Time-scale domain characterization of ultrawideband 2× 2 MIMO channel and range extension for Infostation environment

In this paper, we present the time-scale domain channel characterization of the multiple-input-multiple-output ultra-wideband (MIMO-UWB) channel typical of the Infostation channel. Specifically, we consider 2 × 2 MIMO-UWB taking into account the mobility of the transceiver (time-variation). Due to the uniqueness of the time-varying UWB propagation mechanism, we consider the channel response as a time-scale domain tensor instead of a matrix, and define a time-scale domain MIMO-UWB channel representation. We use the tensor model to represent a typical Infostation channel and obtain the diversity gain, and invariably the range extension in terms of signal-to-noise ratio (SNR) for both the single-input-single-output (SISO) and MIMO cases at different data rates. Results show that at an acceptable SNR of say 12 dB and data rate of 55 Mbps, the coverage range can be extended from 15 m to well over 25 m using 2 × 2 MIMO. For 110 Mbps, the range can be extended from 10 m to 25 m. And in the case of 480 Mbps, the impact of using 2 × 2 MIMO-UWB in the range extension is not quite appreciable.