WO2006098387A1 - マルチアンテナ無線通信システムに用いられる伝送方法および伝送装置 - Google Patents
マルチアンテナ無線通信システムに用いられる伝送方法および伝送装置 Download PDFInfo
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- WO2006098387A1 WO2006098387A1 PCT/JP2006/305173 JP2006305173W WO2006098387A1 WO 2006098387 A1 WO2006098387 A1 WO 2006098387A1 JP 2006305173 W JP2006305173 W JP 2006305173W WO 2006098387 A1 WO2006098387 A1 WO 2006098387A1
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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
- H04W52/38—TPC being performed in particular situations
- H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
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- 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
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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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
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
- H04L5/0046—Determination of how many bits are transmitted on different sub-channels
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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
- H04L5/0058—Allocation criteria
- H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
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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
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
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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
- H04L5/0037—Inter-user or inter-terminal allocation
Definitions
- the present invention relates to an adaptive transmission method and transmission apparatus in a wireless communication system, and more particularly to a transmission method and transmission apparatus that are used in a multi-antenna wireless communication system and can reduce the amount of processing computation.
- MIMO-OFDM technology which combines multi-antenna input 'multi-ante output (MIM O) and orthogonal frequency multiplexing (OFDM), is attracting more and more people.
- the transmitting side transmits signals using a plurality of transmitting antennas
- the receiving side receives signals using a plurality of receiving antennas.
- MIMO technology significantly improves the channel capacity and can improve the information transmission rate.
- the more transmission and reception antennas that are used the higher the information transmission rate.
- spatial domain antenna resources can be used almost infinitely, so MIMO technology has overcome the bottleneck in the resource shortage problem of conventional technology, and is one of the core technologies of next-generation wireless communication systems. It has become.
- OFDM technology is currently one of the mainstream technologies for realizing high-speed wireless data transmission.
- the principle of OFDM technology is that the transmission rate on each subcarrier is relatively low because high-speed data to be transmitted is transmitted using multiple orthogonal subcarriers.
- the OFDM subcarrier orthogonal multiplexing technique can further improve the frequency utilization efficiency of the system compared to a normal frequency multiplexing system.
- the frequency band of the entire signal is divided into several very narrow subcarrier frequency bands. It becomes flat fading because it is divided into areas. Therefore, it is easier to achieve the balance in the OFDM system than in the single carrier system.
- the information transmission rate in the attenuation channel can be effectively improved by the adaptive transmission technique.
- Adaptive modulation and coding (AMC) technology is one of the important adaptive transmission technologies, and its basic idea is to adaptively change modulation parameters, coding parameters, and transmission power used for transmission based on channel characteristics. It is to be. When channel conditions are better, more information is transmitted, and when channel conditions are worse, less information is transmitted to improve system performance. Thus, adaptive transmission techniques can achieve higher information transmission rates, lower error bit rates (BER), and lower transmission power.
- BER error bit rates
- MIMO-OFDM-AMC a wireless communication system that applies two technologies, Ml MO OFDM and AMC, is called a MIMO-OF DM-AMC system.
- the number of data substreams configured by a plurality of subcarriers in the frequency domain corresponding to each transmit antenna in the spatial domain greatly increases.
- the number of data substreams is N * n. Therefore, Ml
- an object of the present invention is to provide a transmission method and a transmission apparatus that optimize transmission bit and transmission power allocation for each data substream with a low processing complexity in a MIMO-OFDM-AMC system. That is.
- the transmission method of the present invention is a transmission method used in a multi-antenna wireless communication system, detects each data substream, and calculates a signal-to-interference noise ratio (SINR) gain for each data substream. Based on the SINR calculation step to be performed and the obtained SINR gain A spatial domain allocation step for determining transmission bit and transmission power allocation parameters by performing transmission bit and transmission power allocation optimization in the spatial domain for all data substreams on one subcarrier in the frequency domain; The transmission bit and transmission power for adjacent subcarriers are sequentially used by sequentially using the transmission bit and transmission power distribution parameter allocated on the certain one subcarrier for which the transmission bit and transmission partition allocation parameters are determined. And an allocation step on adjacent subcarriers for performing allocation optimization.
