PERFORMANCE ENHANCEMENT THROUGH INCREASING NUMBER of ANTENNAS FOR ALAMOUTI AND STBC CODES IN MIMO RF SYSTEMS

Abstract

The objective of the paper is to take advantage of the benefits of both while avoiding their
drawbacks combine transmit diversity and spatial multiplexing, thus achieving at the same time the
two possible spatial gains offered by MIMO systems. Recently many researchers have been working
on MIMO systems with STBC to improve the performance of system without additional bandwidth or
transmit power requirements. In MIMO system, the transmitter and receiver are equipped with
multiple antennas. The MIMO system provides multiple independent channels, so the channel
capacity increases linearly with the number of antennas. Space-time block codes have been shown to
perform well with Multiple-Input Multiple Output (MIMO) systems. The design aspect of wireless
system aims at improvement in spectral efficiency and coverage area with reliable performance. This
necessitates that the MIMO system must be capable to overcome data rate limitation and there must
have options open for future improvement. the STBC schemes in Rayleigh fading environment using
various combinations of numbers of transmit and receive antennas. The simulations results have
been obtained in MATLAB.