WO2009097808A1 - Procédé d'adaptation de liaison dans des systèmes de communication mobile sans fil large bande, système et appareil correspondants - Google Patents

Procédé d'adaptation de liaison dans des systèmes de communication mobile sans fil large bande, système et appareil correspondants Download PDF

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Publication number
WO2009097808A1
WO2009097808A1 PCT/CN2009/070285 CN2009070285W WO2009097808A1 WO 2009097808 A1 WO2009097808 A1 WO 2009097808A1 CN 2009070285 W CN2009070285 W CN 2009070285W WO 2009097808 A1 WO2009097808 A1 WO 2009097808A1
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Prior art keywords
signal
change
channel
noise ratio
factor
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PCT/CN2009/070285
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English (en)
Chinese (zh)
Inventor
Yang Yu
Shaohui Sun
Yingmin Wang
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Da Tang Mobile Communications Equipment Co., Ltd.
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Publication of WO2009097808A1 publication Critical patent/WO2009097808A1/fr

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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
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • 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
    • 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
    • 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
    • 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
    • H04L5/0078—Timing of allocation
    • H04L5/0085—Timing of allocation when channel conditions change

Definitions

  • the present invention relates to mobile communication technologies, and in particular, to a broadband wireless mobile communication system link adaptation method, system and apparatus. Background of the invention
  • broadband wireless mobile communication has become the main development direction of mobile communication.
  • ITU International Advanced Telecommunications
  • ITU International Telecommunications Union
  • the maximum bandwidth of wireless mobile communication is 100MHz
  • the maximum transmission rate is up to 1Gbps, which can satisfy users' wireless.
  • Great demand for mobile communications Through broadband wireless mobile communication, users can enjoy high-speed data download, online shopping, mobile video chat and mobile TV and many other wireless mobile services.
  • a wireless channel is a multipath time-varying channel, including propagation loss, fast fading, slow fading, and interference variation, so that the quality of the received signal is also affected by channel conditions. variable.
  • link adaptation technology is generally used in the communication process. This technology has been widely recognized as an important means to effectively improve spectrum utilization in broadband wireless mobile communication systems. one.
  • the link adaptation technology performs effective adjustment of the transmission parameters according to the obtained channel state information, such as time, frequency or spatial characteristic information, to implement adaptive transmission. Therefore, the channel state information needs to be able to accurately reflect the actual state of the channel.
  • channel state information is measured by a user terminal (UE, User Equipment). And feedback to the base station.
  • UE User Equipment
  • high-speed mobile UEs for example, high-speed railways can now reach speeds of 250Km/h, while maglev trains can reach speeds of 400Km/h.
  • the base station receives the channel state information fed back by the UE, the actual channel state has undergone a new change, that is, there is a measurement error between the channel state information received by the base station and the actual channel state. Therefore, using link adaptation technology in a high-speed moving scenario will result in worse performance, especially for Time Division Duplexing (TDD) systems, where feedback delay is large, and link adaptation techniques are applied. The impact will be more significant.
  • TDD Time Division Duplexing
  • existing link adaptation techniques generally refer to technologies such as adaptive power control or Adaptive Modulation and Coding (AMC).
  • AMC Adaptive Modulation and Coding
  • MCS modulation and coding scheme
  • MCS the measurement result report delay (refer to the time between the UE obtaining the channel state information and the base station selecting the MCS) also reduces the reliability of the channel estimation.
  • the delay mentioned here mainly refers to the processing time of the UE and the processing of the base station. Time and delay caused by multiplexing and scheduling.
  • HARQ Hybrid Automatic Retransmission Request
  • ARQ Automatic Retransmission Request
  • FEC Forward Error Correction
  • This method can increase the system
  • the reliability of the system can improve the transmission efficiency of the system.
