WO2016114359A1 - 基地局装置および端末装置 - Google Patents
基地局装置および端末装置 Download PDFInfo
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- WO2016114359A1 WO2016114359A1 PCT/JP2016/051011 JP2016051011W WO2016114359A1 WO 2016114359 A1 WO2016114359 A1 WO 2016114359A1 JP 2016051011 W JP2016051011 W JP 2016051011W WO 2016114359 A1 WO2016114359 A1 WO 2016114359A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
- H04W52/262—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account adaptive modulation and coding [AMC] scheme
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0215—Traffic management, e.g. flow control or congestion control based on user or device properties, e.g. MTC-capable devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0012—Modulated-carrier systems arrangements for identifying the type of modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
Definitions
- the present invention relates to a base station device and a terminal device.
- the wireless traffic is increasing rapidly due to the recent spread of smartphones and tablet terminals.
- Research and development of the fifth generation mobile communication system (5G) is being carried out to cope with the rapidly increasing traffic.
- OFDMA Orthogonal Frequency Frequency Division Multiple Multiple Access
- 5G access technologies Non-orthogonal multi-access transmits a signal having no orthogonality on the assumption that reception processing such as interference canceller or maximum likelihood estimation is performed at the receiver.
- DL-NOMA Downlink ⁇ ⁇ ⁇ Non-Orthogonal Multiple Access
- a base station device eNB (evolved Node B), also referred to as a base station
- UE User Equipment
- the transmission power allocated to each modulation symbol is determined in consideration of reception power (reception quality) in the multiplexed terminal apparatus, MCS (Modulation and Coding Scheme, modulation scheme and coding rate), and the like.
- a terminal device decodes signals destined for other terminal devices out of multiplexed transmission signals, generates a replica of the signal destined for other terminal devices, and cancels the received signal to extract only the modulation symbols destined for the terminal itself can do.
- the present invention has been made in view of such circumstances, and an object of the present invention is to provide a DL-NOMA system capable of improving the performance of DL-NOMA without increasing control information. is there.
- a terminal device and a base station device according to the present invention for solving the above-described problems are as follows.
- the base station apparatus considers a first modulation symbol generation unit that generates a first modulation symbol and a bit sequence that constitutes the first modulation symbol, and generates a second modulation symbol.
- a second modulation symbol generation unit to generate, a power allocation unit that allocates different transmission power to the first modulation symbol and the second modulation symbol, the first modulation symbol, and the second modulation symbol.
- a signal adding unit for adding is provided.
- the power allocation unit allocates higher power to the second modulation symbol than to the first modulation symbol.
- the first modulation symbol generation unit performs modulation of a multi-value number or more of the second modulation symbol.
- the first modulation symbol generation unit divides a constituent bit sequence of the second modulation symbol into two, and exclusive logic of the divided bit sequence It is characterized by changing the labeling by sum.
- the first modulation symbol generation unit changes the labeling of the in-phase axis by exclusive OR of the first half of the divided bit series, and the division The orthogonal axis labeling is changed by exclusive OR of the latter half of the bit sequences.
- the labeling change is achieved by switching between positive and negative.
- the terminal device of the present invention includes a reception antenna that receives a signal obtained by adding the first modulation symbol and the second modulation symbol, and a demodulation processing unit that performs a demodulation process on the added signal.
- the first modulation symbol is changed in labeling by a constituent bit sequence of the second modulation symbol, and the demodulation processing unit performs demodulation processing in consideration of the changed labeling. .
- the performance of DL-NOMA can be improved without increasing the amount of control information, the cell throughput or user throughput can be improved.
- the communication system in the present embodiment includes at least one base station device (transmitting device, cell, transmission point, transmitting antenna group, transmitting antenna port group, component carrier, evolved Node B (eNB)) and a plurality of terminal devices (terminal, Mobile terminal, reception point, reception terminal, reception device, reception antenna group, reception antenna port group, User Equipment (UE)).
- base station device transmitting device, cell, transmission point, transmitting antenna group, transmitting antenna port group, component carrier, evolved Node B (eNB)
- terminal devices terminal, Mobile terminal, reception point, reception terminal, reception device, reception antenna group, reception antenna port group, User Equipment (UE)
- FIG. 1 is a schematic diagram showing an example of a downlink (forward link) of a cellular system according to the first embodiment of the present invention.
