نتایج جستجو برای: delay spread
تعداد نتایج: 236823 فیلتر نتایج به سال:
This document presents WINNER channel models. The channel models cover WINNER propagation scenarios for indoor, urban macro-cell and micro-cell, stationary feeder, suburban macro-cell, and rural macro-cell. Both geometric-based stochastic channel model and reduced-variability (clustered delay-line) models are presented. The channel models are mainly based on measurement data. Keyword list: Chan...
The underwater acoustic communication channel is regarded as a difficult channel, owing to its bandlimited character, long delay spread, and time variability. In order to characterize the delay-Doppler spread, in situ measurements of the time-varying impulse response are required. This can be realized by transmitting and recording dedicated probe signals such as a pseudorandom binary sequence o...
In this paper, an experimental characterization of a MIMO underground channel is presented. A simple statistical model is proposed at 2.45 GHz. The channel is characterized in terms of path loss, shadowing, RMS delay spread, and capacity. The measurements are carried out in an underground mine, which is a harsh confined environment. The path loss model is extracted from measured data for the li...
Empirical propagation characteristics of typical wireless LAN channels in the 5 GHz to 6 GHz spectrum are presented in this paper. A network analyzer was used to measure the stationary channel frequency response and an inverse Fourier transform was used to obtain the channel impulse response. Measurements were taken in four residential settings and one office/cubicle setting. Path loss and dela...
In the last lecture, two terms Average Delay and RMS Delay Spread were defined as below () () ∫ ∫ ∞ ∞ Φ Φ = 0 0 τ τ τ τ τ µ τ d d (1) () () () ∫ ∫ ∞ ∞ Φ Φ − = 0 0 2 τ τ τ τ µ τ σ τ τ d d c c (2) If the power density is discrete like Figure 1, the Average Delay and RMS Delay Spread for the multipath profile could be written in the following way: () () ∑ ∑ = k k k k k p p τ τ τ τ (3) () 2 2 τ τ σ...
A directional wideband measurement campaign was performed in urban macrocells at 2 GHz using a channel sounder and a 8-sensor linear antenna array at the base station. Directions of arrival at the Base Station (BS) were estimated by beamforming using the antenna array. Directions of arrival at the Mobile Station (MS) were estimated by beamforming using parts of the measurement route. Global par...
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