摘要
基于对流层散射信道是多径衰落信道,会造成信号频率选择性衰落和码间干扰。研究一种重要的信号形式———交叠升余弦,给出一种基于FPGA的失真自适应相干解调的具体实现方案,并通过Matlab软件进行仿真。最后得出结论,采用交叠升余弦波形信号形式,具有一定的抗多径能力。
Multipath fading of the troposcatter channel can cause signal frequency selective fading and intersymbol interference.A kind of important signal form—frequency-diversity time-interleaved raise cosine was proposed.The paper gave an implementing of raise cosine QPSK modem by FPGA and simulated the system by Matlab software.The conclusion is that the signal form of frequency-diversity time-interleaved raise cosine has excellent performance in fighting against multipath fading.
引文
[1]李荣海,任香凝,刘莹.数字对流层散射传输技术新动向综述[J].无线电通信技术,2007,33(03):8-13.
[2]谢红,谭泽富.基于MIMO-OFDM技术的对流层散射通信系统研究[J].广西通信技术,2010,(01):19-22.
[3]张明高.对流层散射传播[M].北京:电子工业出版社,2004:28-76.
[4]李正伟,冯锦瑞,曾超,等.数字对流层散射通信链路传播可靠度工程计算[J].无线通信技术,2010,(02):41-44.
[5]陈映红.自适应均衡技术在通信中的作用探讨[J].软件导刊,2011,10(03):32-34.
[6]Freeman R L.Telecommunication Transmission Handbook(3rd edition)[M].USA:John Wiley&Sons,1991:352-354.
[7]李志勇,李文铎.二频交叠升余弦频率配置与优化过滤分析[J].无线电通信技术,2008,34(03):12-15.