Low-complexity turbo equalization method based on precoding

Abstract

The invention discloses a balancing method with low complexity based on precoding for turbo. At a sending terminal of a communication system, signal coding is interleaved and coded, and then a precoding technique is adopted. After the interleaved and coded signal coding passes through an IS I-channel, signals are outputted and an expression thereof is that: y(n) is equal to sigma k is equal to 0h(k)c< - > (n-k) +w(n); at a receiving terminal, based on EXIT figures of an equalizer and an encoder in different signal-to-noise ratios and iterations, a P-TE proposal and a S-TE proposal are self-adaptively selected and a balancing algorithm capable of reducing the complexity of the system is adopted. External information is iterated and transferred between the equalizers or between the equalizer and the encoder, and passes through an interleaver and a de-interleaver in the process of the iteration, and finally when the iterations required by the system are realized or the performance meets the requirements, the iteration is stopped and a final output information sequence is obtained by judgment of the encoder. The balancing method with low complexity based on precoding for turbo can reduce the complexity of the system; the performance of the system can exceed the lower limit of an error rate in the conditions of no ISI channel with the same coding and decoding.

Description

technical field [0001] The present invention relates to a Turbo equalization technique for overcoming intersymbol interference (ISI). Background technique [0002] As we all know, in order to realize the reliable transmission of the communication system, the receiver must be able to estimate the transmitted data according to certain information, which includes the parameters of the channel and the redundant information (error correction code) added to protect the data. The method used to solve the channel ISI interference is called equalization or detection, and the method of using the forward error correction code (FEC) to obtain the transmitted data from the equalized data is called decoding. The above problems are generally considered separately. This method of separately considering the two units that are originally interdependent and related will inevitably result in performance loss. In 1995, Douillard C first proposed Turbo Equalization (TE) in his article "Iterative...

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Problems solved by technology

[0005] The present invention aims at the problem of high complexity existing in the existing turbo equalization technology of intersymbol interference, and provides a low-complexity turbo equalization method based on precoding, aiming at reducing the self-adaptation based on the external information transfer (EXIT) graph based on precoding Select the complexity of the iterative equalization system of P-TE and S-TE appropriately, and realize the performance exceeding the lower limit of performance without ISI without increasing the system complexity by properly selecting the appropriate precoder

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