- SINR signal-to-interference noise ratio
- the transmission apparatus of the present invention uses SINR gain calculating means for detecting each adaptively transmitted data substream using the channel estimation matrix H and calculating a SINR gain for each data substream. Based on the SINR gain, transmission bit and transmission power distribution optimization is performed in the spatial domain for all data substreams on one subcarrier in the frequency domain, and transmission bit and transmission power distribution parameters are determined. The transmission bit and transmission power distribution optimization means to be transmitted and the transmission bit and transmission power distribution parameter allocated on the one subcarrier for which the transmission bit and transmission power distribution parameter are determined are sequentially used. Adjacent subcarriers that optimize transmission bit and transmission power distribution for subcarriers adjacent to one subcarrier A transmission bit and transmission power optimization unit is a heat transmission device for use in a multi-antenna radio communication system comprising a.
- transmission bits and transmission are simply performed in a spatial domain.
- the number of field dimensions used for transmission bit and transmission power distribution can be reduced, and the amount of processing calculations can be reduced compared to conventional methods.
- the algorithm of transmission bit and transmission power distribution can be further simplified by using the correlation of channel characteristics on adjacent subcarriers.
- FIG. 1 is a block diagram showing a configuration of a MIMO-OFDM system (MIMO-OFDM-AMC system) using AMC technology according to an embodiment of the present invention.
- FIG. 3 is a block diagram showing a detailed configuration of an adaptive modulation and coding (AMC) parameter selection Z transmission node allocation unit according to an embodiment of the present invention.
- AMC adaptive modulation and coding
- FIG. 4 is a flowchart showing a procedure of a transmission bit Z transmission power distribution method according to an embodiment of the present invention.
- FIG.5 Block diagram showing detailed configuration of AMC parameter selection Z transmission power distribution unit that optimizes transmission bit and transmission power distribution simultaneously in both frequency domain and spatial domain
- FIG. 6 Flow chart showing the procedure for optimizing transmission bit and transmission power allocation using the Greedy algorithm.
- FIG. 1 is a block diagram showing a configuration of a MIMO-OFDM (MI MO-OFDM-AMC) system 100 that uses the AMC technique according to an embodiment of the present invention.
- MI MO-OFDM-AMC MIMO-OFDM
- the MIMO-OFDM-AMC system 100 includes n transmit antennas.
- Radio transmission device 150 that performs transmission using and n reception antennas for reception.
- Radio transmitting apparatus 150 includes serial Z parallel (SZP) conversion section 101, adaptive modulation and coding (AMC) sections 102-l to 102-n, and transmission power control section 103.
- SZP serial Z parallel
- AMC adaptive modulation and coding
- Wireless receiver 160 includes receiving antennas 109-1 to 109-n, pre-circular spelling (CP) removal.
- CP pre-circular spelling
- FFT Conversion
- PZS Parallel Z-Direction
- a channel estimation unit 114 an AMC parameter selection Z transmission power distribution unit 115, and a MIMO detection unit 116 are provided.
- a plurality of similar components indicated by using the same branch number may be abbreviated by omitting the branch number.
- the adaptive modulation and coding (AMC) units 102-1 to 102-n may be abbreviated as the adaptive modulation and coding (AMC) unit 102 in some cases.
- serial Z parallel (SZP) conversion section 101 divides frequency domain data Tx Data to be transmitted into ⁇ data substreams and outputs the data substreams to each AMC section 102.
- Each data substream corresponds to one transmit antenna 108.
- Each adaptive modulation and coding section 102 performs adaptive modulation and coding on each data sub-stream input from the serial Z parallel (SZP) conversion section 101 based on channel transmission characteristics, and sends it to each transmission power control section 103. Output.
- Each transmission power control section 103 controls transmission power for each data substream subjected to adaptive modulation coding, and outputs the data substream to each direct Z-parallel (SZP) conversion section 104.
- each pre-cyclic spelling (CP) insertion unit 107 performs a process of inserting the pre-cyclic spelling for each time domain signal input from each parallel Z-straight (PZS) conversion unit 106, and the pre-cyclic spelling is inserted.
- Each time domain signal thus transmitted is transmitted by the corresponding transmitting antenna 108.
- wireless transmission apparatus 150 adaptive transmission parameters necessary for performing AMC operation and transmission power control operation on each data substream, for example, adaptive modulation and coding (AMC) parameter M, transmission power distribution parameter P are determined by the wireless receiver 160 and fed back through the feedback channel 117.
- Radio transmitting apparatus 150 controls the length of each data substream output from serial Z parallel (SZP) conversion section 101 based on AMC parameter M fed back by radio receiving apparatus 160.
- SZP serial Z parallel
- radio receiving apparatus 160 first, n receiving antennas 109 receive spatially multiplexed signals.
