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载波频率偏移和脉冲干扰是水声通信系统中常见的干扰形式。为了提高系统的鲁棒性,消除这两种类型干扰的影响,提出利用空载波对载波频率偏移和脉冲干扰进行估计。空载波估计技术采用了分步优化和联合优化估计两种方法。分步优化估计首先利用重采样和空载波进行载波频率偏移估计,补偿后利用空载波对脉冲噪声进行消除。考虑到载波频率偏移和脉冲噪声估计时的相互影响特性,利用二者的联合估计得到优化解。仿真和水池实验结果表明,两种优化算法都取得了良好的效果;同时联合优化估计比分步优化估计得到更大的系统性能增益,在系统误比特率为10~(-2)时,联合优化解得到了3dB左右的系统性能增益。通过对载波频率偏移和脉冲干扰的估计消除,大大提高了水声通信系统的鲁棒性。
Carrier frequency offset and impulsive interference are common forms of interference in underwater acoustic communication systems. In order to improve the robustness of the system and eliminate the influence of these two types of interference, it is proposed to estimate the carrier frequency offset and impulse interference using the null carrier. The null carrier estimation technique uses two methods: stepwise optimization and joint optimization estimation. The step-by-step optimization estimate first uses the re-sampling and the empty carriers to estimate the carrier frequency offset, and then cancels the impulse noise by using the null carrier. Considering the interaction between carrier frequency offset and impulse noise estimation, the optimal solution is obtained by the joint estimation of the two. The simulation and the experimental results show that the two optimization algorithms have achieved good results. At the same time, the joint optimization optimizes the step-by-step estimation to obtain greater system performance gain. When the system bit error rate is 10 ~ (-2) Solutions have been 3dB system performance gain. By eliminating the estimation of carrier frequency offset and impulsive interference, the robustness of underwater acoustic communication system is greatly improved.