Decision feedback model-based digital symbol nonlinear error correction equalization method

Abstract

The invention discloses a decision feedback model-based digital symbol nonlinear error correction equalization method, which comprises the following steps: processing a signal received by a receiver by utilizing a feed-forward delay register, and rapidly calculating a front-path interference cancellation signal; processing an output signal of a data decision module by utilizing a feedback delay register, and rapidly calculating a back-path interference cancellation signal; performing subtraction on the front-path interference cancellation signal and the back-path interference cancellation signal to obtain an interference cancellation signal, and processing the signal to obtain a transmitted symbol by virtue of the data decision module; obtaining a final equalizer coefficient by utilizing an expected signal of the symbol, a current interference cancellation signal and signals before and after the expected signal and the current interference cancellation signal. According to the method, increase of complexity is avoided, inter-code interference and inter-channel interference of communication channels can be rapidly cancelled, high nonlinear approximation property of the interference cancellation signal and low complexity of a minimum mean square error-based equalization coefficient updating scheme are utilized, and the method has the advantages of accuracy, stability and high efficiency in high-carrier high-bandwidth wireless communication.

Description

technical field [0001] The invention relates to a nonlinear equalization method for a digital receiver, in particular to a digital symbol nonlinear error correction (Symbol nonlinear error correction) equalization method based on a decision feedback (Decision feedback) model. Background technique [0002] With the development of digital communication technology, the extensive use of high-carrier and high-bandwidth wireless communication technology in the field of communication makes the transmission characteristics of wireless channels increasingly complex. High-carrier communication technology means a great increase in communication rate and capacity, but it is also accompanied by an increase in intersymbol interference. The high-bandwidth communication technology can also effectively increase the communication rate, but the high-bandwidth communication technology will increase inter-channel interference. These two kinds of interference will seriously affect the signal qua...

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Problems solved by technology

[0004] In view of the weak nonlinear processing ability, high computational complexity and slow convergence speed of the existing equalization technology, it cannot meet the needs of the next generation of high-carrier frequency and high-bandwidth wireless communication for inter-symbol interference and inter-channel interference suppression performance at the receiving end , the present invention designs a digital symbol nonlinear error correction and equalization method based on a decision feedback model, which mainly includes four parts: a front path interference elimination module, a rear path interference elimination module, a data judgment module and an equalization coefficient update module

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