Ranging Implementation Using Finite-Resolution Digital Receiver for IEEE 802.15.4a Systems

The ranging implementation for IEEE 802.15.4a systems usually requires for high sampling rate high resolution ADCs, which are too complicated and power-hungry for realization. Recent methods have been proposed to make tradeoffs, such as limiting amplitude resolution to a few bits, which results in finite-resolution quantization receiver. In this paper, the influence of the low-bit quantizer on UWB time-of-arrival (TOA) estimation is investigated. Likelihood ratio test (LRT) and involved generalized Neyman-Pearson lemma are used to optimize the TOA estimation performance. Several types of the low-bit and full-resolution digital receivers are compared via Monte Carlo simulation. We demonstrate that our scheme provides obvious superiority than the traditional uniform quantizer with little complexity increase. Furthermore, 3-bit receiver is proved good enough since it can approach the performance bound achieved by the full-resolution receiver.