- the pre-circular spelling (CP) removal unit 110 performs a process of removing cp for each signal received by each receiving antenna 109.
- the direct-Z parallel (SZP) conversion unit 111, the fast Fourier transform (FFT) unit 112, and the parallel-Z direct (PZS) conversion unit 113 are further input to the time domain input from the pre-cyclic spelling (CP) removal unit 110. Convert the signal to a frequency domain signal.
- the channel estimation unit 114 performs channel estimation (transfer function) based on the pilot signal of the frequency domain signal input from the parallel Z-serial (PZS) conversion unit 113 or using another method. Get the matrix H.
- select AMC parameters Z transmission power distribution section 115 determines AMC parameter M and transmission power distribution parameter P for each data substream used for adaptive transmission of radio transmission apparatus 150 based on channel estimation matrix H, and uses feedback channel 117. Then, it feeds back to the wireless transmission device 150.
- MIMO detection section 116 based on channel estimation matrix H and adaptive modulation and coding parameter M and transmission power distribution parameter P for each data substream input from AM C parameter selection Z transmission power distribution section 115, Each data substream transmitted by the transmission device 150 is detected, and the original transmission data is obtained and used as reception data (Rx Data).
- MIMO detection section 116 first separates each signal transmitted from each transmission antenna 108 of radio transmission apparatus 150 by the detection method as described above, and demodulates and decodes each obtained signal.
- ZF Zero Forcing
- MMSE Minimum Mean Square Error
- transmission bit allocation and transmission power allocation in the MIMO-OFDM-AMC system 100 having the above-described configuration will be described.
- the distribution of transmission bits is equivalent to the selection of AMC parameter M (ie, the number of transmission bits and AMC parameters correspond one-to-one, and they can be regarded as equivalent).
- the allocation parameter is written as M.
- FIG. 2 is a diagram for explaining the concept of adaptive transmission in MIMO-OFDM-AMC system 100 according to the present embodiment.
- each subcarrier 1 to N indicates the concept of frequency domain, and each transmitting antenna
- MO—OFDM—AMC system 100 indicates a data substream (or adaptive transmission unit) in which the c-th subcarrier signal is transmitted by the j-th transmission antenna 108-j.
- Figure 2 The transmission bit and transmission power allocation performed for each data substream is actually equivalent to the selection of AMC parameters and the transmission parameter allocation for each data substream.
- MO- OFDM- AMC shows a channel estimation matrix on the c-th subcarrier of the system 100, the i-th row of H c, element H c (i, j) of the j-th column is first of MIMO- OFDM- AMC system 100
- the frequency domain channel gain when the c-th subcarrier signal is transmitted by the j-th transmitting antenna 108 and received by the first receiving antenna 109 is shown.
- FIG. 3 is a block diagram showing a detailed configuration of AMC parameter selection / transmission power distribution section 115 according to the present embodiment.
- AMC parameter selection Z transmission power distribution section 115 includes signal-to-interference noise ratio (SINR) gain calculation section 301, transmission bit Z transmission power distribution optimization section 502, and adjacent subcarrier transmission bit Z transmission.
- SINR signal-to-interference noise ratio
- a power distribution optimization unit 503 is provided.
- the signal-to-interference and noise ratio (SINR) gain calculation unit 301 uses the channel estimation matrix H obtained by the channel estimation unit 114 to perform a signal after MIMO detection of each data substream s in MIMO-OFDM AMC 100. Calculate the interference to noise ratio (SINR) gain G.
- SINR interference to noise ratio
- transmission bit / transmission power distribution optimization section 502 optimizes transmission bit and transmission power distribution in the spatial domain for all data substreams on one subcarrier in the frequency domain.
- the transmission bit / transmission power distribution optimization unit 502 uses an arbitrary transmission bit and transmission power distribution optimization algorithm used in conventional adaptive transmission, for example, a Greedy algorithm.
- Transmission bit Z transmission power allocation optimization unit 502 performs n data on one subcarrier in the frequency domain.
- Adaptive transmission parameters are optimized only for substreams, and the range of optimization is limited to the spatial domain.
- adjacent subcarrier transmission bit Z transmission power allocation optimization section 503 performs transmission on the subcarriers to which adaptive transmission parameters (transmission bits and transmission power allocation parameters) are allocated by transmission bit Z transmission power distribution optimization section 502.
- the adaptive transmission parameter information allocated to each is sequentially used to optimize transmission bit and transmission power distribution for the adjacent subcarriers.
