092830A1/ja
Publication of WO2006092830A1 publication Critical patent/WO2006092830A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/005—Control of transmission; Equalising

Definitions

  • the present invention relates to a receiving apparatus, and more particularly to a receiving apparatus having a function of removing an interference signal component contained in a received signal.
  • co-channel interference is a major factor that degrades communication quality. Therefore, co-channel interference countermeasures in digital wireless communication systems are an important issue. For example, in a digital wireless communication system represented by an asynchronous cellular system between base stations, generally, frame synchronization is taken between the same channel interference signal arriving at a receiver and a desired signal of the own system. Therefore, some kind of interference countermeasures must be taken for unknown co-channel interference signals.
  • Patent Document 1 One of the documents disclosing the co-channel interference cancellation technique on the receiver side in such an environment is, for example, Patent Document 1 below.
  • a transmission path estimation value for a desired signal of its own system is estimated using a known sequence, while a transmission path estimation value of a co-channel interference signal is arbitrarily set to an initial value. Temporarily set to the value.
  • these channel estimation values and the received signal are used, and the sequence estimation process considering the state of the interference signal is repeated a plurality of times, and the desired signal is updated while updating the channel estimation value of each channel.
  • a transmission signal sequence is estimated and output.
  • the interference cancellation technology shown in Patent Document 1 repeats sequence estimation multiple times, gradually improving the estimation accuracy of the transmission path and the accuracy of the estimated sequence, and the interference signal. The component is suppressed.
  • Patent Document 1 European Patent Application Publication No. 1475933
  • the initial value of the transmission path estimation value for the interference signal transmission path is provisionally set to an arbitrary initial value, and the accuracy is gradually increased in the subsequent iterative sequence estimation processing.
  • the estimated value does not converge to sufficient accuracy, sufficient accuracy such as processing time constraints is ensured, and the estimated value must be used, and a good interference cancellation effect cannot be obtained. There was a problem.
  • the present invention has been made in view of the above, and achieves satisfactory interference removal while shortening the processing time required for transmission path estimation of the interference signal transmission path or reducing the processing amount (scale).
  • An object of the present invention is to provide a receiving apparatus that can ensure the effect.
  • the receiving apparatus receives M (M is an integer of 1 or more) N signals (N is an integer of 1 or more) that receives multiplexed signals.
  • An analog signal processing unit that converts an analog signal obtained by down-converting each received signal from the antenna to a digital signal, and a digital signal demodulation unit that demodulates the digital signal output from the analog signal processing unit.
  • the digital signal demodulating unit is configured to estimate a predetermined parameter related to a desired signal based on the digital signal and a known signal that is foresight information; and the desired signal An interference signal parameter estimation unit that estimates a predetermined parameter related to the interference signal based on an output signal of the parameter estimation unit, and an output signal of the desired signal parameter estimation unit And an equalizer for outputting, as demodulated data, an equalization processing output performed on the received signal based on the output of the interference signal parameter estimation unit or Z and the desired signal parameter.
  • the estimation unit is based on a desired signal transmission path estimation unit that outputs a transmission path estimation value of the desired signal as one of the predetermined parameters related to the desired signal, a transmission path estimation value of the desired signal, and the known signal Replica raw for generating a replica signal of the desired signal And a replica subtracting unit that outputs a subtracted output obtained by subtracting the replica signal of the desired signal from the received signal as a desired signal replica removal signal.
  • a replica subtracting unit for estimating a predetermined norm on a desired signal based on a received signal and a known signal that is foresight information
  • the desired signal parameter estimator provided with each part outputs the output of the desired signal transmission path estimation section as a desired signal transmission path estimation value, and the subtraction output obtained by subtracting the replica signal of the desired signal from the received signal. Output as a replica removal signal.
  • the transmission path of the interference signal is estimated using the subtraction output obtained by subtracting the replica of the desired signal, the transmission path estimation of the interference signal is performed. Therefore, it is possible to estimate with high accuracy without being influenced by the desired signal, and it is possible to provide good communication in which the influence of interference is suppressed.
  • FIG. 1 is a block diagram showing an overall configuration of a receiving apparatus according to Embodiments 1 to 15 of the present invention.
  • FIG. 2 is a block diagram showing a configuration of a digital signal demodulator according to the first embodiment of the present invention.
