Signal Fading in mobile Communication (CDMA)

Abstract

In today’s knowledge-based world, wireless communication plays an important role in economic growth and well-being of people. However, because of the undesirable effects of fading on wireless channel, the information transmission is being impaired. Hence, in order to achieve reliable and effective information transfer, an effective means of reducing the fading effect on wireless channel must be found. Signals can take different paths to the receiver. These multipaths thus take different amounts of time to get at the receiver and can cause problems at the receiver. Also large-scale path loss is a function of distance fading can be caused by a variety of circumstances, such as distance from the transmitter or shadowing from large objects like mountains. This research discussed fading effects and the solutions of these effects in CDMA. Diversity technology has been observed as an effective means of mitigating the effect of fading. In this research, space transmission diversity technique and power control were studied and showed how these technique were applied to combat fading effect on wireless channel of CDMA technology.