吉林大学学报(工学版) ›› 2014, Vol. 44 ›› Issue (5): 1512-1516.doi: 10.7964/jdxbgxb201405045

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Novel blind carrier frequency offset estimation algorithm for OFDM systems with constant modulus signaling

ZHOU You, ZHU Shi-lei, HU Han-ying   

  1. PLA Information Engineering University, Zhengzhou 450002, China
  • Received:2013-03-21 Online:2014-09-01 Published:2014-09-01

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Abstract: Carrier Frequency Offset (CFO) has great influence on the performance of OFDM system. In order to improve the accuracy of the CFO estimation, a novel blind CFO estimation algorithm is proposed for OFDM systems with constant modulus signaling. It is assumed that the channel changes slowly in time domain. The cost function based on the difference between signal powers of the two consecutive OFDM symbols in the frequency domain is derived, and the blind CFO estimation is accomplished by minimizing the cost function. Closed form solution to the proposed cost function is given theoretically, which greatly reduces the complexity. Simulation results show the performance of proposed algorithm is better than that of the classical one in high SNR circumstances, and it is robust to the changing order of channel responses.

Key words: communication technology, constant modulus signaling, orthogonal frequency division multiplexing(OFDM), blind carrier frequency offset estimation, cost function, closed form solution

CLC Number: 

  • TN929.5
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