  • FIG. 3 is a block diagram showing a configuration of a desired signal parameter estimation unit according to the first exemplary embodiment shown in FIG.
  • FIG. 4 is a block diagram showing a configuration of a digital signal demodulator according to the second embodiment of the present invention.
  • FIG. 5 is a block diagram showing a configuration of a desired signal parameter estimation unit according to the second embodiment shown in FIG.
  • FIG. 6 is a block diagram showing a configuration of a digital signal demodulator according to the third embodiment of the present invention.
  • FIG. 7 is a block diagram showing a configuration of a digital signal demodulator according to the fourth embodiment of the present invention.
  • FIG. 8 is a block diagram showing a configuration of a desired signal parameter estimation unit according to the fourth embodiment shown in FIG.
  • FIG. 9 is a block diagram showing a configuration of a digital signal demodulator according to the fifth embodiment of the present invention.
  • FIG. 10 is a block diagram showing a configuration of an interference signal parameter estimation unit according to the fifth embodiment shown in FIG.
  • FIG. 11 is a block diagram showing an overall configuration of a receiving apparatus according to the sixth embodiment of the present invention.
  • FIG. 12 is a block diagram showing a configuration of a digital signal demodulator according to the sixth embodiment shown in FIG. 11.
  • FIG. 13 is a block diagram showing a configuration of a desired signal parameter estimation unit according to the sixth embodiment shown in FIG.
  • FIG. 1 is a block diagram showing an overall configuration of the receiving apparatus according to the first embodiment 15 of the present invention.
  • FIG. 2 shows an example of the configuration of the digital signal demodulator 103 shown in FIG. 1, and is a block diagram showing the configuration of the digital signal demodulator 103a according to the first embodiment of the present invention.
  • FIG. 3 shows an example of the configuration of desired signal parameter estimation section 202 shown in FIG. 2, and is a block diagram showing the configuration of desired signal parameter estimation section 202 according to the first embodiment of the present invention.
  • the receiving apparatus according to the first embodiment of the present invention includes an antenna (receiving antenna) 101, an analog signal processing unit 102, and a digital signal demodulating unit 103.
  • the digital signal demodulator 103a shown in FIG. 1 includes a known signal storage memory 201, a desired signal parameter estimator 202, an interference signal parameter estimator 203, and an equalizer 204.
  • desired signal parameter estimation section 202 shown in FIG. 2 includes replica subtraction section 301, replica generation section 302, and desired signal transmission path estimation section 303.
  • a signal (received signal) received by an antenna 101 is divided into a process in which an analog signal processing unit 102 down-converts a high-frequency analog signal into a baseband signal and a process in which the analog signal is converted into a digital signal. Done.
  • the digital signal converted by the analog signal processing unit 102 is output to the digital signal demodulation unit 103 that forms the core of the invention of the first embodiment.
  • the digital signal (received signal) output from analog signal processing section 102 is output to desired signal parameter estimation section 202 and equalizer 204.
  • the desired signal parameter estimation unit 202 estimates the transmission path for the desired signal based on the digital signal (received signal) output from the analog signal processing unit 102 and the known signal stored in the known signal storage memory 201 in advance. Predetermined parameters including values etc. (for example, estimation information such as timing of desired signal and received power, etc. are estimated).
  • the interference signal parameter estimation unit 203 based on the output information such as the transmission path estimation value output from the desired signal parameter estimation unit 202, the predetermined parameters related to the interference signal (similar to the desired signal, For example, estimated information such as a channel estimation value and received power) is estimated.
  • the predetermined parameters related to the interference signal similar to the desired signal, For example, estimated information such as a channel estimation value and received power
  • the processing method of the interference signal parameter estimation unit 203 for example, any blind estimation method that is widely known in the related art can be applied.
  • equalizer 204 predetermined parameter and interference signal parameter estimation unit 203 relating to the digital signal (received signal) output from analog signal processing unit 102 and the desired signal output from desired signal parameter estimation unit 202. Based on the predetermined parameters related to the interference signal output from, an equalization process is performed in consideration of the state of the desired signal and the interference signal, and the demodulated data of the received signal is output.
  • a processing method of the equalizer 204 for example, a maximum likelihood sequence estimation which is a known technique can be applied.
