A review of various BER reduction techniques in MIMO-CDMA system

Abstract

CDMA with MIMO is very good technique beyond 3G
and 4G wireless communications. CDMA with MIMO systems
give large capacitive gains and good spatial diversity. Spatial
diversity and spatial multiplexing are two main aspects to be
taken into consideration while designing communication system.
STBC block codes can be used to obtain the spatial diversity
between the symbols. Space time block coding (STBC) is the
most efficient method because it provides full spatial diversity
and simple linear decoder. If STBC and Direct-Sequence CodeDivision Multiple Access (CDMA) are combined, the
performance of multiple users in a cellular network is increased.
The BER performance of MIMO-CDMA system depends on its
spreading strategy also. System performance can be further
increased by adding coding techniques. Forward Error
Correction codes can be used to that minimizes the error
probability in decoding by adding the redundant bits
systematically. Here review of different techniques reducing BER
is presented for CDMA MIMO system.