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在MB-OFDM UWB系统中,传统的信道估计方法没有充分利用信道长度这一信息,估计信道长度常大于实际长度,造成了性能损失。针对这一缺陷,提出一种新的信道估计算法。首先利用LS算法估计出信道,然后通过信号能量估计(SEE)方法估计出信道长度。算法有效地降低了估计维数,因此提高了LS算法的估计性能,同时对各算法的性能进行了分析比较。最后利用实验仿真证实了算法的有效性和分析的正确性。
In the MB-OFDM UWB system, the traditional channel estimation method does not make full use of the channel length information, and the estimated channel length is often larger than the actual length, resulting in performance loss. Aiming at this defect, a new channel estimation algorithm is proposed. First, the LS algorithm is used to estimate the channel, then the signal energy estimation (SEE) method is used to estimate the channel length. The algorithm effectively reduces the estimated dimension, thus improving the estimation performance of the LS algorithm. At the same time, the performance of each algorithm is analyzed and compared. At last, the validity of the algorithm and the correctness of the analysis are verified by experimental simulation.