A Novel MAP Estimation Algorithm for Multiple Frequency Offsets in Distributed MIMO System

Author

Wang, Qiang ; Lei, Xia ; Du, Jian ; Tian, Yuan ; Xiao, Yue ; Li, Shao-Qian

Author_Institution

Nat. Commun. Anti-interference Technol. Key Lab., UESTC, Chengdu, China

fYear

2009

fDate

24-26 Sept. 2009

Firstpage

1

Lastpage

4

Abstract

This paper addresses maximum a posteriori (MAP) estimation algorithm for multiple frequency offsets in distributed multiple inputs and multiple outputs (MIMO) system in the presence of prior information about frequency offsets. In this paper, the prior information is considered and the Cramer-Rao bound (CRB) for the problem at hand is derived. Additionally, taking advantage of prior information, the algorithm of maximum a posteriori is investigated. First, the variance of prior information can be estimated according to the range of frequency offsets. Then the MAP estimation will be used to estimate the frequency offsets. Compared with the maximum-likelihood estimation, simulation results illustrate the performance of MAP estimator achieve the CRB and the proposed algorithm can improve the efficiency of synchronization obviously, especially in low signal to noise ratio (SNR) environment.

Keywords

MIMO communication; maximum likelihood estimation; Cramer-Rao bound; MAP estimation algorithm; distributed MIMO system; distributed multiple inputs multiple outputs system; low signal-to-noise ratio; maximum a posteriori estimation algorithm; maximum-likelihood estimation; multiple frequency offsets; Communications technology; Electrochemical machining; Frequency estimation; Frequency synchronization; MIMO; Maximum likelihood estimation; Receiving antennas; Signal to noise ratio; Transmitters; Transmitting antennas;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications, Networking and Mobile Computing, 2009. WiCom '09. 5th International Conference on

Conference_Location

Beijing

Print_ISBN

978-1-4244-3692-7

Electronic_ISBN

978-1-4244-3693-4

Type

conf

DOI

10.1109/WICOM.2009.5304663

Filename

5304663