Joint TOA and AOA/AOD Spectrum for Ultra-Wideband Indoor Double-Directional Channel Estimation

This paper presents an ultra-wideband (UWB) double-directional channel sounding technique using transformation between time domain (TD) and frequency domain (FD) signals. We proposed the time-of-arrival (TOA), angle-of- arrival (AOA) estimation algorithm and angle-of-departure (AOD) with some modifications of our previous work. There were four main advantages of the proposed estimation technique as follows: implementation of the simple antenna array with fixed element spacing; the TOA estimation using a peak search over TD signals with high resolution; the angle estimation using the multiple signal classification (MUSIC) and angle histograms over FD signals; pairing the TOAs and the AOAs precisely. We develop the joint TOA and AOA/AOD spectrum for the double-directional channel. Although the level does not indicate true power but the weighted spectral peaks based on the TD signals and the weighted occurrence ratio of the MUSIC spectrum, the level distributions including dominant multipath components predicted by ray-tracing can be viewed as clusters for both line of sight (LOS) and non-LOS environments.