UWB mixed-signal transform-domain receiver front-end architectures

This paper provides the fundamental structures of a family of mixed-signal receivers constructed from the coefficients obtained from analog to digital conversion (ADC) of signal expansions of the received continuous-time signal. The receiver structures presented here are motivated from the increasing demand of high sampling rates required in broadband communication systems. To this end, this family of receivers efficiently parallelizes the ADC structure through the signal projection of the received signal onto a set of basis functions. We show that the sampling rate requirements are relaxed as the number of basis functions is increased, which introduces a trade-off between complexity and sampling rate. An example with a multiband ultra-wideband orthogonal frequency division multiplexing receiver is presented, which shows practical degrees of the trade-off between complexity and sampling rate reduction. Additionally, although the paper focuses in the design of linear digital receivers (matched filter, RAKE, MMSE, etc), an example with a nonlinear receiver based on transmitted-reference signaling is also provided.