- a base station apparatus eNB
- Base station apparatus 101 multiplexes signals destined for terminal apparatus 102 and terminal apparatus 103, and transmits them on the same subcarrier.
- FIG. 2 is a block diagram showing an example of a transmitter configuration of a conventional base station apparatus 101 that performs DL-NOMA.
- the number of multiplexed signals is two.
- the information bits are input to the encoding unit 201-1 and the encoding unit 201-2, and error correction encoding is applied. Note that which coding rate is used in error correction coding is determined by, for example, information on MCS input from the scheduling unit 206.
- the encoding units 201-1 and 201-2 may perform processing capable of improving the effect of error correction such as bit interleaving.
- the error correction coded bits are input to modulation section 202-1 and modulation section 202-2, respectively, and processing for converting the bit sequence into a modulation symbol sequence is performed.
- the generated modulation symbols are QPSK (QuadraturerPhase Shift Keying), 16QAM (Quadrature Amplitude Modulation), 64QAM, and the like, even if different modulation schemes are used in the modulation unit 202-1 and the modulation unit 202-2. Good.
- which modulation method is used is determined by, for example, information on MCS input from the scheduling unit 206.
- the modulation scheme applied by modulation section 202-1 is 16QAM
- one of the modulation symbol candidate points shown in FIG. 3 is transmitted according to the transmission bit sequence.
- the numbers attached to the signal candidate points in FIG. 3 indicate the bit sequences for constituting the signal candidate points.
- the I axis represents the in-phase component and the Q axis represents the quadrature component.
- the modulation scheme applied by modulation section 202-2 is QPSK
- any one of the modulation symbol candidate points shown in FIG. 4 is transmitted.
- the information regarding MCS of each terminal apparatus is notified to each terminal apparatus through a control information channel.
- the outputs of modulation section 202-1 and modulation section 202-2 are input to power allocation section 203-1 and power allocation section 203-2, respectively.
- the power allocation unit 203-1 and the power allocation unit 203-2 perform power allocation so that the total value of the average power output from the modulation unit 202-1 and the modulation unit 202-2 becomes a predetermined value.
- This power allocation is determined in advance or determined by the scheduling unit 206 in consideration of the cell throughput or the user throughput, and is performed based on values input to the power allocation unit 203-1 and the power allocation unit 203-2.
- the outputs of power allocation unit 203-1 and power allocation unit 203-2 are input to resource allocation units 204-1 and 204-2, respectively.
- signals input from power allocating unit 203-1 and power allocating unit 203-2 are respectively transmitted in accordance with allocation information input from scheduling unit 206. Place on subcarrier.
- the scheduling unit 206 determines resource allocation so that the resource allocation units 204-1 and 204-2 use different resources. For example, resources are allocated to each terminal device as shown in FIG. That is, the resources used by resource allocation units 204-1 and 204-2 do not overlap each other.
- the resource allocation units 204-1 and 204-2 perform the same resource allocation. For example, resources are allocated to each terminal device as shown in FIG. As a result, signals output from the power allocation unit 203-1 and the power allocation unit 203-2 are transmitted while sharing the same radio resource.
- the resource allocating unit 204-1 and the resource allocating unit 204-2 are not limited to completely the same resource or resources that do not overlap each other, for example, as shown in FIG. As described above, resources are allocated to each terminal device. That is, according to the present embodiment, it is possible to allocate resources so that some of the allocated resources overlap. The reason why such resource allocation can be performed will be described later.
- power allocation in power allocation section 203-1 and power allocation section 203-2 as shown in FIG. 6 (a) and FIG. 6 (b), a plurality of subcarriers used for signals addressed to each terminal apparatus are used. The same power may be allocated to all of them, or the power may be changed for each subcarrier depending on whether or not non-orthogonal multiplexing is performed or the number of non-orthogonal multiplexing.
- the outputs of the resource allocation unit 204-1 and the resource allocation unit 204-2 are input to the signal addition unit 205.
- the signal addition unit 205 adds (synthesizes, superposition coding) the outputs of the resource allocation unit 204-1 and the resource allocation unit 204-2 for each subcarrier.
- superposition superposition supercoding
- the signal addition unit 205 may select any of the signal point arrangements as shown in FIG.
- the output of the signal adding unit 205 is input to the control information multiplexing unit 207.
