西安科技大学学报2012，Vol.32Issue(2)：264-268,5.
可变码长的OFCDM系统及其仿真分析
Variable code length OFCDM system and its simulation analysis
摘要
Abstract
Orthogonal frequency and code division multiplexing (OFCDM) system with 2 dimensional (2D) , both to achieve frequency diversity while maintaining the time diversity, it's the future 4th generation wireless mobile communications high-speed data transmission system. In practice of spread spectrum communications, for the enough number of users and the accuracy of despreading received, spread-spectrum code required very long, so based on the existing OFCDM system, proposed a variable-length code OFCDM ( VCL-OFCDM) system, which only need to meet the spreading code length, was an integer multiple of the number of subcarriers, so the system can accommodate the increasing number of users, no longer limited by the number of subcarriers. By Matlab simulation shows that: in the time and frequency selective fading channel, VCL-OFCDM system is superior to ID system performance; at the same time, the longer the spreading code, the better the performance of VCL-OFCDM system, when the average bit error rate is 2 × 10 -4 and the number of users is 64, the spreading code is 26 × 212 for the system than the spreading code is 26 × 210 for the system can provide more signal to noise ratio gain of a-bout 4. 8 Db.关键词
扩频码长度/2维扩频/VCL-OFCDM/用户容量Key words
length of spreading code/ 2 dimensional spread spectrum/ VCL-OFCDM/ user capacity分类
矿业与冶金引用本文复制引用
张晓光,李蕾蕾,高芳,徐钊..可变码长的OFCDM系统及其仿真分析[J].西安科技大学学报,2012,32(2):264-268,5.基金项目
国家自然科学基金资助项目(60972059) （60972059）
江苏省2010年度普通高校研究生科研创新计划项目(CX10B_154Z) （CX10B_154Z）
中国矿业大学青年科研基金(0C090202) （0C090202）
