摘要
针对航空通信中各种干扰导致的高误码率问题,对有无直接链路的情形分别提出多机协作通信提高分集增益的方法.该方法在机载通信设备调制技术和发射功率不变的条件下实现了高速率传输,有效抵抗多径衰落,扩大通信范围.通过分析VHF信道中是否存在直接链路,给出了基于航空信道模型的放大转发和解码转发协作通信方式,用最大比合并的方法提高了接收端的信噪比.仿真结果表明,在给定的空空和空地信道参数下,在直接链路存在下多机DF协作的误码性能最优,在无直接链路存在下多机AF协作的误码性能最优.
In view of the high BER （Bit Error Rate） caused by a variety of interference in the aeronautical communications, this paper proposes the multi-aircraft cooperative communication scheme for the case that a direct link does or doesn＇ t exist separately to improve the diversity gain in aeronautical channel. The proposed scheme could achieve high data rate, effectively resist multi-path fading, and expand the communication range in conditions of fixed airborne communication equipment modulation and constant transmission power. By ana- lyzing whether there is a direct link for transmitting signals in VHF channel, we give both the amplify-and-for- ward and decode-and-forward cooperative communication mode based on the model of aeronautical channel. What＇ s more, the maximum ratio combining method is utilized to improve the SNR （ Signal to Noise Ratio） at the receiving end. Simulation results show that the multi-aircraft DF has optimal performance of BER when di- rect link exists, and the multi-aircraft AF has optimal performance of BER when direct link does not exist, when the parameters of air-to-air and air-to-ground channels are given.
出处
《郑州大学学报（工学版）》
CAS
北大核心
2013年第4期110-114,共5页
Journal of Zhengzhou University（Engineering Science）
基金
国家自然科学基金资助项目(61172086)
关键词
航空信道
放大转发(AF)
解码转发(DF)
多机协作通信
aeronautical channel
amplify-and-forward （AF）
decode-and-forward （DF）
multi-aircraft co-operative communication
