Reduction of ISI using RRC filter for Convolution codes with Viterbi Decoding

Abstract

The transmission of data over wire and wireless communication system is at high modulation rates through the band limited channel , as the signal bandwidth is more than the channel bandwidth then channel introduces a distortion is called ISI(Inter Symbol Interference) i.e. one symbol is interfere with the another subsequent symbols. This distortion is mainly caused by multipath propagation and non-linearity frequency of the channel. Even in the presence of ISI receiver must be able deliver the data to its destination. To reduce ISI we are using the pulse shaping filter is used at the transmitting and matched filter is used at the receiving end. In this paper the binary data will be pulse shaping can be achieved by RRC (Root Raised Cosine)filter transmitter as well as receive filter which does reduces the ISI and channel noise effects on the pulses transmitted over the band limited channels. Noisy base band symbols are received and first matched filtered using RRC filters ,these filtered symbols are then demodulated and symbol to bit de mapping will be done by 16-QAM (Quad rature Amplitude Modulation)demodulator. Mat lab simulation is performed.