Simple correlated channel model for ultrawideband multiple-input multiple-output systems

Abstract

A simple correlated channel model for ultrawideband (UWB) multiple-antenna systems is proposed. The authors show that a single numerical value of the spatial correlation coefficient is sufficient to accurately model the performance of UWB spatial multiplexing systems in an indoor environment. The appropriate value of the correlation coefficient is selected by ensuring a close match between the bit error rate results achieved on the proposed correlated channel and those on the measured indoor channel. The authors also experimentally confirm that the performance substantially degrades in the presence of high values of spatial correlation for a range of spatial multiplexing receivers, and quantify the relationship between this degradation and the value of the spatial correlation coefficient. Thus, a route for the development of the existing standards for singleantenna UWB channels to the multiple-antenna regime is provided here.

Ultra Wideband Systems with MIMO

“…However, the study of UWB-MIMO channel models is not extensive. Until now, only some correlation properties of UWB-MIMO channels have been investigated; see [10,152,247]. In [65,114,152,155,156], the effect of antenna angular orientation and signal polarization on the system performance, which are mainly used to decrease the correlation of spatial channels, is investigated.…”

“…The simplest UWB channel model characterizing the small-scale fading is the stochastic tapped delay line (STDL) model [35] 10) where h(t) is the channel impulse response (CIR), δ is the Dirac delta function, L is the number of multipath components, τ is the sampling interval and α l is the amplitude fading in the lth delay bin. Represent α l as…”

“…Following the correlation model of narrowband MIMO channels proposed in [188], we can adopt the model [10] …”

“…In [10], it is shown that the BER performance of a MIMO system based on the simulated channel using model (2.23) gives a good approximation to the BER performance of the MIMO systems based on the measured channel if appropriate values for ρ cr and ρ ct are chosen.…”

“…Remark 2.2 Model (2.19) is a simplified mathematical model for the channel correlation, whose validity, indirectly verified in [10], needs to be further examined through extensive UWB channel measurement studies.…”