摘要
为克服大容量散射通信系统中多径衰落特性导致的通信容量限制问题,将正交频分复用(OFDM)技术引入散射通信用来降低高速率通信带来的符号间干扰(ISI)。建立了对流层散射信道模型,从理论上对经历散射衰落信道的OFDM系统接收信号分量进行分析与计算,推导了系统的误码率,并进行了仿真验证。为了提高系统可靠性,研究了采用Reed-Solomon编码的COFDM调制方案。仿真结果表明OFDM调制方案可以有效提升散射通信容量,基于编码技术的OFDM调制方案可以满足未来军事通信需求。
As the transmission bit rate is limited for the multipath fading effect in troposcatter communication, Orthogonal frequency division multiplexing （OFDM） technique is introduced to eliminate the Inter-Symbol Interference （ISI） in high transmission system. First, the troposcatter multipath fading channel is modeled. Then, the performance of OFDM signal over tropo channel is analyzed theoretically, and the components of the received signal are investigated. Finally, the Symbol Error Rate （SER） of the considered system is achieved. To improve the SER performance, the Reed-Solomon coding technique is adopted. Simulation results show that high transmission rate is possible as the OFDM scheme is employed in troposcatter communication. With the coding technique, the SER performance of the OFDM scheme over tropo channel meets well with military communication requirements at high transmission rate.
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2013年第1期239-243,共5页
Journal of Jilin University:Engineering and Technology Edition
基金
国家自然科学基金项目(60971100)
关键词
通信技术
散射衰落信道
正交频分复用
符号间干扰
误码率
communication
troposcatter fading channels
orthogonal frequency division multiplexing （OFDM）
inter-symbol interference
symbol error rate
