Performance Evaluation of Space-Time Block Coding on MIMO Communication System Using Spatial Diversity

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Author(s) Olalekan Bello | Fasasi .A. Adebari
Pages 197-202
Volume 2
Issue 2
Date February, 2013
Keywords STBC, ISI, LOS, NLOS, MIMO, SNR, BER, Spatial Diversity

Wireless technology makes our life easy and comfortable. And also the demand on bandwidth and spectral availability are endless. However, the designers have got difficult task of limited availability of radio spectrum, fading, multi-path, interference, to meet the demand for high data rate [1]. The 2G and 3G standards are not good enough to satisfy the demand of high capacity. Therefore, the new standard 4G which is the successor of 2G and 3G and Broadband Wireless Access (BWA) such as WiMAX have emerged as a promising solution for providing fully broadband internet for mobile and stationary users and they use the new technology called MIMO (Multiple Input Multiple Output). In this paper analysis of 16QAM modulation scheme in AWGN and Rayleigh channels were performed using different number of transmit and receive antennas to provide spatial diversity. The single-input single-output(SISO) system was compared with the various MIMO systems using Signal-to Noise Ratio (SNR) vs Bit Error Rate (BER). Significant SNR improvement and diversity gains were achieved when the MIMO system employs the same number of antenna both at the transmitter and receiver and especially if this number is greater or equal to 2. Significant SNR improvement can also be achieved when more antennas are used at the receiver than at the transmitter to provide diversity gain, SNR improvement and higher data rate.

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