In order to investigate the possibilities and problems with HF spread spectrum communication, an experimental frequency hopping (FH) system has been designed, built and tested at the National Defence Research Establishment in Sweden. The experimental system has the following basic parameters: hopping rate-1000 hop/s; data rate-1000 bit/s; modulation-noncoherent binary FSK; and the system uses 128 channels over a total bandwidth of 256 kHz. Because of jamming in a military network, it is necessary to introduce error control coding to get a good performance. Error correcting codes that are effective at high bit error rates need to be used. Performance results for block codes and convolutional codes are given.
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机译：为了研究HF扩频通信的可能性和问题，已经在瑞典国防研究机构设计，建造和测试了实验跳频（FH）系统。实验系统具有以下基本参数：跳跃速率-1000 hop / s;数据速率-1000 bit / s;调制非相干二进制FSK;系统使用256 kHz的总带宽上的128个通道。由于军事网络中的干扰，有必要引入差错控制编码以获得良好的性能。需要使用在高误码率时有效的纠错码。给出了块码和卷积码的性能结果。
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