An Optimum Sub-Channel Weighting Scheme for MIMO-OFDM Wireless System

Author

An, John ; Liu, An-Kuo

Author_Institution

Nat. Taiwan Ocean Univ., Keelung

fYear

2007

fDate

3-7 Sept. 2007

Firstpage

1

Lastpage

5

Abstract

In this paper, an optimum sub-channel weighting (OSW) scheme for multiple-input multiple-output with orthogonal frequency division multiplexing (MIMO-OFDM) wireless receiver design is proposed to enhance the signal-to-noise ratio (SNR) with time-varying fading channels. The Bayes decision algorithm is implemented to calculate the spatial sub-channel weighting factors, where the M-likelihood optimum decisions for the received signal thresholds are determined. Instead of optimal waterpouring power allocation, this scheme effectively increases the mean SNR value invoked with an optimum channel covariance under total transmitted power constraint. Eigen-analysis shows that the cumulative distribution function (cdf) of the eigenvalues generated using the optimum decision rule is considerably better than that of the original one even in the presence of spatial correlation across antennas and maximum Doppler frequency.

Keywords

Bayes methods; MIMO communication; OFDM modulation; eigenvalues and eigenfunctions; radio receivers; time-varying channels; Bayes decision algorithm; Eigen-analysis; M-likelihood optimum decisions; MIMO-OFDM wireless system; SNR; cumulative distribution function; maximum Doppler frequency; multiple-input multiple-output; optimal waterpouring power allocation; optimum channel covariance; optimum subchannel weighting scheme; orthogonal frequency division multiplexing; signal-to-noise ratio; time-varying fading channels; wireless receiver; Antenna arrays; Antennas and propagation; Covariance matrix; Eigenvalues and eigenfunctions; Fading; MIMO; OFDM; Radio transmitters; Receiving antennas; Transmitting antennas;

fLanguage

English

Publisher

ieee

Conference_Titel

Personal, Indoor and Mobile Radio Communications, 2007. PIMRC 2007. IEEE 18th International Symposium on

Conference_Location

Athens

Print_ISBN

978-1-4244-1144-3

Electronic_ISBN

978-1-4244-1144-3

Type

conf

DOI

10.1109/PIMRC.2007.4394761

Filename

4394761