Results 1 - 10 of 1,186

Capacity Limits of MIMO Channels

by Andrea Goldsmith, Sriram Vishwanath, et al. - IEEE J. SELECT. AREAS COMMUN , 2003
"... We provide an overview of the extensive recent results on the Shannon capacity of single-user and multiuser multiple-input multiple-output (MIMO) channels. Although enormous capacity gains have been predicted for such channels, these predictions are based on somewhat unrealistic assumptions about t ..."
Abstract - Cited by 419 (17 self) - Add to MetaCart
, for each definition, different correlation models and channel information assumptions that we consider. We first provide a comprehensive summary of ergodic and capacity versus outage results for single-user MIMO channels. These results indicate that the capacity gain obtained from multiple antennas heavily

Space-time codes for high data rate wireless communication: Performance criterion and code construction

by Vahid Tarokh, Nambi Seshadri, A. R. Calderbank - IEEE TRANS. INFORM. THEORY , 1998
"... We consider the design of channel codes for improving the data rate and/or the reliability of communications over fading channels using multiple transmit antennas. Data is encoded by a channel code and the encoded data is split into n streams that are simultaneously transmitted using n transmit ant ..."
Abstract - Cited by 1782 (28 self) - Add to MetaCart
are provided for 4 and 8 PSK signal sets with data rates of 2 and 3 bits/symbol, demonstrating excellent performance that is within 2–3 dB of the outage capacity for these channels using only 64 state encoders.

Fading relay channels: Performance limits and space-time signal design

by Rohit U. Nabar, Helmut Bölcskei, Felix W. Kneubühler - IEEE J. SELECT. AREAS COMMUN , 2004
"... Cooperative diversity is a transmission technique where multiple terminals pool their resources to form a virtual antenna array that realizes spatial diversity gain in a distributed fashion. In this paper, we examine the basic building block of cooperative diversity systems, a simple fading relay ch ..."
Abstract - Cited by 445 (4 self) - Add to MetaCart
) or decode-and-forward (DF) modes. For each protocol, we study the ergodic and outage capacity behavior (assuming Gaussian code books) under the AF and DF modes of relaying. We analyze the spatial diversity performance of the various protocols and find that full spatial diversity (second-order in this case

Capacity bounds and power allocation for wireless relay channels

by Anders Høst-madsen, Junshan Zhang - IEEE TRANS. INF. THEORY , 2005
"... We consider three-node wireless relay channels in a Rayleigh-fading environment. Assuming transmitter channel state information (CSI), we study upper bounds and lower bounds on the outage capacity and the ergodic capacity. Our studies take into account practical constraints on the transmission/rece ..."
Abstract - Cited by 324 (6 self) - Add to MetaCart
We consider three-node wireless relay channels in a Rayleigh-fading environment. Assuming transmitter channel state information (CSI), we study upper bounds and lower bounds on the outage capacity and the ergodic capacity. Our studies take into account practical constraints on the transmission

Clock Rate versus IPC: The End of the Road for Conventional Microarchitectures

by Vikas Agarwal, M.S. Hrishikesh, Stephen W. Keckler, Doug Burger , 2000
"... The doubling of microprocessor performance every three years has been the result of two factors: more transistors per chip and superlinear scaling of the processor clock with technology generation. Our results show that, due to both diminishing improvements in clock rates and poor wire scaling as se ..."
Abstract - Cited by 324 (23 self) - Add to MetaCart
The doubling of microprocessor performance every three years has been the result of two factors: more transistors per chip and superlinear scaling of the processor clock with technology generation. Our results show that, due to both diminishing improvements in clock rates and poor wire scaling

Capacity Limits of MIMO Channels

by Sriram Vishwanath, Student Member - IEEE J. Select. Areas Commun , 2003
"... Abstract—We provide an overview of the extensive recent results on the Shannon capacity of single-user and multiuser multiple-input multiple-output (MIMO) channels. Although enormous capacity gains have been predicted for such channels, these predictions are based on somewhat unrealistic assumptions ..."
Abstract - Cited by 3 (0 self) - Add to MetaCart
capacity definitions and, for each definition, different correlation models and channel information assumptions that we consider. We first provide a comprehensive summary of ergodic and capacity versus outage results for single-user MIMO channels. These results indicate that the capacity gain obtained from

Stochastic Geometry and Random Graphs for the Analysis and Design of Wireless Networks

by Martin Haenggi, Jeffrey G. Andrews, François Baccelli, Olivier Dousse, Massimo Franceschetti
"... Wireless networks are fundamentally limited by the intensity of the received signals and by their interference. Since both of these quantities depend on the spatial location of the nodes, mathematical techniques have been developed in the last decade to provide communication-theoretic results accoun ..."
Abstract - Cited by 240 (42 self) - Add to MetaCart
theory, percolation theory, and probabilistic combinatorics – have led to results on the connectivity, the capacity, the outage probability, and other fundamental limits of wireless networks. This tutorial article surveys some of these techniques, discusses their application to model wireless networks

Transmission capacity of wireless ad hoc networks with successive . . .

by Steven Weber, Jeffrey G. Andrews, Xiangying Yang, Gustavo de Veciana - IEEE TRANS. ON INFO. THEORY , 2005
"... The transmission capacity of a wireless ad hoc network can be defined as the maximum allowable area spectral efficiency such that the outage probability does not exceed some specified threshold. This work studies the improvement in transmission capacity obtainable with successive interference cance ..."
Abstract - Cited by 190 (42 self) - Add to MetaCart
The transmission capacity of a wireless ad hoc network can be defined as the maximum allowable area spectral efficiency such that the outage probability does not exceed some specified threshold. This work studies the improvement in transmission capacity obtainable with successive interference

Service outage based power and rate allocation

by Jianghong Luo, Lang Lin, Roy Yates, Predrag Spasojević , 2001
"... This paper explores a spectrally efficient, variable rate transmission scheme under a service outage constraint for a block fading channel model. The service outage constraint is motivated by real time variable rate applications. In a service outage, the transmission code rate is below a given bas ..."
Abstract - Cited by 21 (2 self) - Add to MetaCart
basic rate and may in fact be zero. Unlike an information outage in the capacity versus outage problem, asymptotically error free communication is maintained during a service outage. We solve the problem of maximizing the time average transmission code rate subject to the probability of service outage

Secrecy Outage Capacity of Fading Channels

by Onur Gungor, Jian Tan, Can Emre Koksal, Hesham El-gamal, Ness B. Shroff
"... Abstract—This paper considers point to point secure communi-cation over flat fading channels under an outage constraint. More specifically, we extend the definition of outage capacity to account for the secrecy constraint and obtain sharp characterizations of the corresponding fundamental limits und ..."
Abstract - Cited by 7 (2 self) - Add to MetaCart
Abstract—This paper considers point to point secure communi-cation over flat fading channels under an outage constraint. More specifically, we extend the definition of outage capacity to account for the secrecy constraint and obtain sharp characterizations of the corresponding fundamental limits
Results 1 - 10 of 1,186