Adaptive Modulation for MIMO Systems with Decision-Feedback Equalizer

Author

Ammari, Mohamed Lassaad ; Fortier, Paul

Author_Institution

Dept. of Electr. & Comput. Eng., Laval Univ., Quebec City, QC, Canada

fYear

2013

fDate

2-5 Sept. 2013

Firstpage

1

Lastpage

5

Abstract

This paper analyzes an adaptive modulation scheme for precoded multiple-input multiple-output MIMO systems with minimum-mean-squared-error decision feedback equalizer. The MIMO channel is assumed to be spatially correlated with multipath Rayleigh fading. The zero-padding technique is used to eliminate the inter-block interference. To adjust the constellation size, the signal-to-interference-plus-noise (SINR) ratio at the equalizer output is sent back to the transmitter. In this paper, we derive the probability density function of the SINR for flat fading and frequency selective channels. Then, we present accurate closed-form expressions of the spectral efficiency and the average BER. The derived expressions are compared to simulation results.

Keywords

MIMO communication; Rayleigh channels; adaptive modulation; decision feedback equalisers; interference suppression; least mean squares methods; MIMO systems; SINR ratio; adaptive modulation scheme; average BER; constellation size; flat fading channel; frequency selective channel; interblock interference elimination; minimum mean squared error decision feedback equalizer; multipath Rayleigh fading; precoded multiple-input multiple-output MIMO systems; probability density function; signal-to-interference-plus-noise ratio; spectral efficiency; zero-padding technique; Bit error rate; Fading; Interference; MIMO; Modulation; Signal to noise ratio; Vectors;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference (VTC Fall), 2013 IEEE 78th

Conference_Location

Las Vegas, NV

ISSN

1090-3038

Type

conf

DOI

10.1109/VTCFall.2013.6692082

Filename

6692082