  • the demodulated data which is output data of the equalizer 204 includes information on a desired signal and an interference signal depending on conditions such as the level of interference strength and a transmission path.
  • the output of the equalizer 204 is fed back to perform parameter estimation regarding a desired signal or an interference signal. Therefore, in the following description, the output (demodulated data) of the equalizer 204 will be referred to as “determination value”.
  • desired signal parameter estimation section 202 shown in FIG. 3 will be described.
  • a received signal that is an input signal to desired signal parameter estimation section 202 is input to revolver subtraction section 301 and desired signal transmission path estimation section 303.
  • a known signal that is an input signal to desired signal parameter estimation section 202 is input to replica generation section 302 and desired signal transmission path estimation section 303.
  • the desired signal transmission path estimation unit 303 Based on these two input signals, the desired signal transmission path estimation unit 303 performs a transmission path estimation process of the desired signal by applying a technique such as a least square method that has been widely used in the past.
  • the channel estimation value of the desired signal estimated at this time (hereinafter “desired signal channel estimation value”) is transmitted to the replica generation unit 302 and also output to the equalizer 204 shown in FIG.
  • the replica generation section 302 generates a replica of the desired signal using the known signal and the desired signal transmission path estimation value.
  • the replica subtracting unit 301 performs a process of subtracting the replica of the desired signal generated by the replica generating unit 302 from the received signal power. Is output to the interference signal parameter estimation unit 203 shown in FIG.
  • the receiving apparatus configured as described above has the following advantages.
  • the interference signal transmission path is estimated from the signal obtained by subtracting the replica of the desired signal, the interference signal transmission path is estimated by the influence of the desired signal. Can be estimated with high accuracy without being received, and a highly accurate equalization process can be performed in the subsequent equalizer, and as a result, good communication with suppressed influence of interference can be provided.
  • parameter estimation of interference signals is performed separately from equalization processing, so it is not necessary to perform iterative sequence estimation as in the prior art, and it is possible to provide good communication with a smaller amount of computation. become.
  • the replica subtraction unit serves as means for estimating a predetermined parameter related to a desired signal based on the received signal and the known signal that is the foresight information.
  • a replica subtracting unit and a desired signal transmission path estimating unit, and a subtracted output obtained by subtracting the replica signal of the desired signal from the received signal is output as a desired signal replica removal signal by these components. Therefore, the transmission path estimation of the interference signal can be accurately estimated without being affected by the desired signal, and good communication with suppressed influence of the interference can be provided.
  • the interference signal parameter estimation is performed separately from the equalization processing in the processing of the above-described components, it is not necessary to perform repetitive sequence estimation, and good communication can be performed with a smaller amount of computation. It can be provided.
  • the known signal input to desired signal parameter estimation section 202 has been described as being provided from a known signal storage memory as shown in FIG.
  • a known signal generation circuit may be separately provided without being held in advance, and a configuration may be adopted in which it is generated each time when necessary.
  • desired signal parameter estimation section 202 and interference signal parameter estimation section 203 are signal level detection circuits other than the configuration sections described in the present embodiment that output transmission path estimation values of desired signals and interference signals. Needless to say, those including other components such as a timing detection circuit are also included in the present invention.
  • FIG. 4 is a block diagram showing the configuration of the digital signal demodulator 103b according to the second embodiment of the present invention
  • FIG. 5 shows the configuration of the desired signal parameter estimating unit 401 according to the second embodiment shown in FIG. It is a block diagram which shows a structure.
  • the difference from Embodiment 1 is that, as shown in FIGS. 4 and 5, feedback processing is added so that the output of interference signal parameter estimation section 203 is output to desired signal parameter estimation section 401. is there.
  • the configuration of each part is the same as or equivalent to the configuration of the first embodiment, and these parts are denoted by the same reference numerals.
  • the desired signal transmission path estimation unit 501 generates at least three pieces of output information obtained by allocating the received signal and the known signal to the interference signal transmission path estimated value (hereinafter referred to as “interference signal transmission path estimated value” ⁇ ⁇ ). Based on this, the transmission path of the desired signal is estimated.
  • the replica force generation unit 302 generates a replica of the desired signal based on the known signal and the desired signal transmission path estimation value, and outputs the generated replica of the desired signal to the replica subtraction unit 301.
