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本文对OFDM系统中广泛应用的一种导频辅助的信道估计器-2×1-D维纳滤波器进行了改进,以ML信道估计代替了其中的频域滤波,并将改进的估计器与2×1-D维纳滤波器在IEEE 802.16e OFDM系统中的BER、MSE性能及计算复杂度进行了比较。仿真结果表明,在802.16e OFDM系统下,改进的估计器能够以较低的复杂度达到优于2×1-D维纳滤波器的性能。此估计器也可以应用于其他基于导频估计的OFDM系统。
In this paper, a pilot-aided channel estimator-2 × 1-D Wiener filter, which is widely used in OFDM systems, is improved. ML channel estimation is used instead of frequency domain filtering, and the improved estimator is compared with The BER, MSE performance and computational complexity of 2 × 1-D Wiener filters in IEEE 802.16e OFDM systems are compared. The simulation results show that under the 802.16e OFDM system, the improved estimator can achieve better performance than the 2 × 1-D Wiener filter with lower complexity. This estimator can also be applied to other OFDM system based on pilot estimation.