Abstract
The research and development of wireless communication systems for high speed reliable transmission has become one of the new challenging subjects in the telecommunication area. Multiple-input multiple-output (MIMO) is a reliable technology that employs multiple antennas at both the transmitter and receiver sides, and represents a potential solution to the above mentioned demand. Conventional smart antenna techniques can be regarded as a special form of MIMO, which main technique is beamforming. Recent researches on MIMO techniques can be categorized into two major types: one is spatial diversity (SD) and the other is spatial multiplexing (SM). In a wireless transmission environment, the transmitted signal is scattered by various environmental objects (buildings, trees, mountains, etc) causing different multi-path fading effects. With this point of view, we here consider a wireless communication system combining smart antenna and MIMO techniques. Depending on the channel condition, the optimal transmission technique will be selected to combat channel impairments. We also propose an adaptive MIMO transceiver architecture to dynamically adjust the transmission parameters such as space-time processing mode and modulation order, according to the instantaneous channel statistics, to meet the target error rate and data rate. Finally, the performance of the proposed transceiver is verified using computer simulations in different wireless communication environments.