摘要
作为802.16e标准OFDMA系统物理层支持的前向纠错编码方案之一,CTC信道编码方式采用双二进制循环递归系统卷积码编码器,在有效提高编码效率的同时,利用编码器的循环状态设置消除尾比特对译码性能的影响。介绍了协议中定义的CTC编码器结构及循环状态规则,并在经典Turbo码译码算法的基础上采用循环递归算法得到译码所需的循环状态条件,并在16eOFDMA系统中对算法性能进行了仿真验证。
As one of the FEC methods proposed for OFDMA physical layer of 802.16e standard, convolutional turbo coding （ CTC）, which applies a double-binary circular recursive systematic convolutional（CRSC）coder with circular state, eliminates the tail-bit influence on the decoding performance.The structure and circular state of CTC encoder in 802.16e are introduced. A kind of circular recursion algorithm for acquiring the circular state for Log-MAP decoding is provided and simulation is done to validate the performance of the proposed algorithm.
出处
《无线电工程》
2007年第2期27-30,共4页
Radio Engineering