- the control information multiplexing unit 207 processing for multiplexing control information necessary for reception processing in the terminal device is applied.
- the control information includes MCS and allocation information.
- the output of the control information multiplexing unit 207 is input to the OFDM signal generation unit 208.
- the configuration of the OFDM signal generator 208 is shown in FIG. As shown in FIG. 8, the output of the control information multiplexing unit 207 is input to the IFFT unit 801, and conversion from a frequency domain signal to a time domain signal is performed by IFFT (Inverse Fast Fourier Transform).
- IFFT Inverse Fast Fourier Transform
- the output of IFFT section 801 is input to CP adding section 802, and CP (Cyclic Prefix) is added to obtain resistance to delayed waves.
- the output of the CP adding unit 802 is input to the wireless transmission unit 803, and processing such as D / A (Digital-to-Analog) conversion, band-limiting filtering, and up-conversion is applied.
- the output of the wireless transmission unit 803 is transmitted from the transmission antenna 209 of FIG. 2 as the output of the OFDM signal generation unit 208.
- FIG. 9 shows a conventional example of the receiver configuration of the terminal apparatus 102 that receives a signal subjected to DL-NOMA.
- a signal received via the reception antenna 900 is input to the OFDM reception signal processing unit 901.
- An example of the configuration of the OFDM reception signal processing unit 901 is shown in FIG.
- a signal received by the reception antenna 900 is input to the wireless reception unit 1001 and subjected to processing such as down-conversion, filtering, and A / D conversion.
- the output of the radio reception unit 1001 is input to the CP removal unit 1002, and the CP inserted on the transmission side is removed.
- the output of the CP removing unit 1002 is input to the FFT unit 1003, and conversion from a time domain signal to a frequency domain signal is performed by the FFT.
- the output of the FFT unit 1003 is input to the control information separation unit 902 in FIG.
- the control information separation unit 902 separates control information from the received signal.
- the obtained control information (MCS, allocation information, etc.) is used for subsequent reception processing.
- Signals other than the control information are input to the resource extraction unit 903.
- the resource extraction unit 903 extracts a resource (subcarrier) in which a signal addressed to the terminal apparatus 102 is arranged. Note that information necessary for resource extraction is included in control information obtained by the control information separator and control information notified separately from an upper layer.
- the output of the resource extraction unit 903 is input to the channel compensation unit 904.
- the channel compensation unit 904 performs channel estimation by using DMRS (Demodulation Reference Signal) or CRS (Cell-specific Reference Signal) transmitted together with the data signal from the base station apparatus, and uses the obtained channel estimation value to determine the propagation path. Compensate for the effect of (channel).
- the output of the channel compensation unit 904 is input to the demodulation unit 905 and the cancellation unit 906.
- the demodulator 905 performs demodulation using the modulation scheme used in the terminal 101. As described above, the terminal device 102 is notified of the MCS of the terminal device 103.
- the output of the demodulation unit 905 is input to the decoding unit 907, and decoding is performed based on the information regarding the MCS of the terminal device 103.
- the information bit sequence addressed to the terminal device 103 obtained by decoding is input to the encoding unit 908 and re-encoded.
- the coding rate is determined based on information related to the MCS of the terminal device 103. That is, the encoding unit 908 performs the same processing as the encoding unit 201-1 in FIG.
- the output of the encoding unit 908 is input to the modulation unit 909, and modulation is performed based on information related to MCS of the signal addressed to the terminal apparatus 103.
- the modulation unit 909 performs the same processing as the modulation unit 202-2 in FIG.
- the output of modulation section 909 is input to power allocation section 910.
- the control value in the power allocation unit 910 may be notified from the base station apparatus 101 or may be estimated from a reference signal such as DMRS or CRS.
- the output of the power allocation unit 910 is input to the cancellation unit 906.
- the cancellation unit 906 subtracts (cancels) the signal addressed to the terminal device 103 output from the power allocation unit 910 from the signal input from the channel compensation unit 904, thereby obtaining a modulation symbol addressed to the terminal device 102.
- the output of the cancel unit 906 is input to the demodulator 911 and demodulated based on the MCS of the terminal device 102. By applying error correction decoding to the output of the demodulation unit 911 by the decoding unit 912, an information bit sequence addressed to the terminal apparatus 102 is obtained.
