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功率时延剖面(PDP)可完全刻画无线信道的时间散射特性,同时也是栅格正交频分复用系统(LOFDM)自适应策略的重要信道参考。实际中,由于功率时延剖面的准确估计十分困难,常用时延扩展来描述信道功率时延剖面。文章利用Parseval’s定理和DFT-BEM信道模型实现了双散射信道下时延扩展的有效估计;同时运用抛物线拟合法进一步提高估值算法抗干扰性能。理论分析与计算机仿真表明:提出估计算法具有良好的均方误差性能。
The power-time profile (PDP) can completely characterize the time-scattering characteristics of the wireless channel and is also an important channel reference for the adaptive strategy of the grid orthogonal frequency division multiplexing (LOFDM) system. In practice, due to the difficulty of accurately estimating the power-delay profile, the delay spread is often used to describe the channel power-delay profile. In this paper, Parseval’s theorem and DFT-BEM channel model are used to effectively estimate the delay spread in dual-scattering channels. At the same time, parabolic fitting method is used to further improve the anti-interference performance of the estimation algorithm. Theoretical analysis and computer simulation show that the proposed algorithm has a good mean square error performance.