MIMO System Performance Evaluation for High Data Rate Wireless Networks using Space Time Block Codes with Orthogonal Structure
Journal Title: International Journal of Modern Engineering Research (IJMER) - Year 2014, Vol 4, Issue 6
Abstract
Space–time block coding is used for data communication in fading channels by multiple transmit antennas. Message data is encoded by applying a space–time block code and after the encoding the data is break into ‘n’ streams of simultaneously transmitted strings through n transmit antennas. The received signal at the receiver end is the superposition of the n transmitted signals distorted due to noise .For data recovery maximum likelihood decoding scheme is applied through decoupling of the signals transmitted from different antennas instead of joint detection. The maximum likelihood decoding scheme applies the orthogonal structure of the space–time block code (OSTBC) and gives a maximum-likelihood decoding alorithm based on linear processing at the receiver. In this paper orthogonal space–time block codes based model is developed using Matlab/Simulink to get the maximum diversity order for a given number of transmit and receive antennas subject with a simple decoding algorithm.The simulink block of orthogonal space coding block with space–time block codes is applied with and without gray coding. The OSTBC codes gives the maximum possible transmission rate for any number of transmit antennas using any arbitrary real constellation such of M-PSK array. For different complex constellation of M- PSK space–time block codes are applied that achieve 1/2 and 3/4 of the maximum possible transmission rate for MIMO transmit antennas using different complex constellations.
Authors and Affiliations
Sandeep Narain, Dr. Syed Hasan Saeed
Keywords
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