π旋转LDPC码在MB-OFDM超宽带系统中的性能分析  

Performance Analysis of π Rotation LDPC Codes in MB-OFDM Ultra-Wideband System

作　　者：李栋[1] 尹锁柱[1] 

机构地区：[1]桂林电子科技大学通信与信息工程系,广西桂林541004

出　　处：《兵工自动化》2007年第3期80-80,共1页Ordnance Industry Automation

摘　　要：利用π旋转LDPC码设计多带正交频分复用超宽带的实现方案。系统在基带内利用基于128点FFT变换的OFDM调制解调方案。运行时,发射端的二进制消息在进行QPSK调制前利用π旋转LDPC编码器进行编码。经QPSK调制后的数据通过串/并转化器后,进行128点的IFFT变换。为制止时间域复基带信号的ISI与内载波干扰的影响,在UWB信道前加了一个循环前缀。通过仿真计算,π旋转LDPC码优于并行级联卷积码的性能。The π rotation LDPC code is adopted to design the MB-OFDM realization scheme. In basic band, system adopts OFDM modulation/demodulation scheme based on 1128 pit FFT transform. In operation, the binary information of launch end makes use of π rotation LDPC coder to code before QPSK modulation. After QPSK modulation and serials/parallel conversion device, the 128 pit IFFT transformation is carried out for data. For preventing the ISI and internal carrier wave disturbance in multi basic band signal of time filed, a cycle prefix is added before UWB channel. After simulating calculation,π rotation LDPC code is more effective than parallel cascaded convolution code.

关 键 词：LDPC码 超宽带系统 性能分析 OFDM 旋转 QPSK调制 并行级联卷积码 FFT变换 

分 类 号：TN911.22[电子电信—通信与信息系统]