  • the replica subtraction unit 301 performs a process of subtracting the replica of the desired signal from the received signal power, and outputs the signal after removing the replica of the desired signal to the interference signal parameter estimation unit 203.
  • interference signal parameter estimation section 203 uses a conventionally well-known method (eg, blind estimation), and removes the desired signal output from desired signal parameter estimation section 401 after replica removal. Based on the signal, the transmission channel estimation value of the interference signal is estimated and output to the equalizer 204 and the desired signal parameter estimation unit 401. Desired signal parameter estimation section 401 repeatedly performs desired signal parameter estimation based on the interference signal transmission path estimation value output from interference signal parameter estimation section 203.
  • a conventionally well-known method eg, blind estimation
  • the interference signal transmission path estimation value used in desired signal parameter estimation section 401 in the initial processing, for example, a predetermined initial value such as “0” is set.
  • a predetermined initial value such as “0” is set.
  • the interference signal transmission path estimation value output from the interference signal parameter estimation unit 203 is input.
  • the desired signal transmission path estimation value and the interference signal are based on the received signal, the known signal that is foresight information, and the interference signal transmission path estimation value output information. Since a predetermined meter such as a transmission path estimation value is estimated, highly accurate parameter estimation is possible, and a better interference cancellation effect can be obtained.
  • FIG. 6 is a block diagram showing a configuration of the digital signal demodulator 103c according to the third embodiment of the present invention.
  • the digital signal demodulator 103c shown in the figure receives the known signal output from the known signal storage memory 201 and the determination value output from the equalizer 204 in the configuration of the first embodiment.
  • One of them is configured to include a switch 601 as output switching means (first output switching means) for outputting to the desired signal parameter estimation unit 202.
  • Other configurations are the same as or equivalent to those of the first embodiment, and these portions are denoted by the same reference numerals.
  • the switch 601 outputs the known signal output from the known signal storage memory 201 to the desired signal parameter estimation unit 202 at the processing timing for the known signal portion of the desired signal, and the determination value by the equalizer 204 is After being obtained, the judgment value from the equalizer 204 is output.
  • the desired signal parameter estimation unit 202 performs parameter estimation of the desired signal based on the determination value from the equalizer 204 after the determination value by the equalizer 204 is obtained. It's a little bit.
  • desired signal parameter estimation is performed according to the presence / absence of a determination value output from the equalizer 204. Since the output to the unit 202 is switched, it is possible to estimate the transmission path with high accuracy following the fluctuation of the transmission path, and to obtain a higher interference suppression effect.
  • predetermined values such as a desired signal transmission path estimation value and an interference signal transmission path estimation value are determined based on a known sequence portion of a desired signal and demodulated data.
  • the high-precision tracking of transmission path fluctuations Transmission path estimation is possible, and a higher interference suppression effect can be obtained.
  • FIG. 7 is a block diagram showing the configuration of the digital signal demodulator 103d according to the fourth embodiment of the present invention.
  • FIG. 8 shows the configuration of the desired signal parameter estimating unit 701 according to the fourth embodiment shown in FIG. It is a block diagram which shows a structure.
  • These digital signal demodulator 103d and desired signal parameter estimator 701 are configured as follows, assuming that the configuration of Embodiment 1 is developed.
  • digital signal demodulating section 103d shown in FIG. 7 has the same structure as that of digital signal demodulating section 103a in Embodiment 1 shown in FIG.
  • the output of the estimation unit 203 is input, and a switch 702 is provided as output control means for controlling whether or not the output from the interference signal parameter estimation unit 203 is output to the equalizer 204.
  • the desired signal parameter estimation unit 701 shown in FIG. 8 estimates the level of the interference signal in the configuration of the desired signal parameter estimation unit 202 according to the first embodiment shown in FIG.
  • a part 801 is further provided. Note that configurations other than those shown here are the same as or equivalent to the configurations of the first embodiment, and these portions are denoted by the same reference numerals.
  • a desired signal transmission path estimation unit 303 performs transmission path estimation of a desired signal based on a received signal and a known signal. For example, a least square method can be applied to estimate the transmission path of the desired signal.
