衰落信道下基于正交频率码分复用的精确时间测量

针对衰落信道下的精确时间测量，给出基于正交频率码分复用技术的高精度时间测量算法。在不降低最大不模糊时间的前提下，通过时间延时、信道衰落、相位噪声参数的联合迭代估计，有效克服了频率选择性信道的衰落与相位噪声对时间测量的影响。仿真结果表明：联合迭代算法提高了时间测量的归一化均方根误差性能。
A novel communication system based on orthogonal frequency and code division multiplexing was proposed for precise time measurement in the fading channel, and a novel iterative algorithm was proposed to improve the performance caused by the fading channel and phase noise without reducing the maximum unambiguous time. In the scheme, the coefficients of fading channel and the phase noise were jointly estimated with the time delay. It is shown both by theory and computer simulations that the proposed scheme can effectively mitigate the time estimation error caused by fading channel and phase noise.