Logarithm field simplification decoding algorithm based on prime time space symbol Turbo code

Abstract

The present invention provides a Turbo code logarithm domain simplifying decoding algorithm based on unitary space-time symbol. The algorithm processes in the logarithm domain based on the unitary space-time symbol Turbo code MAP decoding algorithm, adopts an approximate calculation formula of taking the logarithm after summation, thereby avoiding the exponential and logarithm arithmetic, and simultaneously converting the summation arithmetic into the maximizing arithmetic, converting the integration arithmetic into the summation arithmetic. Under the precondition of few performance sacrifice, the decoding calculation amount can be greatly reduced, more iterative number can be realized, and the memory overflow problem is avoided. As the memory overflow is avoided, the decoding can execute more iterative number, thereby discovering the iterative limit. Through the simplifying algorithm has part of performance loss with identical iterative number, more iterative number can be used to compensate the performance loss, because the simplified interpretation method can execute more iterative number and the calculation complexity is in a linear relationship with the iterative number.

Description

Technical field [0001] The invention relates to a simplified decoding method for multi-ary Turbo codes in a MIMO (multiple input multiple output) system when there is no channel state information, which can be used as a selection criterion for realizing normal communication under high-speed mobile conditions in the next generation wireless communication system . Background technique [0002] The main task of wireless communication is to meet the increasing requirements of users for high data rates and high reliability. However, the wireless spectrum resources suitable for mobile communication have become very tight. Space-time code technology that can utilize space resources is a more preferable option. Remedy. The classic space-time code technology requires channel state information (CSI) to be known at the receiving end. However, when the fading rate is very fast, the channel estimation of the MIMO system will become very difficult or occupy a lot of useful resources. The Europ...

AI Technical Summary

Problems solved by technology

This method can improve the bit error performance of the MIMO system under the condition of no channel state information and low signal-to-noise ratio, but it has very high requirements for the calculation and storage of the system, and the calculation and storage are too large, which can easily lead to storage "overflow". ", the current hardware can not achieve

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