  • the estimated desired signal transmission path estimation value is output to the replica generation unit 302 and also to the equalizer 204 shown in FIG.
  • the replica generation unit 302 generates a replica of the desired signal based on the known signal and the desired signal transmission path estimation value, and outputs it to the replica subtraction unit 301.
  • the replica subtraction unit 301 performs a process of subtracting the replica of the received signal power desired signal.
  • the output is output to the interference signal level estimation unit 801 and also output to the interference signal parameter estimation unit 203.
  • the interference signal level estimation unit 801 measures the interference signal level based on the received signal before replica subtraction of the desired signal and the output signal after replica subtraction of the desired signal, and the switching shown in FIG. Is output to the unit 702.
  • the interference signal level signal only needs to include an index indicating the strength of the co-channel interference signal arriving at the receiver, for example, the average signal power to interference power ratio, Average interference signal power or the like can be used.
  • interference signal parameter estimating section 203 applies a technique such as blind estimation, for example, to the desired signal output from desired signal parameter estimating section 701 after removal of the replica. Based on this, parameters such as the interference signal transmission path estimation value are estimated and output to the switch 702. In switch 702, the interference signal level signal output from desired signal parameter estimation section 701 and the interference signal transmission path estimation value output from interference signal parameter estimation section 203 are input, and the interference signal transmission path estimation value is equalized. Whether or not to output to the generator 204 is controlled.
  • the switch 702 holds a predetermined threshold value related to the interference signal level (referred to as “threshold value a”) inside, for example, the interference signal level signal is a threshold value. Only when a exceeds a, the interference signal transmission path estimation value, for example, output from the interference signal parameter estimation unit 203 is output to the equalizer 204. That is, the switch 702 operates to control whether or not to output the output of the interference signal parameter estimation unit 203 to the equalizer 204 based on the output of the desired signal parameter estimation unit 701.
  • the equalizer 204 performs an equalization process in consideration of the state of the interference signal based on the received signal, the output from the desired signal parameter estimation unit 701, and the output of the switch 702, and outputs a determination value. As is clear from the above, when the switch 702 determines that the interference signal level signal is below the threshold value a, the interference channel transmission path estimation value is output to the equalizer 204. First, the equalizer 204 performs the equalization process without considering the interference signal.
  • the switch that is the output control means performs the interference signal parameter estimation based on the interference signal level signal that is the output of the desired signal parameter estimation unit.
  • the power output to the equalizer is controlled. Therefore, since the interference signal level is small, the influence of the estimation error on the interference signal transmission path estimation value in the case can be eliminated, and it is possible to provide good communication.
  • a configuration for controlling whether to output the output of the interference signal parameter estimation unit to the equalizer based on the interference signal level signal that is the output of the desired signal parameter estimation unit can also be applied to the configurations of the second and third embodiments, and the same effects as those of the second and third embodiments can be obtained. Obtainable.
  • the interference signal parameter estimation unit 203 is triggered by the result. It is good also as a structure which operates. Further, the equalizer 204 itself may have a threshold value determination function, and the configuration may be such that the state of the interference signal is considered or ignored. Further, the threshold value a of the interference signal level signal may be input from the outside rather than being held in the switch 702. Furthermore, the threshold value a need not be a fixed value, but may be configured to be input as an external variable parameter.
  • FIG. 9 is a block diagram showing the configuration of the digital signal demodulator 103e according to the fifth embodiment of the present invention.
  • FIG. 10 shows the configuration of the interference signal parameter estimating unit 901 according to the fifth embodiment shown in FIG. It is a block diagram which shows a structure.
  • These digital signal demodulating section 103e and interference signal parameter estimating section 901 are configured as follows, assuming that the configuration of Embodiment 3 is developed.
  • digital signal demodulating section 103e shown in FIG. 9 has the same structure as that of digital signal demodulating section 103c used in Embodiment 3 shown in FIG. Is added to the interference signal parameter estimation unit 901.
  • Other configurations are the same as or equivalent to those of the third embodiment, and these portions are denoted by the same reference numerals.
  • interference signal parameter estimation section 901 shown in FIG. 10 receives a switch 1001 to which a signal after removal of a desired signal replica is input, and a blind connected to switch 1001 respectively.
