基于IR-UWB系统的高速准循环LDPC编解码器设计

摘要

阐述了一种基于脉冲无线电超宽带（Impulse radio ultra‐wideband ，IR‐UWB）系统的高速低密度奇偶校验码（Low density parity‐check codes ，LDPC ）算法推导及其性能比较，分析了渐进添边算法（Progressive edge‐grow th ，PEG）结合分块准循环（Quasi‐cyclic ，QC）的方式实现校验矩阵的构造以及单位阵（ I矩阵）和Q矩阵作为子循环矩阵时的性能，并通过M atlab仿真的误比特曲线对算法进行分析。该LDPC解码器的设计采用一种基于变量因子的最小和（Minimum sum ，MS）译码算法，硬件复杂度较低，在标准U WB衰弱信道中，误码率10－6下产生约3．2 dB信噪损失。%The derivation and the performance analysis of a kind of high‐rate low density parity check (LDPC )codes algorithm are proposed for the application of impulse radio ultra‐wideband (IR‐UWB ) communication system .The PEG algorithm is combined with block quasi‐cyclic manner to construct the parity check matrix and the two different algorithms performance are compared by using the matrix I and matrix Q as the sub‐block cyclic matrix .The performance analysis is conducted with bit‐error curve from Matlab simulation .Moreover ,the minimum sum (MS) decoding algorithm based on a variable factor of the design is proposed and the final low complexity low density parity‐check code (LDPC) decoder incurs only about 3 .2dB signal‐to‐noise ratio (SNR) loss with the error rate of 10-6 bit in standard UWB fading channels .