A minimum bit error rate turbo equalization method for multi-channel communication based on a posteriori soft symbols
An equalization method, a soft symbol technology, applied in the directions of preventing/detecting errors through diversity reception, baseband systems, channel estimation, etc., can solve the problems of difficult control of wireless channels, Doppler frequency shift, etc., to achieve performance improvement, complexity Low, small error effect
Active Publication Date: 2022-04-22
SOUTH CHINA UNIV OF TECH
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[0002] In the actual communication system, the process of the signal from the transmitter to the receiver will be affected by reflection, scattering and refraction of various complex terrains, buildings and atmosphere, forming multipath effects. The drastic change of the transmission environment and the transmission environment will cause serious Doppler shift, which makes the wireless channel between the transmitter and receiver more difficult to control
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[0069] This embodiment specifically discloses a multi-channel communication minimum bit error rate Turbo equalization method based on a posteriori soft symbols. In order to facilitate the understanding of the subsequent receiving method, first, a detailed description is given of the structure of the transmission signal frame and the reception signal frame of the communication system. : A frame of sending signal contains N sending data sequences x n , the length of each sent data sequence is N d , N+1 sent training sequences z, each sent training sequence length is N t , the order of arrangement is: zx 1 zx 2 …zx N z; A frame of received signal contains N received data sequences y n , N+1 receive training sequence u n , the sorting order is: u 1 the y 1 u 2 the y 2 … u N the y N u N+1 . It should be noted that when using the minimum bit error rate Turbo equalization method for multi-channel communication based on a posteriori soft symbols proposed in this embodimen...
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The invention discloses a minimum bit error rate Turbo equalization method for multi-channel communication based on a posteriori soft symbols. The present invention adopts the method of direct self-adaptation, better adapts to the time-varying channel, does not adopt the traditional minimum mean square error criterion, but adopts the minimum bit error rate criterion to update the filter coefficients, so as to achieve better convergence performance . In addition, the present invention adopts an effective Turbo equalization double-layer iterative structure. The inner layer iteration is to calculate the posterior soft symbols through the equalization symbols and their prior soft information, and use them to update the filter coefficients adaptively, so that the equalization symbols are closer to The expected signal, and then the more accurate equalization symbols are iteratively exchanged for soft information through the Turbo outer layer, making full use of the error correction gain of the channel coding, and effectively improving the bit error performance of the system. Compared with other methods, the present invention has better robustness and lower bit error rate performance in the time-varying multipath channel environment.
Description
technical field [0001] The invention relates to the technical field of wireless communication, in particular to a turbo equalization method for minimum bit error rate of multi-channel communication based on a posteriori soft symbols. Background technique [0002] In the actual communication system, the process of the signal from the transmitter to the receiver will be affected by reflection, scattering and refraction of various complex terrains, buildings and atmosphere, forming multipath effects. The sharp change of the transmission environment and the transmission environment will cause serious Doppler frequency shift, which makes the wireless channel between the transmitter and receiver more difficult to control. For such a wireless channel with fast time-varying and severe multipath interference, the most common method is to use equalization technology at the receiving end to eliminate Inter Symbol Interference (ISI), and Turbo equalization is a very promising The equal...
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IPC IPC(8): H04L25/02H04L25/03H04L1/06
CPCH04L25/0202H04L25/03019H04L1/06H04L2025/03611
Inventor 余华周剑梁耀坤季飞陈芳炯
Owner SOUTH CHINA UNIV OF TECH