论文部分内容阅读
为了提高跳频正交频分复用(FH-OFDM)系统载波同步估计精度,提出了一种使用信道估计结果辅助,3次迭代的载波和定时估计算法。通过对接收信道噪声的估计确定门限逻辑,实现了高精度小数倍频偏估计。仿真结果表明,20 dB信噪比时,在高斯白噪声下,新算法的估计精度高于基于循环前缀的算法10倍;在多径信道下,新算法的估计精度高于基于循环前缀的算法100倍;实验表明,使用该算法接收机性能优于基于循环前缀的算法。实验结果表明,该算法星座收敛较好。
In order to improve the accuracy of carrier synchronization estimation in FH-OFDM system, a carrier and timing estimation algorithm using channel estimation results aided and three iterations is proposed. The threshold logic is determined by the estimation of the received channel noise, which achieves high-precision fractional-frequency offset estimation. The simulation results show that the estimated accuracy of the new algorithm is 10 times higher than that based on the cyclic prefix under Gaussian white noise when the signal-to-noise ratio is 20 dB. The estimation accuracy of the new algorithm under multipath channel is higher than that based on the cyclic prefix 100 times; Experiments show that using this algorithm receiver performance is superior to the algorithm based on cyclic prefix. Experimental results show that the algorithm constellation convergence better.