MINIMIZATION OF BIT ERROR RATE IN WCDMA MULTIPATH CHANNEL USING MULTIPLE FINGER RAKE RECEIVER

Abstract

Multipath signals which are time-delayed versions of the base station signals were combined using RAKE receiver in wideband code division multiple access (WCDMA) channel. This combination was necessary in order to improve the signal to noise ratio (SNR) thereby reducing the bit error rate (BER) at the receiver. Multiple numbers of RAKE fingers were used to reduce the effect of multipath transmission. Multipath signals were generated as input to the RAKE receiver system. Matched Filter (MF) type of correlators was used to perform the impulse response measurement (IRM). The output symbols from RAKE fingers are multiplied with complex conjugate of the channel estimate and summed together using maximal ratio combining (MRC) diversity technique. The bit error rate (BER) and output SNR were measured to determine the performance of the system