A CDMA scheme with optimum terminal filters based on channel prediction to mitigate multipath channel effects

Abstract

We consider the use of transmit and receive filters as optimum terminal filters to mitigate the effects of fading channel in frequency division duplex-code division multiple access (FDD-CDMA) systems. It is shown that the effects of multipath fading channel at the mobile receiver can be mitigated by properly designing of the filters based on the use of channel information. In order to compensate the effect of feedback delay (which is inherently present in FDD systems), a linear prediction of channel coefficients is used in the system to design the terminal filters for the current slot transmission. From the simulation results, it is shown that our proposed method performs better than that of MMSE equalizer, RAKE receiver with transmit filter (FIR-RAKE).