World Journal of Engineering Research and Technology

Srishti Nema* and Dheeraj Nagar

ABSTRACT

Now-a-days the requirements the increase in the number of wireless devices and the requirement for higher data rates places an increasing demand on bandwidth. The advance generation of wireless communication systems faces the demand for increased higher mobility data rates, larger carrier frequencies, and more link reliability. Wireless channels are characterized by diversity, fading, multipath, limited bandwidth, and frequency and time variant, time invariant selectivity which make system design a challenges. This necessitates the need for communication systems with increased throughput and capacity. The requirements of wireless communication are to have high voice quality, high data rates, high voice quality multimedia features, lightweight communication devices etc. But the wireless communication channel suffers from much impairment. One of them is fading which is due to the effect of multiple propagation paths, and the rapid movement mobile communication devices. In a typical wireless communication atmosphere, multiple propagation paths often exist from a transmitter to a receiver due to scattering by different objects. Signal copies following different paths can undergo different attenuation, distortions, delays and phase shifts. Thus this is necessary to reduce the difficulty of fading, but not at the cost of additional bandwidth. One efficient solution is proposed for wireless system named diversity, without the requirement of extra bandwidth. This thesis deals with the BPSK modulation and AWGN channel to overcome the effect of fading diversity is used at the transmitter to get good signal at the receiver diversity. This technique is used to improve the performance of the radio channel.

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