Performance analysis of a wireless communication network using MIMO system

Abstract

The rate at which data transmits from source to destination is a major aspect of wireless communication networks. It is desirable to transmit data bits with no possible errors but due to channel constraints and system designing; bit error occurs thus the users cannot get the information at their desired speed. In this paper, the methods for improving bit performance of a multiple input multiple output communication system is investigated. By using space time block coding at the transmitter side of MIMO we can significantly improve bit performance by reducing inter symbol interference. Side by side the effect of maximum ratio combining at the receiver side to improve bit rate was also studied. Antennas of wireless communication systems are battery limited, so it is important to allocate power efficiently. In this regard, water filling algorithm for power allocation was investigated. Waterfilling algorithm uses Singular value decomposition method to decompose MIMO channel matrix into parallel sub channels. After knowing the noise information gain of parallel sub channel gains, power is allocated accordingly to ensure power efficiency. Later, effect of different modulation scheme on Alamouti STBC MIMO system was investigated. It was found that high order modulation schemes has a better throughput but bad bit performance than a lower order modulation schemes.