吉林大学学报(工学版) ›› 2014, Vol. 44 ›› Issue (01): 253-258.doi: 10.13229/j.cnki.jdxbgxb201401041

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OFDM channel estimation based on pseudo random postfix

CUI Jin, ZHANG Bo, ZHANG Yan-zhong   

  1. School of Electronic and Information Engineering, Beihang University, Beijing 100191, China
  • Received:2013-05-23 Online:2014-01-01 Published:2014-01-01

Abstract:

A new model of orthogonal Frequency Division Multiplexing (OFDM) system based on pseudo-random-postfix was proposed. In view of the requirements of channel estimation under slow time-varying channel, a channel estimation method based on first-order statistics and a low-complexity equalization using the property of circular matrix diagonalization were proposed. The performance of Bit-Error-Rate (BER) was simulated and analyzed under the Additive-White-Gaussian-Noise (AWGN) channel, frequency selective fading channel and Doppler channel. The simulation results show that the proposed method can be applied to the slowly time-varying channels, such as the slow-moving case, and can achieve better BER performance than the traditional Cyclic Prefix (CP)-OFDM. However, the performance may get worse for the Doppler scenarios.

Key words: communications, orthogonal frequency division multiplexing (OFDM), channel estimation, pseudo random postfix, circulant matrix

CLC Number: 

  • TN929.5

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