PERFORMANCE COMPARISON OF SPACE TIME BLOCK CODE AND SPACE FREQUENCY BLOCK CODE WITH ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING IN WIRELESS COMMUNICATION SYSTEMS

Abstract

Orthogonal Frequency Division Multiplexing (OFDM) in combination with Multiple Input
Multiple Output (MIMO) is an attractive air interface solution for next generation wireless local area networks
(WLANs), wireless metropolitan area networks (WMANs), and fourth-generation mobile cellular wireless
systems. This article provides an overview of the basics of MIMO-OFDM technology and focuses on spacefrequency coding and receiver design aspects. Due to its We conclude with a discussion of relevant open areas
for further research. Use of space-frequency block coded (SFBC) OFDM signals is advantageous in highmobility broadband wireless access, where the channel is highly time- as well as frequency-selective because of
which the receiver experiences both inter-symbol interference (ISI) as well as inter-carrier interference (ICI).
ISI occurs due to the violation of the `quasi-static' fading assumption caused due to frequency- and/or timeselectivity of the channel. In addition, ICI occurs due to time-selectivity of the channel which results in loss of
orthogonality among the subcarriers. In this paper, we are concerned with the detection of SFBC-OFDM
signals on time- and frequency-selective MIMO channels. Specifically, we propose and evaluate the
performance of an interference cancelling receiver for SFBC-OFDM which effectively alleviates the effects of
ISI and ICI.