- the MCS used for communication by the other terminal device is notified from the base station device. Need to be done.
- the types of MCS are limited, it may be possible to try all the MCSs of other terminal devices, but considering the decoding process, the amount of calculation becomes enormous and not realistic.
- a receiver configuration is used in which maximum likelihood detection (MLD: “Maximum” Likelihood Detection) is used for signal separation in the receiver, and signals destined for other terminals are not decoded.
- FIG. 11 shows an example of a receiver configuration in this embodiment. The processing until obtaining the output of the resource allocation unit 1104 is the same as that in FIG.
- the maximum likelihood detection unit 1105 first compensates for the influence of the propagation path.
- a reference signal such as the above-mentioned CRS or DMRS
- channel estimation is performed by estimating the propagation path by reception, and the obtained channel Propagation path compensation is performed based on the estimated value.
- the maximum likelihood detection unit 1105 transmits candidate point '1011' having the shortest distance from the received signal point among the candidate points. As a result, the subsequent signal processing is performed.
- the control information may be notified in a frame (subframe) in which the data transmission is performed, or may be notified in advance by an upper layer (for example, RRC (Radio Resource Control)).
- RRC Radio Resource Control
- the hard decision that “1110”, which is the point closest to the received signal point, has been transmitted, but soft decision is performed on each bit, and the bit LLR (Log Likelihood Ratio) and the like are set.
- the present embodiment since it is not necessary to decode a signal addressed to another terminal by using MLD for signal detection of the receiver, resource allocation of terminal devices participating in non-orthogonal multi-access is performed. It is possible to decode a signal addressed to the own station without notifying the same restriction, MCS of the signal addressed to another terminal, and allocation information. That is, non-orthogonal multiplexing can be performed independently of the assignment of other terminals without significantly increasing the control information. As a result, it is possible to cope with an increase in the number of terminals that perform non-orthogonal multi-access, and each terminal can perform transmission by appropriate resource allocation, so that throughput can be increased.
- FIG. 14 shows a transmitter configuration in the present embodiment. 14 has substantially the same configuration as that of FIG. 2, except that the modulation unit 202-1 and the modulation unit 202-2 are a modulation symbol generation unit 1402-1 and a modulation symbol generation unit 1402-2.
- the modulation symbol generation unit 1402-1 and the modulation symbol generation unit 1402-2 will be described.
- the signal point candidates output by the signal adder 1405 are as shown in FIG. It becomes like this.
- the modulation symbol generation unit 1402-1 uses the bit sequence to perform mapping in the modulation symbol generation unit 1402-1. Or change the labeling.
- the modulation symbol generator 1402-1 conventionally performs fixed mapping regardless of the bit sequence input to the modulation symbol generator 1402-2, but the modulation symbol generator 1402-1 of the present embodiment. Then, the mapping is changed according to a signal addressed to another signal. In FIG.
- modulation symbol generation section 1402-1 and modulation symbol generation section 1402-2 are symmetrical with respect to the I axis and the Q axis with respect to the arrangement of 16QAM in the first quadrant, after the non-orthogonal multiplexed signal In this way, labeling is performed on each signal point. As a result, the power difference between signals to be subjected to non-orthogonal multiplexing is reduced, and in the case of the configuration as shown in FIG. 14, adjacent signal candidate points can be regarded as the same signal point for a terminal device to which 16QAM is transmitted. Therefore, bit errors and symbol errors can be made difficult to occur.
- Modulation symbol generation section 1402-1 changes the mapping based on the bit sequence constituting the modulation symbol in modulation symbol generation section 1402-2. Specifically, in the bit sequence constituting the modulation symbol output from the modulation symbol generator 1402-2, odd-numbered bits (in the case of a modulation symbol consisting of 6 bits, the first, third, and fifth) The exclusive OR is calculated, and in the case of 0, the modulation symbol generator 1402-1 performs the same processing as the conventional modulator (modulator 202-1 in FIG. 2).
- the even bit and the odd bit are described. This is because QAM (QPSK, 16QAM, 64QAM) labeling used in LTE is assumed, and labeling different from LTE is performed. In some cases, it is not always appropriate to divide into odd bits and even bits, but the bit sequence is divided into the first half and the second half, and the positive or negative of the I axis and the Q axis is determined by the exclusive OR of each, etc. Determine the criteria for sign reversal.
