Topic
Fading distribution
About: Fading distribution is a research topic. Over the lifetime, 5732 publications have been published within this topic receiving 114193 citations.
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TL;DR: Applications of the models to predict performance of a minimum shift keying (MSK) signal at 2400 bits/s show that large margins are required to compensate for the effects of fading and shadowing, and conventional coherent demodulation of a MSK signal may not be feasible due to phase variation caused by fading andshadowing.
Abstract: The fading and shadowing effects observed on land mobile satellite signals are characterized in statistical terms. Models are developed in terms of probability distribution of the signal's envelope and phase as well as its rate of change with time. The multipath fading and shadowing effects modelled are typical of those encountered in a mobile-satellite link in rural and suburban areas. A comparison of the models with experimental data at 870 MHz and 1542 MHz is given. Applications of the models to predict performance of a minimum shift keying (MSK) signal at 2400 bits/s show that large margins are required to compensate for the effects of fading and shadowing. In addition, the results show that conventional coherent demodulation of a MSK signal may not be feasible due to phase variation caused by fading and shadowing. On the other hand, the results show that random FM has negligible effect on the probability of error of the MSK signal at 2400 bits/s when frequency demodulation is used.
71 citations
TL;DR: This paper theoretically investigates the signal degradation induced by intersubcarrier interference and frequency-selective fading in orthogonal frequency-division-multiplexing radio-over-fiber systems and proposes Turbo codes and bit interleaver technologies to effectively mitigate unbalanced error distribution.
Abstract: This paper theoretically investigates the signal degradation induced by intersubcarrier interference and frequency-selective fading in orthogonal frequency-division-multiplexing radio-over-fiber systems. Turbo codes and bit interleaver technologies are proposed to effectively mitigate unbalanced error distribution because of intersubcarrier interference and frequency-selective fading. Experimental results show that the receiver sensitivities are improved as far as 5 dB after 50-km SMF-28 transmission for 6.25-Gb/s wireless signals on optical generated 60-GHz carrier.
71 citations
TL;DR: A visual integral region-based geometric analysis (GA-IR) approach is introduced, which does not depend on the specific functional forms of the channel fading distributions, and derived the expressions of both individual and system outage probabilities with adjustable accuracy.
Abstract: Amplify-and-forward-based two-way relaying (TWR-AF) promises significant benefits in wireless networks. In this paper, we aim to obtain unified expressions to determine the outage probability of TWR-AF, regardless of different channel fadings. To this end, a visual integral region-based geometric analysis (GA-IR) approach is introduced, which does not depend on the specific functional forms of the channel fading distributions. Applying this method, we have derived the expressions of both individual and system outage probabilities with adjustable accuracy. Importantly, our analysis is then extended to multiuser and multirelay TWR-AF, and a unified expression and a concise lower bound are achieved. It has been shown that all the presented expressions apply to unequal transmitted power values and conventional fading channels, providing valuable and unified insights into practical system pretest evaluation and designs. By performing simulations over several representative fading channels [e.g., Rayleigh, Nakagami- $m$ , Rice (Nakagami- $n$ ), and generalized- $K$ (KG)] , the accuracy and generality of the provided expressions are presented. Utilizing these results, the outage performance for TWR-AF can be figured out flexibly and efficiently.
71 citations
TL;DR: This letter analyzes the effect of the carrier frequency offset on orthogonal frequency division multiplexing (OFDM) systems for multipath fading channels and derives an approximate expression that is shown to be an upper bound of the average SNR for flat fade channels and an exact expression for the AWGN channel.
Abstract: This letter analyzes the effect of the carrier frequency offset on orthogonal frequency division multiplexing (OFDM) systems for multipath fading channels. A simple approximate expression for the average signal-to-noise ratio (SNR) is derived. This approximate expression is shown to be an upper bound of the average SNR for flat fading channels and an exact expression for the AWGN channel. The approximate average SNR expression is validated using Monte Carlo simulation for both flat fading channels and frequency-selective fading channels
71 citations
17 Nov 2002
TL;DR: Using results from multivariate statistics, a tight closed-form lower-bound is derived for the ergodic capacity of Gaussian multiple-input multiple-output (MIMO) fading channels at any signal-to-noise ratio (SNR) regime.
Abstract: We consider Gaussian multiple-input multiple-output (MIMO) fading channels assuming that the channel is unknown at the transmitter and perfectly known at the receiver. Using results from multivariate statistics, we derive a tight closed-form lower-bound for the ergodic capacity of such channels at any signal-to-noise ratio (SNR). Moreover, we provide an accurate closed-form analytical approximation of ergodic capacity in the high SNR regime. Our analysis incorporates the frequency-selective Rayleigh fading case and/or spatial fading correlation, and allows Important Insights Into optimal (ergodic capacity maximizing) MIMO configurations. Finally, we verify our analytical expressions through comparison with numerical results.
71 citations