Realization method of generating soft decision metric in turbo-stbc system

Abstract

The invention provides a method for generating LLR soft decision measurement in a Turbo-STBC system, wherein the Turbo-STBC system is composed of two transmitting antennas and two receiving antennas. The method is achieved through the fact that an LLR generator module is designed to be arranged on an FPGA. In a Turbo-STBC cascade system, an LLR generator enables baseband signals of a receiving end to be decoded through an STBC decoder and then inputs the baseband signals to an LLR arithmetic unit for calculations, and generated LLR soft decision measurement is used as the input of a follow-up Turbo soft decision decoder for conducting Turbo decoding. When an internal arithmetic module is designed, a parallel arithmetic idea is completely used, and the throughput of the system is improved. A hardware reusing technology is used in the design of the STBC decoder, the arithmetic unit function is guaranteed to be achieved, and meanwhile the consumption to hardware resources of the arithmetic unit is saved. A simple algorithm is used in the design of the LLR arithmetic unit, and compared with a traditional algorithm, the complexity for achieving arithmetic unit hardware is lowered.

Description

technical field [0001] The present invention relates to the field of wireless communication, and more particularly relates to a method for realizing the generation of LLR (LoglikelihoodRatio, logarithmic likelihood ratio) soft decision metric in a Turbo-STBC (SpaceTimeBlockCode, space-time block code) system. Background technique [0002] As a channel coding scheme that can approach the Shannon limit, Turbo codes are widely used in wireless communication systems due to their excellent performance. Turbo codes organically combine convolutional codes and random interleavers to achieve random coding. The decoder passes Using soft-input and soft-output iterative decoding to approximate maximum likelihood decoding can obtain higher decoding gain. [0003] STBC is a MIMO (Multiple Input Multiple Output, Multiple Input Multiple Output) multi-antenna system commonly used transmission diversity coding method, the coding method is simple, and when cascaded with the outer code with a l...

AI Technical Summary

Problems solved by technology

The method is designed and implemented based on the FPGA (Field Programmable Gate Array, Field Programmable Logic Gate Array) platform, including the STBC decoding module and the LLR soft decision measurement generation module, which respectively realize the STBC decoding and LLR operation, and adopts a simple algorithm when designing the LLR generation module , which solves the problem of high hardware implementation complexity of the traditional LLR algorithm

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