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提出了一种基于非相干平方律能量检测及逐符号译码的短波差分跳频系统方案,并在加性白高斯噪声(AWGN)信道与频率非选择性瑞利慢衰落信道条件下,开展了比特误码率(BER)性能的理论分析与数值仿真.数值仿真结果表明,差分跳频相邻两跳频率之间的相关性使其系统获得了一定的误跳纠正能力;对于可用频率数为4、每跳传输1比特的差分跳频系统,在AWGN信道条件下,当信噪比约为13.6 dB时,则BER可达10-5,而在瑞利衰落信道下,当信噪比约为33 dB时,则BER可达10-3.逐符号译码是一种实用的差分跳频译码算法.
A scheme of short-wave differential frequency hopping system based on incoherent square-law energy detection and symbol-by-symbol decoding is proposed. Under the conditions of additive white Gaussian noise (AWGN) channel and frequency non-selective Rayleigh slow fading channel, Bit error rate (BER) performance of the theoretical analysis and numerical simulation.Numerical simulation results show that the differential frequency hopping adjacent two-hop frequency correlation makes its system to obtain a certain degree of error-correcting capability; for the available frequency is 4, each hop transmission of 1 bit differential frequency hopping system, AWGN channel conditions, when the signal to noise ratio of about 13.6 dB, the BER up to 10-5, and Rayleigh fading channel, when the signal to noise ratio of about At 33 dB, the BER can reach 10-3. Symbol-by-symbol decoding is a practical differential hopping decoding algorithm.