基于概率映射的短波自适应跳频方法

短波通信以其通信距离远,设备简单等诸多优点近几年来受到越来越多的关注和应用。但是短波信道环境复杂,天波传输时受电离层电磁环境影响大,信号在传输过程中会产生瑞利衰落现象,加之各种干扰的影响,信息传输可靠性不高。自适应跳频作为抗干扰的一种有效措施,能够提高通信系统的吞吐量。自适应跳频技术应用于短波通信中以提高其抗干扰能力及通信质量。利用信噪比检测的方式,由各个信道的检测出的信噪比产生一个概率分布函数,该函数由接收方反馈到发送方。双方握手成功后,发送方按照质量好的频点选择概率大、质量差的频点选择概率小的原则选取频率集中某频点传输信息。

A Probabilistic Mapping-based Adaptive Frequency Hopping in HF Communications

HF communication,for its long communication range,simple facilities and so on,receives much attention and wide application in recent years.However,with complicated environment of HF channel,the transmitted signal would be subject to Rayleigh fading form the ionospheric EM evironment.And in addition,various other interferences,would also result in unreliable transmission.Adaptive frequency hopping,as an effective anti-jamming method,could raise the throughput of the communication system.So the adaptive frequency hopping is thus introduced into HF communication,thus to improve the anti-jamming ability and communication quality of the system.SNR of each channel is detected and mapped into a PDF in the receiver,and then this generated PDF is fed back to the transmitter.After the acknowledgement,transmitter selects one of channels to send the signal in accordance with the principle of high probability with good quality or low probability with poor quality.