نتایج جستجو برای: multipath channel
تعداد نتایج: 229281 فیلتر نتایج به سال:
MIMO (Multi Input Multi Output) wireless communication system is an innovative solution to improve the bandwidth efficiency by exploiting multipath-richness of the propagation environment. The degree of multipath-richness of the channel will determine the capacity gain attainable by MIMO deployment. Therefore, it is very important to have accurate knowledge of the propagation environment/radio ...
Tigris River is an environment of shallow waters because its low depth and it has been identified as a multi-path channel. The underwater propagation leads to reverberation well fading, which causes large transmission loss. present paper conducts 3 acoustic simulation outcomes in the district Abu Dali - Kazem Al Ali village beaches Baghdad Iraq. distance from sender receiver are (100m, 1000 m, ...
This paper proposes a stochastic multipath model useful for generating MIMO channel matrices in timevariant environments. The multipath model is developed by first extracting the relevant characteristics from measured indoor channel data and subsequently capturing these characteristics in an auto-regressive stochastic model. This model is then used to generate channel matrices whose space-time ...
In this article, we investigate the Shannon capacity for L-branch maximal combining ratio (MRC) over generalized multipath fading channel. We derive closed-form expressions of the maximal spectral efficiency over Rayleigh, Rician, Nakagami-m, and Weibull multipath fading channel under flat fading conditions. The results are expressed in terms of Meijer G-functions, which can be evaluated numeri...
A narrowband channel model for multipath fading in aeronautical telemetry applications is described. This channel is composed of a line-of-sight signal, a specular reflection whose strength is 20% to 80% that of the line-of-sight signal, and a diffuse multipath component whose power is 10 to 20 dB less than that of the line-of-sight signal. Thus the channel is close to additive white Gaussian n...
Due to multipath fading and inter-symbol interference, the high speed transmitted data extends to several symbol periods. Signals which travel through several paths get reflected by different objects and signals taking less direct path arrive at receiver later and are often attenuated. Traditional systems employ some improvement techniques to deal with multipath signals; one technique is to use...
Frequency-offset correction is considered for a HIPERLAN (HIgh-PErformance Radio LAN) system over the indoor radio channel. Since the multipath channel response is not known a priori, a viable frequency-offset estimator should not depend on such knowledge. Such an estimator, using a single sample per symbol, is derived for HIPERLAN. The estimator is shown to approach the Cramer–Rao bound for fr...
A/M~Tw!,In this paper, a multicarrier DS/CDMA system with adaptive antenna array is proposed for a multipath fading channel. A multipath fading channel is modeled as a Nakagami-m fading channel. The performance is evaluated in terms of bit error probability, and system capacity for the multicarrier DS/CDM A system with adaptive antenna array is estimated. From the analytic and simulation result...
Executive Summary This guided research project aim to develop a better understanding of the operational characteristics of an OFDM system under multipath conditions. During the course of the project a Rayleigh fading multipath channel model was developed and used to test the performance of the cyclic guard prefix method of avoiding ISI in OFDM systems. During the next phase of the project, a st...
This paper describes the development and operation of a dual-band time~domain radar system used to measure indoor multipath propagation characteristics in several office buildings and factories. The system operates at 1.3 GHz and 4.0 GHz, and uses 4 ns rms pulses to provide estimates of indoor radio channel impulse responses. The effects of ante.nna diversity, .frequency scaling, and topography...
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