  • HARQ technology puts forward higher requirements on the transceiver storage device: For the receiving end, the receiving end needs to buffer the decoding error data, until the retransmitted data is received and the decoding is correct, the buffered data will be cached. Release, if there is more data to be retransmitted, the buffer space that needs to be occupied will be very large. Similarly, for the sender, the data that is not acknowledged needs to be buffered until the correct acknowledgement message sent by the receiver is received. , in order to release the cached data;
  • the main object of the present invention is to provide a link adaptive method for a broadband wireless mobile communication system, which can improve the spectrum utilization rate of the system in a high-speed mobile scenario.
  • Another object of the present invention is to provide a broadband wireless mobile communication system capable of improving the spectrum utilization rate of a system in a high speed mobile scenario.
  • Still another object of the present invention is to provide a broadband wireless mobile communication device capable of improving spectrum utilization of a system in a high speed mobile scenario.
  • the technical solution of the present invention is implemented as follows: A link adaptation method for a broadband wireless mobile communication system, the method comprising: analyzing channel state information, calculating a channel change factor, according to the channel change The factor determines whether the current channel state changes drastically;
  • the block repeat orthogonal frequency division multiple access method is used for signal transmission; if not, the orthogonal frequency division multiple access method is used for signal transmission.
  • a broadband wireless mobile communication system includes: a base station and a user terminal; the user terminal is configured to analyze channel state information, calculate a channel change factor, and report the channel change factor to the base station;
  • the base station is configured to determine, according to the received channel change factor, whether the current channel state changes drastically, and if yes, use a block-repetitive orthogonal frequency division multiple access method to perform signal transmission; if not, use orthogonal frequency division multiple The address mode is used for signal transmission.
  • a broadband wireless mobile communication device comprising: a computing unit, a determining unit
  • the calculating unit is configured to calculate a channel change factor according to the acquired channel state information
  • the determining unit is configured to determine, according to the channel change factor, whether the current channel state changes drastically;
  • the transmitting unit is configured to perform signal transmission by using a block-repetitive orthogonal frequency division multiple access method when the judgment result of the determining unit is a drastic change of the current channel state; otherwise, the signal is performed by using an orthogonal frequency division multiple access method. emission.
  • the channel state information is analyzed, the channel change factor is calculated, and the current channel state is determined to be drastically changed according to the calculated channel change factor; if yes, the block repeat orthogonal frequency division is used.
  • the address mode performs signal transmission; if not, the orthogonal frequency division multiple access method is used for signal transmission.
  • FIG. 1 is a flow chart of an embodiment of a link adaptation method for a broadband wireless mobile communication system according to the present invention.
  • FIG. 2 is a schematic structural diagram of an embodiment of a broadband wireless mobile communication system according to the present invention.
  • FIG. 3 is a schematic structural diagram of an embodiment of a broadband wireless mobile communication device according to the present invention. Mode for carrying out the invention
  • the present invention proposes a new link adaptation method for a broadband wireless mobile communication system, which selects different signal transmission modes according to different channel states, so as to improve the system in a high-speed mobile scene. Capacity and spectrum utilization.
  • the specific implementation idea is: analyzing the channel state information, calculating a channel change factor, determining whether the current channel state changes drastically according to the channel change factor; if yes, using block repetition orthogonal frequency division multiple access (BR-OFDMA) , Block Repeat- Orthogonal Frequency Division Multiple Access) performs signal transmission; if not, it adopts OFDMA mode for signal transmission, and can use adaptive schemes such as AMC and HARQ in signal transmission.
  • BR-OFDMA block repetition orthogonal frequency division multiple access
  • the solution of the present invention is particularly suitable for use in a TDD broadband wireless mobile communication system.
  • FIG. 1 is a flowchart of a link adaptation method for a broadband wireless mobile communication system according to the present invention. Figure. As shown in Figure 1, the following steps are included:
  • Step 101 The channel state information is analyzed, the channel change factor is calculated, and the current channel state is determined to be drastically changed according to the calculated channel change factor. If yes, step 102 is performed; otherwise, step 103 is performed.
  • the channel state information used in the link adaptation scheme is the Signal to Interference Noise Ratio (SINR) of the time-frequency resource block PRB.
  • SINR Signal to Interference Noise Ratio
  • the duration in which the UE is in a state of a certain moving speed is often much larger than the statistical period of the wireless communication system. Therefore, an extreme situation can be envisaged.
