摘要
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。
To improve fractional frequency estimation precision of the frequency-hopping OFDM （orthogonal frequency division multiplexing） system, a fractional frequency offset estimation algorithm supported by the real-time channel estimation is proposed. By means of estimating the received channel noise, the threshold logic is ensured and the high-precision fractional frequency estimation realized. The simulation results show that, in additive white Gaussian noise channel and 20dB SNR, the estimation mean-square error of the new algorithm is less than the cyclic prefix based algorithm by i0 times, while in multipath fading channel, the estimation mean-square error of the former is less than the latter by lO0 times. Experiment shows that the constellation of the present algorithm could be fairly converged.
出处
《通信技术》
2013年第5期12-15,共4页
Communications Technology
