نتایج جستجو برای: fading
تعداد نتایج: 19732 فیلتر نتایج به سال:
The Nakagami distribution has gained widespread application in the modeling of wireless fading channels. The primary justification for the use of the Nakagami distribution is its good fit to measured fading data. This distribution can model signal fading conditions that range from severe to moderate, to light or no fading. Despite the fact that Nakagami fading is widely used in theoretical anal...
This article presents an ultra-compact and highthroughput reconfigurable architecture for implementing an efficient fading channel simulator that supports a relatively large number of propagation paths. To closely reflect actual radio signal propagation conditions, we used a recently improved Rayleigh and Ricean fading channel model based on the sumof-sinusoids technique. The improved model is ...
This paper presents a geometric analysis of the convergence condition for the Foschini-Miljanic power control algorithm with and without fading. In the fading case, a condition on the Lyapunov exponent is provided as the convergence condition. The Möbius transform is exploited for the first time to analyze the convergence conditions for both non-fading and fading cases. For the two-transmitter ...
In this paper we examine the robustness of two element transmit beamforming in the presence of feedback delay and quantization error. Specifically, we examine the robustness of two-element beamforming techniques in the presence of Ricean fading. We show that when the fading is Ricean, feedback methods are significantly more robust than when the fading is Rayleigh. This is significant since many...
ETRI Journal, Volume 26, Number 6, December 2004 In this paper, we discuss the design problem and the robustness of space-frequency trellis codes (SFTCs) for multiple input multiple output, orthogonal frequency division multiplexing (MIMO-OFDM) systems. We find that the channel constructed by the consecutive subcarriers of an OFDM block is a correlated fading channel with the regular correlatio...
Recently, a Bayesian receiver for blind detection in fading channels has been proposed by Chen, Wang and Liu (2000, IEEE Trans. Inform. Theory , 46, 2079–2094), based on the sequential Monte Carlo methodology. That work is built on a parametric modelling of the fading process in the form of a state-space model, and assumes the knowledge of the second-order statistics of the fading channel. In t...
We investigate the ergodic capacity of amplify-andforward (AF) dual-hop relaying systems in composite Nakagamim/Inverse-Gaussian fading channels. This type of fading, which is known in the literature as G fading, has recently attracted increasing research interest thanks to its ability to better approximate the Nakagami-m/lognormal model compared to the Nakagami-m/gamma model. We study both fix...
Golden space-time trellis coded modulation (GSTTCM) scheme was proposed in [1] for a high rate 2×2 multipleinput multiple-output (MIMO) system over slow fading channels. In this paper, we present the design criteria of GST-TCM over general block fading channels, where the channel matrix is constant over a fraction of the codeword length and varies from one fraction to another independently. How...
Multipath fading is a major problem of the wireless communication channel. To eliminate this fading problem and to have reliable communications in wireless channel, channel coding techniques are used. In this paper BER (bit error rate) performance is shown, by the means of Rayleigh and Rician multipath fading channels. Here the convolution encoding is used. The performance of convolution encode...
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