  • the starting time is usually 40s, that is, the speed change from quiescent state to acceleration to 400Km/h is only 10Km/h.
  • the amount of change does not substantially affect the channel state in which the UE is located.
  • 200 times of 5 ms subframes will be experienced within the time of Is, and the channel variation can be fully investigated. Therefore, a relatively long time window, such as ls, can be set. In this time window, the average rate of change of the SINR sequence is examined, and the average rate of change of the SINR sequence is used as a channel variation factor to reflect the channel state change.
  • the specific implementation is as follows:
  • the SINR sequence 0, ⁇ , ⁇ 2 , ..., a N is measured, and the measurement interval is seconds.
  • the specific measurement method is prior art and will not be mentioned.
  • the reciprocal of the correlation coefficient y between pilots is used as the channel change factor in the embodiment of the present invention.
  • the reciprocal of the inter-pilot correlation coefficient ⁇ is compared with the preset threshold value, and it is determined whether the reciprocal of the inter-pilot correlation coefficient ⁇ is greater than a preset threshold, and if so, the current The channel state changes drastically; if not, it indicates that the current channel state change is relatively stable.
  • the combination of the average rate of change of the SINR sequence and the correlation coefficient y between the pilots may be used as the channel variation factor, and the specific combination manner may be set as needed.
  • the simplest combination method may be adopted: an average rate of change of the SINR sequence + a correlation coefficient between pilots, or a weight coefficient and the like before the average rate of change of the SINR sequence and the correlation coefficient y between the pilots. After that, it is judged whether the result obtained by combining the average rate of change of the SINR sequence and the reciprocal of the inter-pilot correlation coefficient y is greater than a preset threshold, and if so, the current channel state is drastically changed; Then, the current channel state change is relatively stable.
  • Step 102 Perform signal transmission by using the BR-OFDMA method, and then end the process.
  • the BR-OFDMA mentioned here refers to the combination of OFDMA and Code Division Multiple Access (CDMA) technology.
  • CDMA Code Division Multiple Access
  • block repetition is used instead of chip repetition in conventional CDMA.
  • Substituting the block repetition code for the spreading code to obtain the code domain spreading gain; using different or low correlation block repetition codes between different cells or users, and using the multi-user joint detection receiving method at the receiving end to eliminate inter-cell or user Interference to improve system performance.
  • the BR-OFDMA technology is used in the high-speed mobile scenario. Therefore, in the embodiment of the present invention, when the current channel state is determined to be drastically changed, the BR-OFDMA mode is used for signal transmission, and the specific implementation includes: Matching, grouping according to the channel state of the UE, grouping UEs with similar channel states into the same group; determining block repetition factor (RF, Repeat Factor) and block repetition pattern corresponding to each group of UEs, and using UEs in each group The same RF and block repeat pattern; signal transmission is performed according to the determined RF and block repeat patterns.
  • RF, Repeat Factor block repetition factor
  • signal transmission is performed according to the determined RF and block repeat patterns.
  • a BR-OFDMA resource block occupies RF basic time-frequency resource blocks and can support RF user data. Each user uses 1/RF of transmit power.
  • each RF UE is divided into a group, and UEs in each group use the same RF and the same block repetition pattern. In this way, there will be a problem of user matching, and UEs in the same group need to have similar channel states.
  • the specific grouping manner is: acquiring channel change factors and path loss values corresponding to each UE. The acquisition of the channel change factor has been introduced in step 101. The acquisition of the path loss value is prior art and will not be described again.
  • the UEs are sorted according to the size of the path loss value, and then sorted according to the channel change factor in the UEs with similar path loss values, thereby finding UEs with similar path loss values and channel change factors, These UEs are grouped together to determine their corresponding RF and block repetition patterns.
  • the implementation complexity of the multi-user joint detection algorithm in BR-OFDMA is related to RF.
  • a smaller RF should be used, and for calculation convenience, the value of RF should be an integer power of 2. For example, 4, 8 or 16 and so on.
