64DAPSK信号性能分析及其在短波通信中的应用  

Performance Analysis of 64DAPSK Signal and Its Application in HF Communications

作　　者：杨杰[1] 杨莘元[1] 蔚娜 

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：《武汉理工大学学报（信息与管理工程版）》2007年第7期10-12,共3页Journal of Wuhan University of Technology：Information & Management Engineering

基　　金：国防科研基金资助项目(51401040703CB0102)

摘　　要：在电离层中传播的短波信号会受到多径传播、多普勒频移和扩展以及衰落的影响,这样会使信息传输的错误比特率增加。OFDM是一种能有效降低多径传播对信号影响的调制技术,而采用DAPSK调制技术可以降低接收设备的复杂度。主要分析了在不同组合方式下(16DPSK/4DASK,16DPSK/4ASK,16PSK/4DASK)64DAPSK-OFDM系统的性能,仿真结果表明,16PSK/4DASK-OFDM在AWGN信道和HF信道下都优于其他2种组合方案的64DAPSK-OFDM系统。HF transmission signals are distorted by multi -path propagation, Doppler spread and signal level fading in the ionospheric channel. In the case of digital transmission systems, the distortion of signals will cause a degradation of bit error performante. The OFDM modulation scheme can mitigate the adverse effects of muhi - path fading. And the DAPSK modulation scheme can reduce the complexity in implementation. Performance of 64DAPSK is analyzed, with three combination methods considered, such as 16DPSK/4DASK, 16DPSK/4ASK, and 16PSK/4DASK. Simulation adopted 64DAPSK -OFDM is done in AWGN channel and HF channel. And the result shows that performance of 16PSK/4DASK - OFDM is better than that of others.

关 键 词：差分编码振幅相位联合键控 正交频分复用 短波通信 

分 类 号：TN929[电子电信—通信与信息系统]