| One of the primary challenges in the implementation of very wideband communication systems, such as ultra-wideband (UWB) and serial-links, is the design of high-speed analog-to-digital converter (ADC). To relax the ADC requirements, the frequency channelized receiver was presented. By splitting signal spectrum into several narrower bands with mixers and low pass filters, received signals can be digitized with multiple slow ADCs. In this thesis, several channelized receiver architectures for both UWB and serial-link systems are proposed to meet various performance requirements.;A frequency channelized receiver for UWB Transmitted Reference (TR) systems is presented to keep the simplicity in channel estimation of TR systems. The proposed receiver can perform channel estimation and signal correlation in each band independently. Due to frequency separation given by analgo front-end filters, the receiver significantly outperforms the conventional receiver at presence of narrowband interference. The channelized receiver can also lead to a fast coarse acquisition procedure.;In applications of high data rate, cyclic prefix (CP) is introduced to simplify equalization structure. With CP, the propagation channel and the channelization front-end can be modeled as a circulant matrix (CM) and a block circulant matrix (BCM), respectively. Such matrix representation enables the transmitted data to be recovered by two cascaded equalizers, one of which corresponds to the channelization front-end and the other to the propagation channel. The cascaded structure is attractive as it allows fast tracking to the variations in propagation channel.;In serial-link systems, the convergence speed of adaptive algorithms is not very critical since the channel is constant. The propagation channel and channelization front-end together can be modeled as a single BCM. An adaptive algorithm of fractional spaced equalizer for serial-links is proposed targeting at very low bit error rate (BER). Several important practical issues are analyzed to show the advantages of the channelized receiver, including jitter effect, analog filter variation and quantization effects.;The above three frequency channelized receiver structures for UWB TR, cyclic prefixed UWB and serial-link systems prove the great advantages of frequency channelization in wideband receiver design. |
