Bandwidth-dependent modelling of small- scale fade depth in wireless channels
نویسندگان
چکیده
In this paper, the relation between small-scale fade depth and channel bandwidth in an indoor environment is investigated. The fade depth, a measure of the signal power variability over a local region in space, is evaluated for narrowband, wideband and ultrawide-band channels. The experimental analysis is based on frequency-domain measurements in the 3.1–10.6 GHz microwave band. Physical insight into the fading process is provided, and the effect of increasing bandwidth and temporal resolution is discussed. A dual-slope empirical model is developed, which accurately describes the relationship between fade depth and channel bandwidth. It is demonstrated that the fade depth, considered at the three standard deviation values, converges to about 4 dB at 1 GHz bandwidth, and a further increase in bandwidth yields only a marginal improvement in fade mitigation.
منابع مشابه
Fade depth scaling with channel bandwidth
Introduction: Multipath propagation in wireless channels causes random fluctuations in the signal levels, leading to small-scale fading and system outage [1]. Recent research has analysed the impact of channel bandwidth on fading using information theoretic and statistical approaches. For example, an increase in the stochastic degrees of freedom with bandwidth in frequency-selective channels ha...
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