- QAM QPSK, 16QAM, 64QAM
- the above modulation method can be applied not only to QAM but also to BPSK. Since BPSK (Binary Phase Shift Shift Keying) does not have a quadrature component (Q-axis value), the in-phase component (I-axis value) is used. The above method only has to be applied.
- BPSK Binary Phase Shift Shift Keying
- I-axis value the in-phase component
- transmission signal candidate points as shown in FIG. 15 are determined by the modulation method used for the signal addressed to the own station and the modulation method used for the signal addressed to the other station and the power difference between them.
- the candidate point that is generated and has the shortest distance from the reception signal point is calculated as the transmission signal point. This is an example of a case where a hard decision is made, but as in the first embodiment, a soft decision may be made and the bit LLR may be calculated.
- adjacent signal points are the same signal point for the own station. Therefore, the probability of erroneous determination due to noise or interference can be reduced.
- mapping method Gray coding
- adjacent bits are signal points different by 1 bit
- adjacent signal points are signal points different by 2 bits.
- the modulation symbol generator By performing the above process, it is possible to arrange only one bit different from the signal point adjacent to the adjacent signal point, so that the bit error rate can be lowered. That is, the bit error rate can be reduced even when relatively large noise occurs.
- maximum likelihood detection is performed as processing in the receiver.
- the detection method is not limited to maximum likelihood detection, and any method is effective.
- a symbol level interference canceller or codeword level interference canceller is also effective when a replica is generated based on a soft decision result.
- the program that operates in the base station apparatus and the terminal apparatus according to the present invention is a program (a program that causes a computer to function) that controls the CPU and the like so as to realize the functions of the above-described embodiments according to the present invention.
- Information handled by these devices is temporarily stored in the RAM at the time of processing, then stored in various ROMs and HDDs, read out by the CPU as necessary, and corrected and written.
- a recording medium for storing the program a semiconductor medium (for example, ROM, nonvolatile memory card, etc.), an optical recording medium (for example, DVD, MO, MD, CD, BD, etc.), a magnetic recording medium (for example, magnetic tape, Any of a flexible disk etc. may be sufficient.
- the processing is performed in cooperation with the operating system or other application programs.
- the functions of the invention may be realized.
- the program when distributing to the market, can be stored in a portable recording medium for distribution, or transferred to a server computer connected via a network such as the Internet.
- the storage device of the server computer is also included in the present invention.
- Each functional block of the receiving apparatus may be individually formed as a chip, or a part or all of them may be integrated into a chip. When each functional block is integrated, an integrated circuit controller for controlling them is added.
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
- an integrated circuit based on the technology can also be used.
- the terminal device of the present invention is not limited to application to a mobile station device, but is a stationary or non-movable electronic device installed indoors or outdoors, such as AV equipment, kitchen equipment, cleaning / washing equipment Needless to say, it can be applied to air conditioning equipment, office equipment, vending machines, and other daily life equipment.
- the present invention is suitable for use in a terminal device, a base station device, a communication system, and a communication method.