  • the RF value is small, it will not be able to improve the spectrum utilization of the system in high-speed mobile scenarios.
  • BR-OFDMA will degenerate into the traditional OFDMA.
  • the larger the RF the more obvious the diversity gain effect, and the more obvious the effect of overcoming the fast decay. Therefore, in practical applications, it is necessary to comprehensively consider the above various factors to properly determine the value of the RF.
  • the RF may be determined according to the size of the channel change factor. For example, the larger the channel variation factor is, the more severe the current channel state changes, and the larger the value of the RF.
  • the mapping of block repetitions in the time-frequency domain can have multiple modes, such as time domain block repetition, frequency domain block repetition, time-frequency two-dimensional block repetition, continuous resource block repetition, and distributed resource block repetition.
  • Different mapping methods have different effects on system performance.
  • time-frequency block repetition is advantageous for obtaining time-domain diversity gain, so it is suitable for high-speed moving scenes, but it is not conducive to obtaining frequency-domain diversity gain.
  • Frequency-domain block repetition is beneficial for obtaining frequency-domain diversity gain, so it is suitable for multi-path expansion comparison. Large scenes;
  • the impact of time-frequency two-dimensional block repetition on system performance is a compromise between the two.
  • distributed resource block repetition can obtain better diversity gain, but it will increase the overhead indicated by the resource allocation instruction. It can be seen that each of the above repeated mapping modes has its advantages and disadvantages. Do not apply to different situations.
  • several typical block repetition patterns may be preset, and the block repetition pattern used in the UE communication may be controlled according to the following two control modes: one is a short period control mode, according to a channel change The size of the factor is selected, that is, whether the channel change factor is greater than a preset threshold, and if so, a block repeat pattern suitable for a high-speed moving scene in a preset block repeat pattern, such as a time domain block repeat pattern, is selected. Otherwise, select a block repeat pattern suitable for non-high-speed moving scenes in a preset block repeat pattern, such as a frequency domain block repeat pattern or a time-frequency two-dimensional block repeat pattern. The other is the long-cycle control mode.
  • the block repeat pattern is adjusted according to the calculated block error rate. If the block error rate is large, the currently used block repeat pattern is adjusted to the opposite scene repeat pattern. For example, if the block repetition pattern currently used is a time domain block repetition pattern, if the calculated block error rate is greater than a preset threshold, it indicates that the currently used block repetition pattern is not applicable to the current channel state. So you can adjust it to a frequency domain block repeat pattern.
  • the statistical method of the block error rate is prior art and will not be mentioned.
  • the AMC technology in the process of transmitting signals by using the BR-OFDMA method, in order to further improve the spectrum utilization rate of the system, can also be used to adjust the signal coding modulation mode during signal transmission. It is well known to those skilled in the art that in the implementation of the AMC technology, the selection of the MCS is a very critical step, and the selection of the MCS is usually based on the signal-to-noise ratio in the channel state information, so that the signal-to-noise ratio is obtained. problem.
  • the signal-to-noise ratio experienced by the BR-OFDMA is different from that of the conventional OFDM.
  • two ways of obtaining the signal-to-noise ratio in the BR-OFDMA are proposed: one is to measure the signal to noise ratio (SNR, Signal to Noise) Ratio data, the average value of the measured SNR data is calculated in a preset time window, and the MCS is determined according to the average value; the other is to calculate the average value of the user's signal to interference and noise ratio, The average determines the MCS.
  • SNR signal to noise ratio
  • the MCS is determined according to the average value
  • the average determines the MCS.
  • the SNR data is measured in the same manner as in the prior art, and the average value of the calculated SNR data can better reflect the signal to noise ratio level of the channel where the UE is located.
  • the multi-user joint detection algorithm in BR-OFDMA can largely eliminate the interference between multiple users, due to the nonlinearity of the channel, the interference between users will also There is a partial residual. Therefore, the basic MCS needs to be retracted according to the size of the RF. Generally, the larger the RF, the less the backoff. On the other hand, the larger the signal-to-noise ratio change will affect the system performance.
