This paper presents a comprehensive overview of Ultra-Wideband (UWB) measurements of all the empirical data available on various fading properties of the indoor radiowave communication channel. Our focus is on the essential propagation channel parameters which is used in the physics-based models. This overview is based on more than 50 measurement campaigns from 24 working groups in different co...

A method is presented to determine the diversity gain achieved by increasing the hopping rate in a frequency hopped spread spectrum system using frequency mean square correlation (FMSC). In particular, it is demonstrated that the detailed shape of the delay power profile of a given channel does not play a fundamental role in the determination of the performance saturation point given the FMSC o...

Underwater acoustic channel makes high data rate transmission a very challenging task, due to the extended multipaths delay spread and large Doppler spread [1]-[2]. To increase the data rate or spectral efficiency of underwater acoustic communication, people resort to the spatial structure of the oceans by employing multiple-input, multipleoutput (MIMO) technology. With MIMO technology, very hi...

In frequency selective channel, some frequencies may be in deep fade. Inherent frequency diversity in multilevel frequency shift keying is exploited by a coding technique called permutation code, which ensures that the frequencies occur equally often. Information bits are uniformly spread over the frequency band. The performance of permutation codes and 4FSK in terms of bit error rate is compar...

This paper describes a method of deriving channel parameters for a time-dispersive (=frequency-selective) radio channel from simple wide-band power measurements. A novel relationship is found allowing the estimation of the root-mean-square (rms) delay spread from such data. Furthermore, we describe a set of equations that can be used for fitting the (measured) channel parameters to a mathematic...

This paper presents the results of narrow-band and wide-band propagation measurements carried out at 2.0 GHz in an indoor environment using a radiated-mode leaky feeder as the transmitting antenna. The narrow-band measurements were devised to measure attenuation of radio signals and the wide-band techniques to measure multipath impulse responses and their associated root mean square (rms) delay...

In this paper, we propose a new method of morphology classification considering the building height, density, etc. The characteristics of path loss, delay spread(DS), angular spread(AS) of Angle of Departure(AoD) and Angle of Arrival(AoA) for each morphology were investigated by analyzing the simulation results obtained by the ray-tracing technique and a statistical modelling of the building di...

A general stochastic spatial MIMO channel model is proposed for evaluating various MIMO techniques in this paper. It can generate MIMO channels complying with various MIMO configurations such as smart antenna, spatial diversity and spatial multiplexing. The modeling method produces the stochastic fading involving delay spread, Doppler spread, DOA (direction of arrival), AS (angle spread), PAS (...

In this letter, the performance is compared for slowfrequency-hop and direct-sequence spread-spectrum packet communication systems of similar complexity with doubly selective fading channels characterized by several different multipath delay profiles and Doppler spreads. The delay profiles are chosen to reflect experimental measurements of mobile-radio channels, and the Doppler spreads are chos...

This paper presents results from an experiment that used a variety of antennas inside two buildings. A profound result is that directional circularly-polarized (CP) antennas reduce rms delay spreads when compared with omni-directional and directional linearly-polarized (LP) antennas at identical locations. The variation of rms delay spread over distances of several wavelengths is also greatly r...