i have a idea to do my final yr project on reducing the effect of frequency selective fading in MC-CDMA channel . i want to know that whether it has been done already , or not.
Dear Mohan,
I have attached two papers for your kind look at it. If you have more doubts feel free to ask more.
A rake filter can be used to collect the energy of the strongest multipaths, and reduce the effect of the selective fading. I've done it to improve the information theoretical capacity, two decades ago, for CDMA (Use of the RAKE Receiver to Counterbalance the Effect of Fading on the Capacity of a CDMA Channel, Proceedings of the IEEE 46th Vehicular Technology Conference - VTC'96, Pages 652-655, Atlanta, USA, May 1996).
Dear Mathan,
Frequency elective fading occurs when the bandwidth of the transmitted signal is larger than the coherent BANDWIDTH of the multi-path fading channel. The coherent bandwidth is equal to inverse of the delay time variations Tau due to the multi path.
The remedy of such frequency selective fading is adding an equalizer in the receiver.This equalizer may be frequency domain equalizer as that used in OFDM systems. If the channel is time varying then the equalizer must be adaptive.
Best wishes
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