Characterization of ultra-wide bandwidth wireless indoor channels: a communication-theoretic view

TLDR

The experiment uses a >1 GHz UWB signal, yielding sub‑nanosecond path‑delay resolution without special processing. The study conducts a UWB propagation experiment in a modern lab/office building, introduces ARAKE and SRAKE receivers, and detects multipath components with a maximum‑likelihood detector. The results characterize the UWB channel, quantify multipath robustness, benchmark ARAKE as a lower‑bound RAKE design, show a complexity‑versus‑performance tradeoff for SRAKE correlators, and provide BER versus SNR curves for the SRAKE receiver.

Abstract

An ultra-wide bandwidth (UWB) signal propagation experiment is performed in a typical modern laboratory/office building. The bandwidth of the signal used in this experiment is in excess of 1 GHz, which results in a differential path delay resolution of less than a nanosecond, without special processing. Based on the experimental results, a characterization of the propagation channel from a communications theoretic view point is described, and its implications for the design of a UWB radio receiver are presented. Robustness of the UWB signal to multipath fading is quantified through histograms and cumulative distributions. The all RAKE (ARAKE) receiver and maximum-energy-capture selective RAKE (SRAKE) receiver are introduced. The ARAKE receiver serves as the best case (bench mark) for RAKE receiver design and lower bounds the performance degradation caused by multipath. Multipath components of measured waveforms are detected using a maximum-likelihood detector. Energy capture as a function of the number of single-path signal correlators used in UWB SRAKE receiver provides a complexity versus performance tradeoff. Bit-error-probability performance of a UWB SRAKE receiver, based on measured channels, is given as a function of the signal-to-noise ratio and the number of correlators implemented in the receiver.