ISI Free Filterbank Transceiver for Frequency Selective Channel with Colored Noise
The DMT(discrete multitone) transceivers have been shown to be a very useful technique for transmission over frequency selective channels. In the DMT scheme, the channel is divided into several subchannels. Bit are judiciously allocation according to the signal to noise ratio of each subchannels. So far, most of the DMT scheme are DFT based. In DFT based systems, the transmitting and receiving filters are DFT filters and have limited band separation property. For better frequency separation, filterbank transceiver has been proposed earlier in the literature. In these systems, the transceivers are obtained by interchanging the analysis and synthesis bank of perfect reconstruction filter banks. ISI is considered in the design phase. The performance is limited by the resulting ISI. In this thesis, we will design FIR filterbank transceivers that has zero ISI. Two types of designs will be considered. In type-I design, the transceivers are optimized for maximal based separation. In type-II design, transmission power is minimized for a given bit error rate and transmission rate. In this design, noise statistics is required and performance is superior to that of type-I design. Performance evaluation of both designs will be given.