Super Nyquist system symbol estimation method combined with equalization and interference cancellation

Abstract

The invention discloses a super Nyquist system symbol estimation method combined with equalization and interference cancellation. The super Nyquist system symbol estimation method combined with equalization and interference cancellation comprises the following steps: obtaining an input symbol; training an equalizer; judging whether the equalizer training number is less than an equalizer thresholdor not; calculating equalized symbol; calculating an interference cancellation factor of the super Nyquist system; performing iteration for the first time to eliminate inter-symbol interference; performing iteration to eliminate the inter-symbol interference; judging whether the number of iterations is less than an estimation threshold or not; and obtaining the final estimated symbol. The super Nyquist system symbol estimation method combined with equalization and interference cancellation can be used to eliminate the inter-symbol interference in the super Nyquist system, thereby estimating the transmitted symbols; compared with methods in the prior art, the invention can make the super Nyquist system have better bit error rate performance even in the case of more serious inter-symbol interference; and the symbol estimation of the invention is low in complexity and more practical.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a super Nyquist system symbol estimation method for joint equalization and interference elimination in the technical field of wireless communication. The invention can be used to eliminate the intersymbol interference in the super Nyquist system, and then estimate the transmitted symbol of the super Nyquist system transmitter. Background technique [0002] When designing a traditional communication system, in order to avoid system intersymbol interference, the communication system follows the first Nyquist criterion. However, the orthogonality between symbols transmitted by Nyquist transmission systems without intersymbol interference comes at the expense of spectral efficiency. By artificially introducing intersymbol interference, the super-Nyquist system can support higher transmission rate and spectral efficiency. Correspondingly, the super-Nyquist system require...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the estimation accuracy is low because it only eliminates the interference of the previous symbol of the current received symbol, and when the super-Nyquist system uses high-order modulation or serious inter-symbol interference (super-Nyquist The Nyquist acceleration factor is smaller or the receiver matched filter adopts a smaller rolling factor), and its symbol estimation performance is poor

The disadvantage of this method is that its complexity is positively related to the order of the selected modulation method. When the super-Nyquist system adopts a higher order modulation method, its high complexity makes this method ineffective. Practicality

This method reduces the complexity of the receiving end while improving the demodulation performance of the receiving end of the super-Nyquist communication system, and is suitable for mild intersymbol interference. However, this method is difficult to approach the theoretical performance limit, especially in severe intersymbol interference Large performance loss in case of

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