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The era of wireless communication is rapidly increasing in our day-to-day lives. The main aim of 4G wireless systems is to provide users with high speed and high performance in different channel conditions. 4G systems support interactive multimedia, voice, streaming video, internet and other broad band services. 4G is a IP based mobile system with high speed, high capacity and low cost per bit. Orthogonal...
Multipath fading is inherent in wireless communication systems. Diversity is the techniques which takes the advantage of multipath and mitigate the effect of fading and increase signal strength. Space Time Block codes (STBC) are used in MIMO systems to improve the performance by maximizing transmit and/or receive diversity. Among different schemes based on STBC, Quasi orthogonal space time block code...
This paper focus on how to design the location of transmit antennas for Multiple-Input Multiple-Output (MIMO) space-time coding architecture with distributed transmit antennas. Considering the effects of path loss, correlated shadowing, multipath fading and white Gaussian noise, we first derive the approximate area averaged symbol error rate (AASER) in a circular cell at high signal-to-noise ratio...
We propose a new closed-loop transmit diversity scheme for multiple-input-multiple-output (MIMO) diversity systems based on orthogonal space-time block coding (OSTBC). The receiver of the proposed scheme checks the output signal-to-noise ratio (SNR) of the space-time decoder against an output threshold and requests the transmitter to replace the transmit antenna resulting in the poorest path with...
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