Abstract: Derived from the conventional Log-MAP decoding algorithm of turbo code and based on improving the decoding algorithm and the soft-input soft-output (SISO) decoding module, the improved SW-Log-MAP algorithm is put forward. Based on simulation, the conclusion is drawn that computational complexity and storage requirement are reduced with no performance degradation. Also, the FPGA-based design of the improved turbo decoder and implementation of the decoder are finished, which meets the requirement of the design through testing.

摘要： 本文在传统的Turbo译码算法Log-MAP的基础上，对译码算法和SISO译码模块进行了优化，得到了改进的SW-Log-MAP算法，它在保证译码性能的前提下，大大降低其运算复杂度，减少了存储空间。并且，给出了改进译码算法硬件实现的设计方案，完成了Turbo译码器的FPGA实现，通过测试证明，译码器达到设计要求。