MIMO-SCFDE system joint iterative channel estimation and iterative equalization method

Abstract

The invention belongs to the technical field of communication and information processing and discloses an MIMO-SCFDE system joint iterative channel estimation and iterative equalization method, whichcomprises the steps that a time-frequency two-dimensional orthogonal discrete pilot frequency is selected as a pilot frequency pattern; each SC-FDE block has P pilot frequency; the insertion mode andthe number of the pilot frequency on each transmitting antenna are the same, and the pilot frequency position is known for a receiving end and a sending end; an initial channel estimation is obtainedat the receiving end through a pilot frequency receiving signal and an MMSE channel estimation method; iterative feedback equalization is performed by using the channel estimation information to obtain a decision for a transmission data symbol; the determined data symbol is used as a known pilot frequency to be fed back to a channel estimation part for iterative estimation, and the CSI is updated;and the updated CSI is further used for updating feedforward and feedback equalization coefficient matrixes so as to perform more accurate equalization. According to the method in the invention, fewer pilot symbols can be selected, and good channel estimation and equalization performance can be realized.

Description

technical field [0001] The invention belongs to the technical field of communication and information processing, and in particular relates to a joint iterative channel estimation and iterative equalization method for a MIMO-SCFDE system. Background technique [0002] The multipath effect of the wireless channel will bring about the delay spread, and cause serious inter-symbol interference (ISI) in the high-speed wireless communication system. Orthogonal Frequency Division Multiplexing (OFDM) technology can effectively overcome ISI with low signal processing complexity and has become the current wireless local area network (WLAN) standard. However, OFDM is extremely sensitive to system carrier frequency offset and symbol timing offset, and a small offset will cause severe ISI and sub-carrier interference (ICI). The power efficiency of the power amplifier and the battery life of the mobile terminal have a great impact. In recent years, Single-Carrier Frequency Domain Equaliz...

AI Technical Summary

Problems solved by technology

[0003] To sum up, the problems existing in the existing technology are: there is a large deviation between the estimated CSI and the real CSI in the traditional pilot-assisted MIMO-SCFDE system channel estimation method, which seriously reduces the system performance; only in channel equalization Iteration between related modules limits the improvement of system performance; considering channel estimation and equalization as two independent processes makes it difficult for the system to achieve the overall optimal

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