- the channel characteristics on adjacent subcarriers in frequency are very close, so the adaptive transmission parameters finally allocated on the adjacent subcarriers should be very close.
- the adaptive transmission parameter allocation when the transmission bit and transmission power distribution on one subcarrier is optimized, only a minute adjustment is made to the distribution optimization result of the subcarrier.
- the adaptive transmission parameters M and P of adjacent subcarriers can be obtained.
- Adjacent subcarrier transmission bit Z transmission power allocation optimization section 503 adjusts the adaptive transmission parameter of one subcarrier obtained by transmission bit Z transmission power distribution optimization section 502, and performs frequency domain only.
- the adaptive transmission parameters for all subcarriers can be determined. Compared to the case where transmission bits and transmission power are allocated to each subcarrier in an overlapping manner, this method can greatly reduce the amount of computation processing for adaptive transmission.
- FIG. 4 is a flowchart showing a procedure of a transmission bit and transmission power distribution method in MIMO-OFDM-AMC system 100 according to the present embodiment.
- step S601 the channel estimation unit 114, the line channel estimation ,, channel estimation (transfer function) matrix H:! ! 1, H 2 , ⁇ ⁇ , obtain H Nc ⁇ .
- step S601 [KOO! /, SINR gain calculator 301 clears the set U formed by the subcarriers to which transmission bits and transmission power are already allocated.
- SINR gain calculation section 301 calculates SINR gain G of each data substream s after MIMO detection based on channel estimation matrix H and the MIMO detection method used in MIMO detection section 116.
- the magnitude of the SINR gain G depends on H, and is used in the MIMO detector 116.
- the MIMO detection method used For example, when the ZF detection method is used in the MIMO detection unit 116, the signal-to-interference noise ratio after MIMO detection is performed on the data substream s in which the c-th subcarrier signal is transmitted by the j-th transmission antenna 108-j.
- H c is MIMO-OFDM- AMC system jj jj
- transmission bit Z transmission power allocation optimization section 502 performs spatial domain processing for all data substreams on one subcarrier having a frequency domain, for example, the kth subcarrier. To optimize transmission bit and transmission power distribution, and obtain M and P. Where M and P are the data sources on the kth subcarrier k k k k k
- transmission bit Z transmission power allocation optimization section 502 uses a conventional arbitrary algorithm used for transmission bit and transmission power optimization, for example, Greedy algorithm, on the kth subcarrier in the frequency domain.
- Greedy algorithm used for transmission bit and transmission power optimization
- Transmission parameters are optimized and the range of optimization is limited to the spatial domain. Specifically, transmission bit Z transmission power allocation optimization section 502 performs n data sub-carriers on sub-carrier k.
- the AMC parameter is improved by one level (transmission bits k, 1 k, 2 k, nT
- nT T k 1 k, 2 k, nT
- Transmission bit Z transmission power allocation optimizing section 502 increases the transmission bit number of the data substream that minimizes the increase in transmission power necessary to improve the AMC parameter by one level by one. That is, transmission bit Z transmission power allocation optimization section 502 actually increases the AMC parameter of the data substream that minimizes the increase in transmission power necessary for improving the AMC parameter by one level by one level. Transmission bit Z transmission power allocation optimization section 502 repeats the above processing to transmit a predetermined number of transmissions to n data substreams on the kth subcarrier.
- step S 604 the transmission bit ⁇ ⁇ ⁇ transmission power distribution optimization unit 502 adds the k th subcarrier to the set U.
- adjacent subcarrier transmission bit Z transmission power allocation optimization section 503 sequentially uses the adaptive transmission parameter information allocated on the kth subcarrier to which the adaptive transmission parameter is allocated, and The transmission bit and transmission power allocation are optimized for the adjacent subcarriers, and the transmission bit and transmission power allocation results on all data substreams of all subcarriers other than the kth subcarrier are obtained.
- adjacent subcarrier transmission bit Z transmission power distribution optimization section 503 includes the following in the set U formed by the subcarriers to which adaptive transmission parameters are allocated: It is determined whether there is a subcarrier having a predetermined condition. That is, it is determined whether the subcarrier adjacent to the subcarrier is still allocated transmission bits and transmission power. When it is determined that such a subcarrier exists, the adjacent subcarrier transmission bit Z transmission power distribution optimization unit 503 describes the subcarrier as subcarrier 1 and the adjacent subcarrier as subcarrier 1 ′.
