Performance of Space-Time Block Coded MIMO Systems for Cell Edge Users in Rayleigh Fading Channel

Abstract

Multiple Input Multiple Output (MIMO) systems have become the integral part of today's modern wireless communication system. The major problem observed in cellular structure is to provide the proper service to the users at the boundary of the cell. To increase the capacity of cell, it is essential to put the multiple antenna systems at the base station and even at user equipments. Space-time block codes are a remarkable modulation scheme discovered recently for the multiple antenna wireless channels. Multiple transmit and receive antennas can be used in wireless systems to achieve high data rate communication. Recently, efficient space-time codes have been developed that utilize a large portion of the available capacity. These codes are designed under the assumption that the transmitter has no knowledge about the channel. Multi-antenna systems can be used for increased capacity or for increasing diversity order, but the cost paid for deriving these benefits is increased hardware complexity due to multiple antennas and the number of RF (Radio Frequency) chains. This paper focuses on to implement the MIMO system in cellular structure at both base station and user equipment in order to boost the overall capacity of the system. It is seen that the capacity of the system increases with increase in number of antennas at the BTS end.