  • the MCS needs to be rolled back according to the variance of the SNR. Generally, the smaller the variance of the SNR, the less the backoff.
  • the system matrix of the nth symbol in the multi-user joint detection algorithm of BR-OFDMA is: - Where c) is the ith block repetition code of user k, which is the ith channel response of user k.
  • Step 103 Perform signal transmission by using the OFDMA method, and then end the process.
  • adaptive schemes such as AMC and HARQ can be further adopted.
  • the specific implementation is the same as in the prior art, and will not be described again.
  • FIG. 2 is a schematic structural diagram of an embodiment of a broadband wireless mobile communication system according to the present invention. As shown in FIG. 2, the system includes: a base station 202 and a UE 201:
  • the UE 201 is configured to analyze channel state information, calculate a channel change factor, and send it to the base station 202;
  • the base station 202 is configured to determine, according to the received channel change factor, whether the current channel state changes drastically. If yes, the BR-OFDMA mode is used for signal transmission; if not, the OFDMA mode is used for signal transmission.
  • the UE 201 includes: a computing unit 2011 and a reporting unit 2012;
  • the base station 202 specifically includes: a determining unit 2021 and a transmitting unit 2022;
  • the determining unit 2021 is configured to determine whether an average change rate of the SINR sequence, or a correlation coefficient between pilots or an average rate of change of the SINR sequence and a correlation coefficient y between pilots is greater than a preset threshold, and if yes, determine The current channel state changes drastically;
  • the transmitting unit 2022 is configured to perform signal transmission by using a BR-OFDMA mode when the judgment result of the determining unit 2021 is a drastic change of the current channel state; otherwise, the OFDMA mode is used for signal transmission.
  • the transmitting unit 2022 includes: a first transmitting unit 2022A and a second transmitting unit 2022B; a first transmitting unit 2022A for performing signal transmission by using a BR-OFDMA method; and a second transmitting unit 2022B for performing signals by using an OFDMA method. Transmitting; wherein, the first transmitting unit 2022A further includes: a grouping subunit 20221, a determining subunit 20222, and a transmitting subunit 20223;
  • a packet subunit 20221 configured to perform grouping according to a channel state of the UE, and group UEs having similar channel states into the same group;
  • the determining subunit 20222 is configured to determine a block repetition factor and a block repetition pattern corresponding to each group of UEs, and the UEs in each group use the same block repetition factor and the block repetition pattern;
  • the transmitting subunit 20223 is configured to perform signal transmission according to the determined block repetition factor and the block repetition pattern.
  • FIG. 3 is a schematic structural diagram of an embodiment of a broadband wireless mobile communication device according to the present invention.
  • the device includes: a calculating unit 301, a determining unit 302, and a transmitting unit 303.
  • the calculating unit 301 is configured to calculate a channel change factor according to the acquired channel state information.
  • the determining unit 302 is configured to determine, according to the calculated channel change factor, whether the current channel state changes drastically;
  • the transmitting unit 303 is configured to perform signal transmission by using a BR-OFDMA mode when the judgment result of the determining unit 302 is a drastic change of the current channel state; otherwise, the OFDMA mode is used for signal transmission.
  • the computing unit 301 further includes: a receiving subunit 3011 and a computing subunit 3012;
  • the receiving sub-unit 3011 is configured to receive, in a preset time window, the measured SINR sequence measurement interval is seconds; and the calculating sub-unit 3012 is configured to calculate a change rate sequence of the SINR sequence, ... ⁇ ⁇ ⁇ , where,
  • the receiving subunit 3011 is configured to receive the pilot channel response H m , k , H: +1 , k , H m , k , H: +1 , k obtained by the UE through channel estimation, respectively, indicating mth and mth, respectively.
  • the determination unit 302 determines whether the reciprocal of the correlation coefficient y between the pilots is greater than a preset threshold, and if so, determines that the current channel state changes drastically.
  • the receiving subunit 3011 is configured to receive the UE in a preset time window, and measure The SINR sequence obtained and reported...