- Base station apparatus 102 103 Terminal apparatus 201-1 to 201-2 Encoding section 202-1 to 202-2 Modulation section 203-1 to 202-2 Power allocation section 204-1 to 204-2 Resource allocation section 205 Signal Adder 206 Scheduling unit 207 Control information multiplexing unit 208 OFDM signal generation unit 209 Transmission antenna 801 IFFT unit 802 CP addition unit 803 Wireless transmission unit 900 Reception antenna 901 OFDM reception signal processing unit 902 Control information separation unit 903 Resource extraction unit 904 Channel compensation Unit 905 demodulation unit 906 cancellation unit 907 decoding unit 908 encoding unit 909 modulation unit 910 power allocation unit 911 demodulation unit 912 decoding unit 1001 wireless reception unit 1002 CP removal unit 1003 FFT unit 1101 reception antenna 1102 OFDM reception signal processing unit 1103 control information Separation section 1104 Resource extraction section 1105 Maximum likelihood detection section 1106 Decoding sections 1401-1 to 1401-2 Encoding sections 1402-1 to 1402-2 Modulation symbol generation sections 1403-1 to 1403-2 Power allocation sections 1404-1 to 1404 -2 Resource allocation unit
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Abstract
Description
本実施形態における通信システムは、少なくとも1つの基地局装置(送信装置、セル、送信点、送信アンテナ群、送信アンテナポート群、コンポーネントキャリア、evolved Node B(eNB))および複数の端末装置(端末、移動端末、受信点、受信端末、受信装置、受信アンテナ群、受信アンテナポート群、User Equipment(UE))を備える。
第1の実施形態において、MLD(最尤検出)を用いることでリソース割り当てを柔軟に行えるようになることを示した。MLDを用いることで非直交多重を行った場合においても、他端末宛ての信号の復号を行わずに自局宛ての信号を復号することができる。しかしながら、非直交多重を行う複数端末に対する電力割り当てにおいて電力差が大きい場合、図7のように、他局宛ての信号の送信ビットが異なることによる信号点間距離は、自局宛ての送信ビットが異なることによる信号点間距離に比べて長くなる。つまり、非直交多重による影響は比較的受けにくく、自局宛ての信号検出を行うことができる。しかしながら、非直交多重を行う複数端末に対する電力割り当てにおいて電力差が小さい場合、図13のように、他局宛ての信号の送信ビットが異なることによる信号点間距離は、自局宛ての送信ビットが異なることによる信号点間距離に比べて短くなる。つまり、非直交多重による影響が支配的になり、自局宛ての信号検出を行うことができなくなる。
102、103 端末装置
201-1~201-2 符号化部
202-1~202-2 変調部
203-1~203-2 電力割当部
204-1~204-2 リソース割当部
205 信号加算部
206 スケジューリング部
207 制御情報多重部
208 OFDM信号生成部
209 送信アンテナ
801 IFFT部
802 CP付加部
803 無線送信部
900 受信アンテナ
901 OFDM受信信号処理部
902 制御情報分離部
903 リソース抽出部
904 チャネル補償部
905 復調部
906 キャンセル部
907 復号部
908 符号化部
909 変調部
910 電力割当部
911 復調部
912 復号部
1001 無線受信部
1002 CP除去部
1003 FFT部
1101 受信アンテナ
1102 OFDM受信信号処理部
1103 制御情報分離部
1104 リソース抽出部
1105 最尤検出部
1106 復号部
1401-1~1401-2 符号化部
1402-1~1402-2 変調シンボル生成部
1403-1~1403-2 電力割当部
1404-1~1404-2 リソース割当部
1405 信号加算部
1406 スケジューリング部
1407 制御情報多重部
1408 OFDM信号生成部
1409 送信アンテナ
Claims (7)
- 第1の変調シンボルを生成する第1の変調シンボル生成部と、
前記第1の変調シンボルを構成するビット系列を考慮して、第2の変調シンボルを生成する第2の変調シンボル生成部と、
前記前記第1の変調シンボルと前記第2の変調シンボルに異なる送信電力を割り当てる電力割当部と、
前記第1の変調シンボルと前記第2の変調シンボルを加算する信号加算部を備えることを特徴とする基地局装置。 - 前記電力割当部は、第1の変調シンボルよりも第2の変調シンボルに高い電力を割り当てることを特徴とする請求項1記載の基地局装置。
- 前記第1の変調シンボル生成部は、第2の変調シンボルの多値数以上の変調を行うことを特徴とする請求項1または2記載の基地局装置。
- 前記第1の変調シンボル生成部は、前記第2の変調シンボルの構成ビット系列を2つに分割し、該分割されたビット系列の排他的論理和によってラベリングを変更することを特徴とする請求項1記載の基地局装置。
- 前記第1の変調シンボル生成部は、前記分割されたビット系列のうち前半のビット系列排他的論理和によって同相軸のラベリングを変更し、前記分割されたビット系列のうち後半のビット系列排他的論理和によって、直交軸のラベリングを変更することを特徴とする請求項4記載の基地局装置。
- 前記ラベリングの変更は、正負を入れ替えることによって達成されることを特徴とする請求項5記載の基地局装置。
- 第1の変調シンボルと第2の変調シンボルが加算された信号を受信する受信アンテナと、前記加算された信号に対して復調処理を行う復調処理部を備える端末装置であって、
前記第1の変調シンボルは、第2の変調シンボルの構成ビット系列によってラベリングが変更され、
前記復調処理部は、前記変更されたラベリングを考慮して復調処理を行うことを端末装置。
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