基于扩频OFDM宽带短波通信系统性能仿真  

Simulation of wideband HF system model based on OFDM-CDMA

作　　者：赵旦峰[1] 杨泽亮 叶建超[1] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《应用科技》2009年第10期8-11,共4页Applied Science and Technology

基　　金：重工集团科技预研基金资助项目(06J3.4.1)

摘　　要：宽带短波信道为衰落色散信道,为了克服信道的多径效应,适应高速数据传输,方案采用了OFDM调制方式.同时应用了扩频技术提高短波通信系统的抗干扰能力和安全保密能力.为了获得良好的频域和时域分集效果,提高系统在宽带短波信道出现深度衰落情况下的误码率性能,最终确立了基于时频映射的二维扩频系统作为OFDM-CDMA的结合方案.提出的二维扩频通信系统在宽带短波信道条件下,性能优于传统的扩频通信系统;在满足一定通信质量的要求下,最高可以实现32kbps的数据传输速率.The wideband HF channel is a fading and time-dispersive channel. In order to overcome the multi-path effect and increase the rate of transmission, the system adopts orthogonal frequency-division multiplex （ OFDM ） modulation. At the same time, the code division multiple access （CDMA） is used to meet the requisition of resisting interferences and information security. Furthermore, in order to obtain good performances of diversity reception of frequency domain and time domain, the system also adopts time-frequency two-dimensional spreading for improving the performances of BER. These results of theory-analysis and Monte Carlo simulation prove the proposed system work well in the wideband HF channel.

关 键 词：宽带短波信道 正交频分复用 码分多址 二维扩频 

分 类 号：TN742.1[电子电信—电路与系统]