  • Output for switching control as the output of the interference signal parameter estimation unit 901, whichever of the output signals respectively output from the transmission channel estimation unit 1002 and the transmission channel estimation unit 1003, and the blind transmission channel estimation unit 1002 and the transmission channel estimation unit 1003
  • a switching device 1004 as switching means (second output switching means).
  • an interference signal determination value which is a feedback output from the equalizer 902 is input to the transmission path estimation unit 1003.
  • the signal after the replica of the desired signal output from the desired signal parameter estimation unit 202 is input to the switch 1001, and the switch 1001 performs blind transmission at the processing timing of the known signal portion of the desired signal. Output to the path estimation unit 1002 and output to the transmission path estimation unit 1003 at other timings.
  • the blind transmission path estimation unit 1002 performs interference signal transmission path estimation using a known blind estimation method, and outputs the estimation result to the switch 1004.
  • the transmission path estimation unit 1003 uses a technique such as a least-square method that has been widely known based on the output signal from the switch 1001 and the judgment value of the interference signal output from the equalizer 902.
  • the transmission path of the interference signal is estimated using this, and the estimation result is output to the switch 1004.
  • the switch 1004 operates in conjunction with the switch 1001. That is, the signal from the blind channel estimation unit 1002 is output at the timing of processing the known signal portion of the desired signal, and the signal from the channel estimation unit 1003 is output at other timings. In this manner, the output signal from the switch 1004 is output to the equalizer 902 as the interference signal transmission path estimation value.
  • the equalizer 902 outputs the determination value of the interference signal considered during the equalization process in addition to the determination value of the desired signal as a result of the equalization process.
  • the equalizer 902 any equalizer that can perform an equalization process in consideration of the state of the interference signal can be applied.
  • the decision value which is the output of the equalizer 902, is output to the interference signal parameter estimation unit 901, and as already described, the transmission of the interference signal is performed at a timing other than the known signal portion of the desired signal. Used for path estimation.
  • the desired signal can be fed back.
  • the signal path of the desired signal and the interference signal can be continuously estimated even at timings other than the known signal part of the signal, and more accurate channel estimation can be performed, resulting in good interference cancellation characteristics. be able to.
  • the switch 1004 has an output control function for the equalizer 902, the signal after removing the replica of the desired signal without using the switch 1001 is used as the blind channel estimation unit 1002 and the channel estimation. It may be configured to input directly to both parts 1003.
  • FIG. 11 is a block diagram of an overall configuration of the receiving apparatus according to the sixth embodiment of the present invention.
  • the receiver shown in the figure has N antennas (receive antennas) 1 101— 1— 1101— N, N analog signal processing units 1102 — 1— 1102 — N, and digital A signal demodulator 1103 is provided.
  • a feature of the receiving apparatus of this embodiment is that signals received by N receiving antennas are transmitted to a digital signal demodulating section, and equalization processing is performed in consideration of the state of interference signals.
  • the signal arriving at the N antennas may be a signal multiplexed and transmitted simultaneously from a plurality of antennas on the transmitter side (not shown) like so-called MIMO (Multiple Input Multiple Output) transmission.
  • MIMO Multiple Input Multiple Output
  • the desired signal and the interference signal are M multiplexed signals transmitted substantially simultaneously from M (M is an integer of 1 or more) antennas on the transmitter side, and these M multiplexed signals are received.
  • M Multiple Input Multiple Output
  • FIG. Figure 12 is shown in Figure 11.
  • FIG. 13 is a block diagram showing the configuration of the digital signal demodulator 1103 according to the sixth embodiment
  • FIG. 13 is a block diagram showing the configuration of the desired signal parameter estimation unit 1202 according to the sixth embodiment shown in FIG. is there.
  • the digital signal demodulator 1103 shown in FIG. 12 is configured to include a known signal storage memory 1201, a desired signal parameter estimator 1202, an interference signal parameter estimator 1203, and an equalizer 1204.
  • the connection configuration is the same as or equivalent to the digital signal demodulator 103a according to the first embodiment shown in FIG.
  • the desired signal parameter estimation unit 1202 and the equalizer 1204 have a function for processing the N system received signal.
