WO2008098442A1 - Procédé et moyen de réglage de débit et de puissance d'un sous-canal en fonction de l'espace - Google Patents

Procédé et moyen de réglage de débit et de puissance d'un sous-canal en fonction de l'espace Download PDF

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Publication number
WO2008098442A1
WO2008098442A1 PCT/CN2007/003148 CN2007003148W WO2008098442A1 WO 2008098442 A1 WO2008098442 A1 WO 2008098442A1 CN 2007003148 W CN2007003148 W CN 2007003148W WO 2008098442 A1 WO2008098442 A1 WO 2008098442A1
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WIPO (PCT)
Prior art keywords
modulation
transmitter
channel
coding
receiver
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PCT/CN2007/003148
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English (en)
Chinese (zh)
Inventor
Yunhui Liu
Xiaolin Zhang
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Beijing Lenovo Software Ltd.
Lenovo (Beijing) Limited
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Publication of WO2008098442A1 publication Critical patent/WO2008098442A1/fr

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Classifications

    • 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
    • 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
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • 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
    • 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
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0019—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach
    • 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
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025—Transmission of mode-switching indication
    • 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
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection

Definitions

  • the present invention relates to a multi-antenna wireless communication technology, and more particularly to a rate and power control method and control apparatus for a spatial sub-channel. Background technique
  • wireless link adaptation technology In order to obtain the maximum system spectrum efficiency and Communication capacity, a signal transmission technique that can be adaptively adjusted with changes in wireless channel conditions, called wireless link adaptation technology. This technology dynamically allocates radio resources, automatically adjusts the modulation and coding scheme and scheduling method, and employs a robust transmit signal processing method according to changing wireless channel conditions, with the aim of maximizing system performance, including improving spectral efficiency and system. Capacity, reducing the sensitivity of system performance to changes in wireless channels.
  • the implementation of AMC is: The receiver estimates and feeds back the channel state information (in Frequency Division Duplex (FDD) mode) or the transmitter estimates the reverse channel to obtain channel state information. (In Time Division Duplex (TDD) mode), the transmitter then selects the modulation and coding scheme for each spatial subchannel based on the channel state information.
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • the advantage of this AMC approach is that the transmitter can be optimized in conjunction with precoding, coordinated globally based on overall system capacity.
  • the disadvantages are: a. The transmitter generally cannot obtain accurate channel state information, especially in the FDD mode, the channel information error seriously reduces the performance of the AMC; b. In FDD mode, real-time feedback of a large amount of channel information needs to occupy a very high bandwidth. The more feedback information, the more bandwidth is wasted, and the spectrum efficiency is reduced. This is a major obstacle for transmitters to use channel state information for transmitter design.
  • the object of the present invention is to provide a rate and power control method and a control device for a subspace per space, which solves the problem that the prior art does not consider the unreliability of the transmitter channel state information and the dispersion of the modulation order, and achieves complexity and performance. And technical problems that are difficult to achieve balance and improve in achievability.
  • the present invention provides a rate and power control method for a spatial subchannel, which includes the following steps:
  • Step 1 The receiver determines a modulation and coding mode of each spatial subchannel according to channel state information estimated by the receiver side;
  • Step two the receiver notifies the transmitter of the selected modulation and coding mode
  • Step 3 The transmitter performs precoding according to the statistical value of the channel state information and the modulation and coding mode of each spatial subchannel.
  • step two includes:
  • Step a storing modulation coding tables recorded with various modulation and coding modes in the receiver and the transmitter, respectively;
  • Step b the receiver determines the index information according to the location of the modulation and coding mode selected by the different spatial subchannels in the modulation and coding table;
  • Step c the receiver sends the index information to the transmitter through a feedback channel
  • Step d The transmitter finds a modulation and coding mode selected by different spatial subchannels in the modulation and coding table according to the index information, and determines the number of spatial subchannels used by 9.
  • step one comprises:
  • Step A the receiver measures and estimates the signal to interference and noise ratio/signal to noise ratio of each spatial subchannel
  • Step B Compare a signal to interference and noise ratio/signal-to-noise ratio of each spatial subchannel with a set threshold, and select a corresponding modulation and coding mode for each spatial subchannel according to a modulation order corresponding to the threshold.
  • the statistical value is a mean value, a variance, and/or a correlation matrix parameter of the channel state information.