- step S605 if adjacent subcarrier transmission bit Z transmission power allocation optimization section 503 determines that there is no subcarrier of the predetermined condition, all of MIMO-OFDM AMC system 100 It is determined that transmission bit and transmission power allocation has been completed on N subcarriers, and the flow ends.
- step S605 adjacent subcarrier transmission bit Z transmission power distribution optimization section 503 extracts subcarrier 1 and subcarrier 1 ′ when determining that there are subcarriers of the predetermined condition.
- the purpose is to use the adaptive transmission parameters allocated on the subcarrier 1 to which the adaptive transmission parameters have already been allocated, and to allocate the adaptive transmission parameters to the adjacent subcarrier 1 'below. .
- n argmax ⁇ (S (m) —S (m-1)) / G ⁇ , ⁇ ⁇ (1)
- n argmin ⁇ (S (m + 1) —S (m)) / G ⁇ ⁇ ' ⁇ (2)
- step S609 adjacent subcarrier transmission bit Z transmission power distribution optimization section 503 compares n with n.
- step S609 If it is determined in step S609 that n is not equal to n, adjacent subcarrier transmission bit Z transmission power distribution optimization section 503 returns to step S607 to obtain data substream n again, and then step S608 Then, the data substream n is obtained again and the transmission bit allocation parameter M is continuously adjusted. In this case, data substream n and data substream n obtained in steps S607 and S608 are different from data substream n and data substream n obtained in previous steps S607 and S608. [0045] If it is determined in step S609 that n is equal to n, adjacent subcarrier transmission bit Z transmission power allocation optimization section 503 needs to continuously adjust transmission bit allocation parameter M on subcarrier 1 '. It is determined that there is a problem, and the process proceeds to step S610.
- step S610 adjacent subcarrier transmission bit Z transmission power allocation optimization section 503 finishes adjusting transmission bit allocation parameter M on subcarrier 1 'and adds to subcarrier 1' total U. Step back to step S605.
- the transmission bit allocation parameter and the transmission power allocation parameter can be obtained.
- MIMO-OFDM- AMC system 100 after transmission bits and transmission power allocation are performed in the spatial domain, the results of transmission bit and transmission power allocation in the spatial domain and subcarriers are allocated. Using the correlation of the upper channel characteristics, transmission bits and transmission power are allocated on subcarriers in the frequency domain.
- the transmission method according to the present invention simply performs transmission bit and transmission power allocation in the spatial domain to reduce the amount of processing computation, and uses the transmission bit and transmission power allocation result in the spatial domain to perform all of the frequency domain.
- the transmission method of the present invention does not perform coupling optimization in the frequency domain and the spatial domain for transmission bits and transmission power allocation, but simply performs transmission bit and transmission power allocation in the spatial domain.
- the number of dimensions of the field used for transmission bit and transmission power distribution is reduced, and the amount of processing computation can be reduced.
- the transmission bit and transmission power allocation algorithm can be further simplified by utilizing the correlation of channel characteristics on adjacent subcarriers.
- FIG. 5 is a block diagram showing a detailed configuration of the AMC parameter selection Z transmission power distribution unit 115a that simultaneously optimizes transmission bit and transmission power distribution in both the frequency domain and the spatial domain.
- AMC parameter selection Z transmission power distribution unit 11 5a shown in FIG. 5 replaces transmission bit Z transmission power distribution optimization unit 502 and adjacent subcarrier transmission bit Z transmission power optimization unit 503 with transmission bit Z transmission power distribution It is different from the AMC parameter selection Z transmission power distribution unit 115 shown in FIG.
- the AMC parameter selection Z transmission power distribution unit 115a includes two parts: a signal-to-interference noise ratio (SINR) gain calculation unit 301 and a transmission bit number Z transmission power distribution unit 302. Configured.
- SINR signal-to-interference noise ratio
- the SINR gain calculation unit 301 uses the channel estimation matrix H obtained by the channel estimation unit to perform signal-to-interference noise ratio (SINR) after MIMO detection of each data substream s in the MIMO-OFDM-AMC system. Calculate the gain G.
- SINR signal-to-interference noise ratio
- Transmission bit ⁇ transmission power distribution section 302 uses G obtained by SINR gain calculation section 301 for the number of transmission bits m and transmission power p allocated to each data substream s, and uses frequency G The coupling optimization in the domain and the spatial domain is performed, and the transmission bit allocation parameter M and the transmission power allocation parameter P are output.
- FIG. 6 is a flowchart showing a procedure of a method of optimizing transmission bits and transmission power distribution using the Greedy algorithm in AMC parameter selection Z transmission power distribution section 115a.
