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Study and Simulation of Space Diversity Techniques for Wireless Communications

Multipath fading is constantly limiting and challenging the ability to achieve the full potential of wireless communications. As transmitted power is regulated and bandwidth is precious, there's need for techniques which requires no additional bandwidth and transmitted power. Diversity techniques are powerful techniques that utilize two or more copies of a signal and combine those signals to combat multipath fading.

Among many diversity techniques space diversity technique is very attractive because of its simplicity and bandwidth efficiency. Space diversity can be implemented in both the transmitting end as well as the receiving end. The receive diversity is in practice for a number of years but the transmit diversity scheme came into the limelight with the publication of a paper published by Alamouti in 1998. This report provides a detail explanations of space diversity technique verifies the scheme proposed by Alamouti. The emergence of transmit diversity led to the evolution of multiple input multiple output (MIMO) systems. The decoding section is an indispensable part of MIMO systems. This report compares the bit error rate (BER) performance of various MIMO decoding schemes like maximum likelihood (ML), Minimum Mean squared error (MMSE) and Zero forcing (ZF) by through simulations.

Finally, when there is a presence of strong line of sight (LOS), Ricean fading channel is appropriate for modelling the channel. This fact motivated the comparison between the MIMO decoding schemes under Ricean and Rayleigh channel environments in this report.


  • Ajay Kumar Kadel
  • Suraj Man Maharjan
 

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