Frequency domain equalization method based on generalized approximated message passing

Abstract

The invention provides a frequency domain equalization method based on generalized approximated message passing, which can solve the ill-conditioned regeneration in the message updating process, effectively alleviate the ill-conditioned problem of MFTN signals, and avoid the problem that a receiving demodulation algorithm is difficult to converge. The low-complexity balance of an MFTN system is solved when two-dimensional strong self-interference and color noise exist, the application limitation of a generalized approximated message passing algorithm communication system can be broken through, and the situation that a receiving demodulation algorithm is difficult to converge is avoided. According to the method, a block cyclic equivalent channel matrix with a cyclic block is constructed, only a small number of cyclic postfixes (CP) need to be inserted to construct a frequency domain system model, the condition number of the equivalent channel matrix in an MFTN system is effectively reduced, and therefore the influence of the MFTN signal on the performance of a receiver due to the ill-conditioned problem is relieved.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a Frequency-Domain Equalization (FDE) method based on Generalized Approximate Message Passing (GAMP). Background technique [0002] With the ever-increasing demand for spectrum resources, Multicarrier Faster-Than-Nyquist (MFTN), with its high frequency domain efficiency, easy and non-orthogonal multiple access, and sparse code division multiple access The combination of advanced communication technologies such as multi-input and multi-input multi-output, and good compatibility with existing orthodox communication systems have attracted extensive research and attention in the field of wireless communication. By simultaneously compressing the minimum Nyquist interval in the time domain and the frequency domain, MFTN can significantly increase the transmission rate of the wireless communication system without adding additional spectrum resources. Interference...

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Problems solved by technology

Therefore, this method requires a Gaussian approximation to the discrete prior probability of the transmitted signal, which inevitably introduces BER performance loss

In addition, the above methods do not consider the ill-conditioned problem of the two-dimensional interference matrix introduced by the time-frequency domain compression in the MFTN signal, that is, the condition number of the two-dimensional interference matrix is ​​large, which makes it difficult for the receiving demodulation algorithm to converge

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