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针对交织正交频分多址(OFDMA)系统,文章提出了一种新的整数时延估计(ITDE)方法。在多径衰落环境下,由于直达径可能会被遮挡导致直达径信号非常微弱。因此,到达时间(TOA)估计的性能将会显著下降。为了提高检测首径的鲁棒性,设计了两个导频分别用来粗ITDE和精ITDE。精ITDE基于信道频率响应估计的小波分解,利用小波分解得到的门限去检测首径。通过均方根误差(RMSE)的对比,所提算法展现了优越的估计性能,并且不需要信噪比信息。
Aiming at the interleaved orthogonal frequency division multiple access (OFDMA) system, a new method of integer delay estimation (ITDE) is proposed. In a multipath fading environment, the direct path signal is very weak due to the blocking of the direct path. As a result, performance on TOA estimates will decrease significantly. In order to improve the robustness of the detection head, two pilots are designed for rough ITDE and fine ITDE, respectively. Precision ITDE based on the channel frequency response estimation of wavelet decomposition, the use of wavelet decomposition threshold to detect the first path. By comparing root mean square error (RMSE), the proposed algorithm shows superior estimation performance and does not require SNR information.