  • the statistical value is determined by: the transmitter estimates the reverse channel, utilizes a channel coherent time period or The statistical value obtained by calculating the reverse channel estimate obtained within the set time window.
  • the statistical value is determined by: the receiver utilizing a channel coherent time period or a set time window
  • the channel state information obtained therein is used to calculate the statistical value, and the statistical value is fed back to the transmitter through a feedback channel.
  • the present invention also provides a rate and power control apparatus for a spatial subchannel, comprising: a receiver, configured to determine each spatial subchannel according to channel state information estimated by the receiver side. Selecting a modulation coding mode, and notifying the transmitter of the selected modulation and coding mode; and the transmitter, configured to perform precoding according to the statistical value of the channel state information and the modulation and coding mode of each of the null subchannels.
  • the part of the transmitter performing precoding processing comprises a channel estimation module of a channel parameter, a singular value decomposition module and a spatial subchannel power allocation module :: a channel estimation module for the channel parameter, Obtaining a current channel state information matrix by using the statistical value of the channel state information; the singular value decomposition module is configured to perform singular value decomposition on the channel state information matrix to obtain gains of q active spatial subchannels, and further Obtaining a transmit beamforming vector; the spatial subchannel power allocation module, configured to determine a transmit power allocation of the q active subchannels according to a modulation coding mode selected by the subchannel and a gain of the q active subchannels.
  • a modulation and coding table is stored in both the receiver and the transmitter, and the modulation and coding table records various modulation and coding modes, and the receiver is different according to the modulation coding table. Determining index information by selecting a location of a modulation coding mode selected by the channel, and transmitting the index information to the transmitter through a feedback channel, where the transmitter finds different subchannels in the modulation and coding table according to the index information The selected modulation coding method.
  • the statistical value is a mean value, a variance, and/or a related matrix parameter of channel state information.
  • the AMC of the present invention can compare Accurately reflect fast wireless channel changes and obtain better robust performance. Secondly, since the feedback is only "index", the channel state information is not fed back in real time, which reduces the bandwidth requirement of the feedback channel.
  • Precoding does not directly use channel state information, but uses statistical information of channel state information, such as mean, variance and correlation matrix parameters, to reduce the sensitivity of the performance of the precoding system to channel state information errors.
  • the present invention provides an AMC and pre-coding cascade design structure that is reasonably balanced in complexity, achievability, and performance. In particular, the present invention greatly reduces the amount of feedback information.
  • Figure 1 is a flow chart showing the steps of the method of the present invention
  • FIG. 2 is a flow chart of a receiver selecting a modulation order according to SINR/SNR in the present invention.
  • Figure 3 is a functional block diagram of a receiver in the present invention.
  • FIG. 4 is a block diagram of a signal processing structure of a physical layer of a transmitter in the present invention.
  • FIG. 5 is a flow chart of adaptive modulation of a transmitter according to modulation and coding information according to the present invention
  • FIG. 6 is a functional block diagram of a precoding parameter processing module according to the present invention
  • FIG. 8 is a flowchart of a transmission power allocation process in the present invention. detailed description
  • the receiver can obtain approximately perfect channel state information, measured or estimated.
  • SINR/SNR Signal to Interference and Noise Ratio
  • SNR Signal to Noise Ratio
  • the present invention selects a modulation coding mode for each spatial subchannel by using accurate channel state information on the receiver side, can accurately reflect fast wireless channel variation, obtain better robust performance, and most importantly, receive The machine does not have to sell the channel state information to the transmitter when it is sold, which reduces the bandwidth requirement of the feedback channel.
  • Step 101 The receiver determines, according to channel state information estimated by the receiver side, a modulation and coding mode selected by each spatial subchannel;
  • Step 102 The receiver feeds the selected modulation and coding mode by feedback channel feedback Give the transmitter
  • Step 103 The transmitter performs precoding according to a statistical value of the channel state information and a modulation and coding manner, and determines a transmit power and a transmit weight vector of each subchannel.
  • the receiver measures and estimates the SINR/SNR of each spatial subchannel, and then based on the SINR/SNR of each spatial subchannel and sets a threshold from a limited constellation.
  • a signal modulation coding mode is selected as the spatial subchannel, and then the receiver transmits the index information to the transmitter through the feedback channel.
  • the transmitter selects the corresponding modulation and coding scheme for each spatial subchannel according to the received MCI (modulation coding information, ie "segment bow").
  • the transmit and encoder further determines the transmit power and transmit beam direction of each spatial subchannel using the obtained CSI based on the determined MCI.
  • Step 201 the receiver array receives the signal
  • Step 202 The receiver performs channel estimation.
  • Step 203 The receiver measures the SINR or SNR of each spatial subchannel:
  • Step 204 Compare, according to SINR/SNR thresholds of different modulation orders, select a corresponding modulation step, and turn off a subchannel that is lower than a SINR/SNR threshold corresponding to the lowest modulation order.
  • Step 205 Encode the selected modulation order index and send it to send on the feedback channel.
  • the SINR/SNR For the correspondence between the SINR/SNR, the modulation mode, the threshold, and the index, refer to Table 1, which provides an embodiment in which the receiver determines the subchannel modulation code according to the SINR/SNR, and the table shows that the SINR/SNR is smaller than The 3dB subchannel will be closed, meaning that the low gain spatial subchannel will not be used.
  • SINR/SNR > 20 64QAM 4
  • the receiver notifies the transmitter of the selected modulation and coding scheme by sending an "index".
  • a modulation dictionary corresponding to a "dictionary” is stored in the receiver and the transmitter, respectively.
  • the coding table records various modulation and coding modes. After the receiver determines the modulation and coding mode of each spatial subchannel, the corresponding index is found from the "dictionary", and then the index is fed back to the transmitter through the feedback channel. According to the index, the transmitter obtains the corresponding modulation and coding mode of the spatial subchannel from the "dictionary".
  • the present invention also provides a rate and power control device for each spatial subchannel, including a receiver and a transmitter.
  • FIG. 3 shows the receiver function block diagram.
  • Receiver physical layer signal processing In addition to general functional modules such as channel estimation, information decoding and demodulation, spatial subchannel SINR/SNR measurement or estimation, space is also included in the present invention.
  • the main function modules such as subchannel modulation mode determination and local storage, subchannel modulation mode feedback.
  • the spatial subchannel modulation coding mode is selected from the modulation coding types known to both the transmitter and the receiver, and then all subchannels are selected.
  • the modulation coding index is sent to the transmitter through the feedback channel and stored locally to demodulate the signal.
  • FIG. 4 shows the block diagram of the signal processing structure of the physical layer of the transmitter.
  • the transmitter signal processing mainly includes adaptive modulation coding and transmission precoding, which are described in detail below.
  • the transmitter first acquires the MCI from the feedback channel and obtains the number of active spatial subchannels q. Then, the input data stream is subjected to serial-to-parallel conversion (DEMUX), the transmission data bits are allocated on each spatial subchannel, and then the modulation coding is performed according to the MCI on each subchannel, by: the modulation coding of each subchannel corresponds to one of the MCIs. Information bits, according to this information bit, look up the modulation coding table (known to both the transmitter and the receiver), obtain the modulation order of each subchannel, and then perform signal modulation coding according to different modulation orders on different spatial subchannels.
  • Figure 5 is a subdivision step of the transmitter adaptive modulation according to MCI, as shown in the figure, including:
  • Step 501 The transmitter acquires the MCI from the feedback channel, and separates the AMC information bit for each active subchannel from the MCI.
  • Step 502 Find a modulation and coding table, and determine a modulation order of each spatial subchannel.
  • Step 503 Perform constellation mapping for each spatial subchannel according to modulation coding selection.
  • Step 504 further process the modulated coded signal and the MCI input precoder.
  • the transmitter includes a precoding parameter processing module 30, and FIG. 6 is a functional block diagram of the precoding parameter processing module.
  • the precoding process includes spatial subchannel power allocation ( ⁇ ⁇ ) and transmit beamforming. (w, w,) two main functions, respectively, corresponding to the spatial subchannel power allocation module 301 in Figure 6, Channel estimation module 302 for channel parameters and singular value decomposition (SVD) module 303. Since the precoding process requires the transmitter to know the current channel state information, in the present invention, the transmitter obtains the statistical value of the current channel state information through the feedback channel or directly estimates the reverse channel, and then uses the statistical value to estimate the current channel state information. H.
  • One embodiment for estimating the current channel information by using the channel mean and the transmit correlation matrix is: First, the channel mean and the transmit correlation matrix are obtained, assuming Hi is the real-time channel information estimate, L is the channel correlation time length or the observation window width, then the channel mean ⁇ and the emission correlation matrix R t is:
  • N the number of receiving antenna elements. Then, the estimate of the current channel information is
  • 1 ⁇ is a > ⁇ complex complex Gaussian random matrix whose elements have zero mean and unit variance.
  • N is the number of transmitting antenna elements.
  • SSD singular value
  • FIG. 7 is a subdivision processing flow for acquiring a beamforming vector W
  • Step 701 The transmitter estimates channel state information.
  • Step 702 Perform singular value decomposition (SVD) on the estimated channel state information matrix.
  • SVD singular value decomposition
  • Step 703 Obtain a number of active subchannels according to the input MCI.
  • Step 704 output q active subchannel gains, which are squares of q maximum eigenvalues
  • Step 705 taking the right feature vector corresponding to the q largest eigenvalues of the SVD decomposition as the subchannel transmitting beam direction vector wl, "wq.
  • FIG. 8 is a flowchart of a transmission power allocation process, as shown in the figure, including the following steps:
  • Step 801 Obtain subchannel modulation and coding information according to the MCI.
  • Step 802 input an active subchannel gain
  • Step 803 The spatial subchannel optimizes the transmit power allocation, and obtains the transmit power allocation of the q active spatial subchannels ⁇ , — ⁇
  • One embodiment of spatial subchannel power allocation is to minimize the spatial subchannel optimization power allocation of the system error rate (BER) under the constraint of total transmit power ⁇ . Its constrained optimization equation can be expressed as a square (4): fiber, )
  • Equation (4) is the signal to interference and noise ratio of the i-th spatial subchannel; is a Q function, defined according to equation (5); a, ⁇ , is the modulation order of the i-th spatial subchannel, According to MCI.
  • the present invention considers AMC, and also considers adaptive transmit power allocation and transmit beamforming, that is, AMC and pre-coding cascade design; unreliability based on transmitter channel state information and dispersion of modulation order Limitation, the present invention adopts a strategy of receiver signal processing and AMC decision feedback, that is, the modulation coding mode of each spatial subchannel is processed by the receiver, and then only the decision result is fed back to the transmitter, and the precoding is still transmitted by the receiver.
  • the machine is designed according to the estimated CSI.
  • the present invention achieves a balance and improvement in achieving complexity, performance, and achievability. Therefore, the present invention has the following main features
  • the AMC is determined by the receiver based on the measured SINR/SNR of the spatial subchannel and a set threshold, and the final modulation coding selection index is fed back.
  • the receiver determines the modulation and coding scheme of each subchannel based on the estimated channel state information, finds the corresponding index from the "dictionary”, and then feeds the index back to the transmitter through the feedback channel. According to the index, the transmitter obtains the corresponding modulation and coding method from the "dictionary".
  • the transmission precoding is based on the statistical information and feedback of the channel state information obtained by the transmitter side.
  • the MCI jointly determines that the transmit power allocation is jointly determined by the transmitter-side estimated channel condition and the sub-channel modulation and coding mode; the pre-coding does not directly use the instantaneous channel state information, but uses the channel state information statistical information (CSI). , such as mean, variance, and correlation matrix parameters.
  • CSIs are obtained in the following ways: 1) In the TDD system, the transmitter obtains the statistics of the forward channel by estimating the reverse channel and obtaining the reverse channel estimate over a relatively long period of time or time window. Information, such as channel mean, etc. 2) In the FDD system, after the receiver estimates the channel information, it calculates the channel's statistical information, such as the channel mean, etc., and then sends it to the transmitter through the feedback channel.
  • AMC and pre-coding cascaded design structures with reasonable balance of complexity, achievability and performance.
  • the present invention greatly reduces the amount of feedback information.
  • the AMC of the present invention can accurately reflect the fast wireless channel variation and obtain better robust performance. Secondly, the bandwidth requirement of the feedback channel is reduced. '
  • the present invention reduces the implementation complexity of the transmitter.
  • the prior art fully adaptive AMC cascading transmit precoding design is theoretically optimized in performance, the implementation complexity is high, resulting in large signal processing delays and greatly reduced performance in rapidly changing wireless environments.
  • the prior art optimization implementation to obtain modulation coding must be subject to a limited discrete modulation coding mode, resulting in performance loss.
  • the present invention is more advantageous to implement the actual system.
  • the AMC system can only use finite signal modulation coding, so this method compromises performance and implementation complexity.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Probability & Statistics with Applications (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un moyen de réglage de débit et de puissance d'un sous-canal en fonction de l'espace. Le procédé est mis en œuvre comme suit: le récepteur détermine un mode de modulation et de codage choisi pour chaque sous-canal spatial en fonction de données d'état de canal côté récepteur; le récepteur informe l'émetteur du mode de modulation et de codage choisi, sous forme d'index; l'émetteur effectue un précodage sur la base de la valeur statistique des données d'état de canal et du mode de modulation et de codage du sous-canal. Etant donné que, selon l'invention, seul l'index fait l'objet d'une rétro-information, et que la rétro-information en temps réel des données d'état de canal n'est pas nécessaire, la largeur de bande requise pour faire passer les données de rétro-information s'en trouve réduite. Des informations statistiques des données d'état de canal, telles qu'un paramètre matriciel de moyenne, de variance ou de rapport, sont utilisées pour le précodage, ce qui réduit la sensibilité de la performance du système de précodage à une erreur dans les données d'état de canal.
PCT/CN2007/003148 2007-02-09 2007-11-06 Procédé et moyen de réglage de débit et de puissance d'un sous-canal en fonction de l'espace WO2008098442A1 (fr)

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CNA2007100637927A CN101242205A (zh) 2007-02-09 2007-02-09 一种每空间子信道的速率和功率控制方法及控制装置
CN200710063792.7 2007-02-09

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CN1780278A (zh) * 2004-11-19 2006-05-31 松下电器产业株式会社 子载波通信系统中自适应调制与编码方法和设备

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CN111434060A (zh) * 2017-12-06 2020-07-17 高通股份有限公司 基于解调数据依赖于多个调制的差错率估计的调制选择

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