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Mmse performance analysis of generalized multibeam satellite channels
 IEEE Commun. Lett
, 2013
"... Abstract—Aggressive frequency reuse in the return link (RL) of multibeam satellite communications (SatComs) is crucial towards the implementation of next generation, interactive satellite services. In this direction, multiuser detection has shown great potential in mitigating the increased intrasys ..."
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Abstract—Aggressive frequency reuse in the return link (RL) of multibeam satellite communications (SatComs) is crucial towards the implementation of next generation, interactive satellite services. In this direction, multiuser detection has shown great potential in mitigating the increased intrasystem interferences, induced by a tight spectrum reuse. Herein we present an analytic framework to describe the linear Minimum Mean Square Error (MMSE) performance of multiuser channels that exhibit full receive correlation: an inherent attribute of the RL of multibeam SatComs. Analytic, tight approximations on the MMSE performance are proposed for cases where closed form solutions are not available in the existing literature. The proposed framework is generic, thus providing a generalized solution straightforwardly extendable to various fading models over channels that exhibit full receive correlation. Simulation results are provided to show
ZF Detectors over Correlated
"... Abstract—This paper provides a systematic characterization of ZeroForcing (ZF) detectors over multipleinput multipleoutput (MIMO) channels that experience both small and largescale fading. In particular, we consider the generic ..."
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Abstract—This paper provides a systematic characterization of ZeroForcing (ZF) detectors over multipleinput multipleoutput (MIMO) channels that experience both small and largescale fading. In particular, we consider the generic
ON THE SUM RATE OF ZF DETECTORS OVER CORRELATED K FADING MIMO CHANNELS
"... This paper presents a detailed sum rate investigation of ZeroForcing (ZF) detectors over composite multipleinput multipleoutput (MIMO) channels. To this end, we consider the generic K distribution (Rayleigh/gamma distribution) to model the composite fading fluctuations and also assume the general ..."
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This paper presents a detailed sum rate investigation of ZeroForcing (ZF) detectors over composite multipleinput multipleoutput (MIMO) channels. To this end, we consider the generic K distribution (Rayleigh/gamma distribution) to model the composite fading fluctuations and also assume the general case of semicorrelated smallscale fading. Novel exact analytical expressions are derived for the achievable sum rate followed by asymptotic expressions in the low SignaltoNoise ratio (SNR) regime. In parallel, new, closedform upper and lower bounds on the sum rate are derived that remain tight for all SNRs. The theoretical analysis is validated via a set of MonteCarlo simulations. 1.
An Information Theoretic Charachterization of Channel Shortening Receivers
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Relay inter...
"... Interference alignment is a signaling technique that provides high multiplexing gain in the interference channel. It can be extended to multihop interference channels, where relays aid transmission between sources and destinations. In addition to coverage extension and capacity enhancement, relays ..."
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Interference alignment is a signaling technique that provides high multiplexing gain in the interference channel. It can be extended to multihop interference channels, where relays aid transmission between sources and destinations. In addition to coverage extension and capacity enhancement, relays increase the multiplexing gain in the interference channel. In this paper, three cooperative algorithms are proposed for a multipleantenna amplifyandforward (AF) relay interference channel. The algorithms design the transmitters and relays so that interference at the receivers can be aligned and canceled. The first algorithm minimizes the sum power of enhanced noise from the relays and interference at the receivers. The second and third algorithms rely on a connection between mean square error and mutual information to solve the endtoend sumrate maximization problem with either equality or inequality power constraints via matrixweighted sum mean square error minimization. Since we can find a globally optimal solution in each iteration, the resulting iterative algorithms are convergent. Simulations show that the proposed algorithms achieve higher endtoend sumrates and multiplexing gains that existing strategies for AF relays, decodeandforward relays, and direct transmission. The first algorithm outperforms the other algorithms at high signaltonoise ratio (SNR) but performs worse than them at low SNR. Thanks to power control, the third algorithm outperforms the second algorithm at the cost of additional overhead. Index Terms Interference alignment, relayaided interference alignment, twohop interference channel, relay interference channel, relay beamforming, joint sourcerelay design.
Diversity and Multiplexing Tradeoff in the Uplink of Cellular Systems with Linear MMSE Receiver
"... Abstract—In this paper, we extend the diversity and multiplexing tradeoff (DMT) analysis from pointtopoint channels to cellular systems to evaluate the impact of intercell interference on the system reliability and efficiency. Fundamental tradeoff among diversity order, multiplexing gain and int ..."
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Abstract—In this paper, we extend the diversity and multiplexing tradeoff (DMT) analysis from pointtopoint channels to cellular systems to evaluate the impact of intercell interference on the system reliability and efficiency. Fundamental tradeoff among diversity order, multiplexing gain and intercell interference intensity is characterized to reveal the capability of multiple antennas in cellular systems. And the detrimental effects of the intercell interference on the system performance of diversity and multiplexing is presented and analyzed.
Statistical Analysis of MIMO Scheme under Nakagami Fading Channels
"... Abstract — Node isolation is one of the fundamental metrics in the design consideration and evaluation of wireless ad hoc network. This paper is aimed to introduce a statistical framework for the computing of the isolation probability of a randomly chosen node in a wireless network. The statistical ..."
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Abstract — Node isolation is one of the fundamental metrics in the design consideration and evaluation of wireless ad hoc network. This paper is aimed to introduce a statistical framework for the computing of the isolation probability of a randomly chosen node in a wireless network. The statistical framework is proposed in the context of lognormal shadowing on Nakagami fading for multiple inputs multiple output schemes. In this work, the focus is on path loss component, network topology, node density and performance of a node. The performance of connectivity between nodes in a dense network are analysed by deriving analytical models. Analysis of experimental results indicate that they are useful in estimating connectivity issues and implementing more secure wireless ad hoc networks.