基于IDMA系统的正交扩频并行结构设计与实现

摘要

Based on the Interleave⁃Division Multiple⁃Access system and the cross⁃correlation characteristics of the orthogonal sequence,this paper proposes a new structure with the orthogonal spreading sequences,and the traditional structure of repetition coding is replaced.On the conditions of no change of information transmission rate and less loss of the bit⁃error⁃rate performance,the new struc⁃ture reduces hardware storage resource overhead and the data length in the uplink of the base station side in comparison with the tradi⁃tional structure.The theoretical analysis and simulation results show that the new structure reduces the computational complexity and de⁃lay with less increase in the structural complexity of system.%基于交织多址系统，结合正交序列的互相关性特点，提出将正交扩频序列应用于新的系统结构中进行扩频处理，取代了传统采用重复编码进行扩频的方式。与传统方式相比，新方式在不改变信息传输速率且误比特率（ BER）性能损失很小的情况下，减少硬件存储资源开销，降低上行链路中基站端多用户检测数据长度。理论分析和仿真结果表明，提出的方案能够在较少增加系统结构复杂度的情况下，实现降低运算复杂度和时延的目的。