干扰消除接收机低复杂度低时延方案

摘要

干扰消除多用户检测技术复杂度和处理时延均较高,难以有效实施于未来蜂窝移动通信系统的用户端.针对此问题,利用交织区分多址(IDMA)的多址干扰消除原理,提出了一种多址干扰新方案——分组扩频交织分多址(GSIDMA).该方案通过对用户进行合理分组,可有效降低用户接收机的复杂度和处理时延.首先构建出交织扩频多址的系统模型,然后对其系统容量、复杂度、处理时延及误码率性能等进行理论分析与仿真,并对其分组方式和交织器复用等方面进行了初步探讨.分析与仿真表明,在合理的分组方式下GSIDMA的复杂度与处理时延可在IDMA的基础上进一步降低,同时其性能与IDMA接近；该方案的低复杂度、低处理时延特性使其更适于实际应用.%High complexity and latency are two of the key issues in adoption of multi-user detection ( MUD) techniques for mobile stations in cellular networks- To tackle this issue , a novel multiple access scheme based on the principle of interference cancellation of interleave-division multiple access (IDMA) , i. e. , grouped spread interleave division multiple access (GSIDMA) , was proposed. Lower complexity and latency for mobile stations were a-chieved by appropriately dividing active users into different groups. The system model of GSIDMA was constructed, followed by analysis on its system capacity, complexity and latency, and bit error rate (BER) performance. Grouping methods and interleaving reuse of GSIDMA were also preliminarily discussed. The analysis and simulations validate that the complexity and latency of the new proposed scheme are lower than those of traditional IDMA, whereas its BER performance is close to the latter. The properties of low complexity and low latency make it more feasible for practical implementation.