【摘要】 为设计并实现宽带无线接入系统的差错控制,基于无线本地城域网标准IEEE802.16a,提出了三种TCM码的译码方案.通过理论分析对比了各算法的实现的难易程度,采用定点运算进行计算机仿真,获得了不同码型各译码方案的误比特率性能曲线.理论分析和仿真结果说明,不存在绝对优异的方案.最后给出标准中具体码型的方案选择.更多还原

【Abstract】 With the aim of designing and implementing the error control part in the wideband wireless access system, three decoding methods for TCM codes are proposed based on the wireless metropolitan standard IEEE 802.16a. The difficulties in the implementation of the decoding algorithms are then theoretically analyzed and compared. Moreover, computer simulation with fix-point computation is carried out, thus obtaining the curves of the bit error rate performance of the decoding algorithms for different TCM codes. The theoretical and simulated results indicate that there is no best algorithm for the decoding of TCM codes. The specific decoding methods for different TCM codes in the standard are presented at the end of the paper.更多还原