- transmission bit Z transmission power distribution section 302 initializes both the transmission bit number m and transmission power p allocated to each data substream s to zero.
- step S402 the transmission bit ⁇ transmission power distribution unit 302 is required for each data substream s of ⁇ * ⁇ c c A to improve the AMC parameter by one level.
- the increase in transmission power ⁇ ' is calculated according to the following equation (3).
- S (n) is the information to be transmitted in order to satisfy a predetermined bit error rate (BER) requirement.
- BER bit error rate
- step S403 the transmission bit Z transmission power distribution unit 302 compares all the values of p to obtain the minimum value p. In other words, it is necessary to transmit one more information bit using data substream s among all data substreams (equivalent to improving the AMC parameter by one level described in step S402). The amount of increase in transmission power is minimized.
- step S405 in this case, the transmission bit Z transmission power distribution unit 302 determines whether or not the system throughput has reached a predetermined target value.
- Throughput R ⁇ ⁇ (r) and all data substreams s through cjc, jc, j
- the target value of the put sum (overall average throughput value) R is compared.
- step S405 If it is determined in step S405 that R ⁇ R, transmission bit Z transmission power b
- the distribution unit 302 determines that the throughput requirement of the system is not satisfied by the transmission bit allocation, returns to step S402, and then performs transmission bit allocation.
- step S405 If it is determined in step S405 that R ⁇ R, the transmission bit allocation process is b
- each m value obtained becomes the final transmission bit allocation result (transmission bit allocation parameter) on the data substream s, and the transmission power allocation parameter p is calculated according to the following equation (4).
- step S403 transmission bit Z transmission power allocation section 302 increases AMC parameters by one level for all data substreams corresponding to all subcarriers in the frequency domain and all transmit antennas in the spatial domain. Compare the amount of increase in transmission power required for this. In simple terms, every time a bit is allocated in the algorithm, the above transmission power c T for all N * n data substreams.
- the transmission apparatus according to the present invention is a MIMO-OFDM-AMC mobile communication system. Therefore, it is possible to provide a communication terminal device, a base station device, and a mobile communication system having the same effects as described above.
- the power described with reference to an example in which the present invention is configured by nodeware can also be realized by software.
- an algorithm of the transmission bit and transmission power distribution method according to the present invention is described in a programming language, and the program is stored in a memory and executed by information processing means, whereby the transmission bit and the transmission power according to the present invention are stored. Functions similar to those of the transmission power distribution apparatus can be realized.
- the transmission method and transmission apparatus used in the multi-antenna wireless communication system according to the present invention can be applied to uses such as adaptive transmission in a MIMO-OFDM system.
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US11/908,556 US7920640B2 (en) | 2005-03-16 | 2006-03-15 | Transmission method and transmission apparatus used in multiantenna wireless communication system |
CN2006800079318A CN101138182B (zh) | 2005-03-16 | 2006-03-15 | 用于多天线输入/多天线输出正交频分复用无线通信系统的传输方法及传输装置 |
JP2007508192A JPWO2006098387A1 (ja) | 2005-03-16 | 2006-03-15 | マルチアンテナ無線通信システムに用いられる伝送方法および伝送装置 |
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CNA2005100563040A CN1835415A (zh) | 2005-03-16 | 2005-03-16 | 无线通信系统中使用的低复杂度比特和功率分配方法和装置 |
CN200510056304.0 | 2005-03-16 |
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Cited By (7)
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WO2009011126A1 (ja) * | 2007-07-18 | 2009-01-22 | Panasonic Corporation | 受信装置、送信装置及び適応伝送レート制御方法 |
JP2010512071A (ja) * | 2006-12-04 | 2010-04-15 | エヌイーシー ラボラトリーズ アメリカ インク | 条件付き入力を持つ上り回線マルチユーザofdm |
JP2011250414A (ja) * | 2010-05-28 | 2011-12-08 | Fujitsu Ltd | ビット及びパワー割当て方法、装置及び通信システム |
CN101242204B (zh) * | 2007-02-08 | 2012-01-25 | 联想(北京)有限公司 | 一种软频率复用的子载波优化方法及装置 |
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CN101138182A (zh) | 2008-03-05 |
US20090052560A1 (en) | 2009-02-26 |
US7920640B2 (en) | 2011-04-05 |
CN101138182B (zh) | 2011-05-04 |
CN1835415A (zh) | 2006-09-20 |
JPWO2006098387A1 (ja) | 2008-08-28 |
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