Joint carrier frequency offset and double selective channel estimation based on EM-MAP algorithm

• Published in: Ji suan ji ying yong yan jiu Vol. 31; no. 1; pp. 269 - 272
• Main Authors: Tian, Wei, Zhong, Zi-Fa, Ge, Mei-Bao
• Format: Journal Article
• Language: Chinese
• Published: 01.01.2014
• Subjects: Algorithms; Bayesian analysis; Carrier frequencies; Channels; Complexity; Computer simulation; Inversions; Offsets
• ISSN: 1001-3695
• DOI: 10.3969/j.issn.1001-3695.2014.01.063

This paper proposed an joint carrier frequency offset and double selective channel estimation method based on EM-MAP algorithm for the problem that the OFDM systems need to obtain precise carrier offset and channel state information under double selective channel, while the existing joint CFO and channel estimation method based on Bayesian MAP algorithm was much too complex. First it used an exponential basis expansion model to solve the channel identification problem due to the fast time-varying channel. Then introduced an expectation-maximization (EM) algorithm for joint estimation of the carrier frequency offset and channel state information, which avoided large-scale matrix inversion and reduced the algorithm complexity. The simulation results prove that this method can get a similar estimation performance compared with the MAP algorithm as well as a significant reduction in complexity, which effectively solves the problem of high complexity caused by joint estimation under double selective channel and de