  • the measurement interval is seconds, and the pilot channel response obtained by the UE through channel estimation, H m , +1 respectively represent the guide of the kth subcarrier on the mth and m+1th OFDM symbols Frequency channel response;
  • the calculating subunit 3012 is configured to calculate a rate of change sequence ⁇ of the SINR sequence according to the received SINR sequence. ⁇ , whil, ⁇ ⁇ — ⁇ , where
  • E ( ) represents an expected value
  • the determining unit 302 determines whether the combined result of the average rate of change of the SINR sequence and the correlation coefficient y between pilots is greater than a preset threshold, and if so, Determine the current channel state to make drastic changes.
  • the transmitting unit 303 includes: a first transmitting unit 303A and a second transmitting unit 303B.
  • the first transmitting unit 303A is configured to perform signal transmission by using a BR-OFDMA method
  • the second transmitting unit 303B is configured to perform signals by using an OFDMA method.
  • the first transmitting unit 303A further includes: a grouping subunit 3031, a determining subunit 3032, and a transmitting subunit 3033;
  • a packet subunit 3031 configured to perform grouping according to a channel state of the UE, and group UEs having similar channel states into the same group;
  • the determining subunit 3032 is configured to determine a block repetition factor and a block repetition pattern corresponding to each group of UEs, and the UEs in each group use the same block repetition factor and the block repetition pattern;
  • the transmitting subunit 3033 is configured to perform signal transmission according to the determined block repetition factor and the block repetition pattern.
  • the first transmitting unit 303A may further include: an adjusting subunit 3034, configured to encode and modulate a signal during signal transmission by using an adaptive coding and modulation method. Make adjustments.
  • link adaptive scheduling can be performed by using different strategies according to different application scenarios.
  • UEs that are moving at low and medium speeds can use traditional OFDMA for signal transmission, and can further combine AMC and HARQ technologies to improve system throughput.
  • BR can be used.
  • the OFDMA method performs signal transmission and can be further combined with AMC technology to improve the spectrum utilization of the system.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention porte sur un procédé d'adaptation de liaison dans des systèmes de communication mobile sans fil à large bande. Par analyse d'informations d'état du canal, le facteur de variété de canal est calculé. Une décision est ensuite prise pour déterminer si l'état du canal courant varie dramatiquement ou non sur la base du facteur de variation de canal. Si tel est le cas, des signaux sont transmis par utilisation d'un mode d'accès multiple par répartition orthogonale de la fréquence à répétition de bloc (BR-OFDMA) ; sinon, des signaux sont transmis par utilisation d'un mode d'accès multiple par répartition orthogonale de la fréquence (OFDMA). L'invention décrit également le système de communication mobile sans fil à large bande et l'appareil correspondants. Le procédé, le système et l'appareil peuvent améliorer l'utilisation du spectre dans des circonstances de mobilité à grande vitesse.
PCT/CN2009/070285 2008-02-03 2009-01-22 Procédé d'adaptation de liaison dans des systèmes de communication mobile sans fil large bande, système et appareil correspondants WO2009097808A1 (fr)

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CN101742539B (zh) * 2009-12-25 2012-06-27 国网信息通信有限公司 一种无线资源配置方法和系统
CN101888363B (zh) * 2010-06-22 2013-03-06 北京大学 一种ofdm接收机中的信号解调方法及ofdm接收机
US9077508B2 (en) * 2012-11-15 2015-07-07 Mitsubishi Electric Research Laboratories, Inc. Adaptively coding and modulating signals transmitted via nonlinear channels
CN104022854B (zh) * 2013-03-01 2018-06-05 联想(北京)有限公司 一种信息处理方法及系统
CN104753635B (zh) * 2013-12-31 2018-03-23 展讯通信（上海）有限公司 通信系统中信道质量指示的反馈方法与装置、通信终端
CN105007136A (zh) * 2014-04-23 2015-10-28 中兴通讯股份有限公司 Td-lte系统无线信道响应测量方法及装置
CN105917593B (zh) * 2014-12-12 2019-11-19 华为技术有限公司 基站、移动台及其方法

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