SEFDM signal detection method combined with Turbo code, and wireless communication system

Abstract

The invention belongs to the wireless communication technology field and discloses an SEFDM signal detection method combined with a Turbo code, and a wireless communication system. In combination witha demodulation formula of an SEFDM signal, preliminary demodulation is carried out, and MAP decoding is carried out for the signal after demodulation; the signal after decoding is substituted to thedemodulation formula, and inter-carrier interference on one of sub carriers is further provided; inter-carrier interference is transformed into a circular convolution mode of two sequences, and calculation is convenient; the obtained inter-carrier interference is subtracted from the signal after preliminary demodulation, and the result is sent to the next iteration. The method is advantaged in that in terms of bit error rate performance, when the compression factor is greater than 0.6, bit error rate performance is better compared with the existing algorithm, when the compression factor is less than 0.6, bit error rate performance is close to the existing algorithm; in terms of algorithm complexity, the algorithm complexity of the SEFDM signal detection algorithm combined with the Turbo code is related to the number N of carriers and is smaller than the original algorithm.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a detection method of a SEFDM signal combined with a Turbo code and a wireless communication system. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: In the field of modern wireless communication, with the development of communication technology, spectrum resources become more and more tight. The SEFDM signal deliberately destroys the principle of orthogonality between subcarriers in the OFDM system, making the subcarriers closer together, so that there are more subcarriers in the same bandwidth, thereby obtaining higher spectral efficiency. But doing so will bring a lot of inter-carrier interference (ICI), which will bring many difficulties to the signal detection at the receiving end. Therefore, it is meaningful and valuable to study the detection algorithm of SEFDM signal. Existing t...

AI Technical Summary

Problems solved by technology

This method further improves the bit error rate performance of the system on the basis of the ID-FSD detection algorithm, but the computational complexity of the algorithm is relatively high

To sum up, the problem existing in the prior art is that the complexity of the algorithm is relatively high

[0003] In summary, the problems in the prior art are: 1. The computational complexity of the existing technology is relatively large, which brings many difficulties to the realization of the system in practical application

2. In the case of a small compression factor, the bit error rate performance of the detection algorithm is poor

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