An adaptive maximally decimated channelized UWB receiver with cyclic prefix

Abstract

The frequency channelized receiver based on hybrid filter bank is a promising receiver structure for ultra-wideband (UWB) radio because of its relaxed circuit requirements and robustness to narrowband interference. Maximally decimated channelizer requires the fewest number of ADCs, but it suffers from poor convergence speed, making it ill-suited for UWB systems. By applying cyclic prefix (CP) to the transmitted data, the channelizer and the propagation channel can be decomposed as a cascade of three fixed DFT related matrices and two diagonal matrices. This decomposition allows the rapidly varying propagation channel and the slowly varying channelizer to be updated at vastly different rates. An adaptive algorithm bused on minimizing the data block mean squared error (MSE) of the cascaded equalizers is also proposed. The performance is comparable to an ideal full band receiver alter initial convergence.