An EM-based estimation of OFDM signals

Author

Ma, Xiaoqiang ; Kobayashi, Hisashi ; Schwartz, Stuart C.

Author_Institution

Sch. of Eng. & Appl. Sci., Princeton Univ., NJ, USA

Volume

1

fYear

2002

fDate

17-21 Mar 2002

Firstpage

228

Abstract

We propose an EM-based algorithm to efficiently detect transmitted data in an OFDM system as well as estimating the channel impulse response (CIR). The maximum likelihood estimate of CIR is obtained by using channel statistics (their means and covariances) via the expectation-maximization (EM) algorithm. This algorithm can improve signal detection and the channel estimation accuracy by making use of pilot symbols to obtain an initial estimate for the iteration. Simulation results show that the bit error rate (BER) can be significantly reduced by this algorithm, and validate its good convergence and robust properties.

Keywords

OFDM modulation; convergence of numerical methods; data communication; error statistics; identification; iterative methods; maximum likelihood estimation; signal detection; transient response; BER; EM-based estimation; OFDM signals; bit error rate; channel estimation accuracy; channel impulse response estimation; channel statistics; convergence; data communication; expectation-maximization algorithm; initial estimate; iteration; maximum likelihood estimate; orthogonal frequency division multiplexing; pilot symbols; signal detection; Bit error rate; Channel estimation; Frequency estimation; Intersymbol interference; Maximum likelihood detection; Maximum likelihood estimation; OFDM; Parameter estimation; Robustness; Signal detection;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications and Networking Conference, 2002. WCNC2002. 2002 IEEE

Print_ISBN

0-7803-7376-6

Type

conf

DOI

10.1109/WCNC.2002.993496

Filename

993496