Performance Enhancement of MIMO OFDM for Higher Spectral Efficiency

The Multiple-Input Multiple-Output based wireless system is a promising high data rate interface technology. Diversity methods provide the receiver with independently faded copies of the transmitted signal with the expectation that at least one of these replicas will be received data. This is ranges of techniques available through which these faded copies can be recovered and used as part of arrangements. This paper proposes a method based on Multiple-Input Single-Output (MISO) with Space-Time Block Coding (STBC) and Multiple-Input Multiple-Output (MIMO) set-up for use in wireless channels. A special of STBC called Alamouti code is used for exploiting in the performance of MISO and MIMO in frequency selective fading environment. The observed with and without STBC in frequency selective faded channels. The diversity gain of MISO and MIMO systems in terms of BER for High QAM modulation scheme. The obtained results demonstrate that spatial diversity along with the power of STBC significantly improves the error performance in frequency selective wireless fading channels. These techniques offer a significant gain over a traditional single input single output (SISO) channel.