  • desired signal parameter estimation section 1202 shown in FIG. 13 is configured to include replica subtraction section 1301, replica generation section 1302, and desired signal transmission path estimation section 1303, and the connection configuration thereof is shown in FIG. This is the same as or equivalent to the desired signal parameter estimation unit 202 according to the first embodiment. Further, like the digital signal demodulator 1103, it has a function for processing N-system received signals.
  • a desired signal transmission path estimation unit 1303 performs transmission path estimation of a desired signal based on N-system received signals and known signals. Note that when M multiplexed signals are received using N antennas 1101-1-11101-N, there are MXN transmission paths for the desired signal, and it is necessary to estimate all of them. Can be executed by adopting a method using, for example, an orthogonal code as a known signal. Replica generation section 1302 generates N replicas corresponding to each of the N received signals based on the desired signal transmission path estimation value output from desired signal transmission path estimation section 1303 and the input known signal.
  • the replica subtracting unit 1301 performs a process of subtracting N kinds of replicas generated by the replica generating unit 1302 from the input N system received signals. As a result of these processes, the desired signal transmission path estimation value is output to the equalizer 1204 shown in FIG. 12, and the N-system signal after the replica of the desired signal is removed is the interference signal parameter estimation unit 1203 shown in FIG. Is output.
  • interference signal parameter estimation section 1203 has been widely known conventionally.
  • the transmission path estimation value of the interference signal is estimated based on the N-system signal after removing the replica of the desired signal, and output to the equalizer 1204.
  • the equalizer 1204 is based on the N-system received signal, the desired signal transmission path estimation value, and the interference signal transmission path estimation value! Then, demodulation processing is performed in consideration of the state of the interference signal.
  • a single digital signal processor that processes N received signals in which the outputs of N analog signal processing units connected to N antennas are combined.
  • the digital signal demodulator is prepared for each receiving antenna, and the demodulated data output from each digital signal demodulator is combined. Monkey.
  • the receiving apparatus according to the present invention is useful as a receiving apparatus applicable to a mobile communication environment in which co-channel interference due to an interference signal becomes a problem.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

L’invention concerne un appareil de réception possédant une fonction de suppression de composants de signal d’interférence, qui assure un bon effet de suppression d’interférence tout en réduisant le temps de traitement nécessaire à l’estimation de la voie de transmission des signaux d’interférence ainsi que la quantité de traitement (échelle) requise. Un appareil de réception comprend les deux parties suivantes : une partie de traitement de signal analogique qui convertit un signal analogique obtenu en abaissant un signal reçu en un signal numérique et une partie de démodulation de signal numérique qui démodule le signal numérique de la partie de traitement du signal analogique. La partie d’estimation du paramètre de signal désiré (202) de la partie de démodulation du signal numérique comprend une voie de transmission du signal désiré (303) qui produit une valeur d’estimation de la voie de transmission d’un signal désiré sous forme de paramètre prédéfini relatif au signal désiré, une partie de génération de réplique (302) qui génère, en fonction à la fois de la valeur d’estimation de la voie de transmission du signal désiré et d'un signal connu, un signal réplique du signal désiré, une partie de soustraction de réplique (301) qui fournit, en guise de signal de suppression de la réplique du signal désiré, une sortie de soustraction obtenue en soustrayant le signal de réplique du signal désiré du signal reçu.
PCT/JP2005/003287 2005-02-28 2005-02-28 Appareil de reception WO2006092830A1 (fr)

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JP2007505751A JPWO2006092830A1 (ja) 2005-02-28 2005-02-28 受信装置

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JP2012109951A (ja) * 2010-10-22 2012-06-07 Nippon Hoso Kyokai <Nhk> 混信波抽出装置
JP2014511638A (ja) * 2011-03-01 2014-05-15 クゥアルコム・インコーポレイテッド 基準信号干渉除去のためのチャネル推定
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JP2011529280A (ja) * 2008-06-02 2011-12-01 サムスン エレクトロニクス カンパニー リミテッド 知られた信号に基づき干渉を認知する認知無線通信装置、方法、及び記録媒体
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JP2014511638A (ja) * 2011-03-01 2014-05-15 クゥアルコム・インコーポレイテッド 基準信号干渉除去のためのチャネル推定
JP2018139389A (ja) * 2017-02-24 2018-09-06 日本電信電話株式会社 無線通信装置及び受信処理方法

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