Journal ArticleDOI
Multiuser Diversity in Multiuser Two-Hop Cooperative Relay Wireless Networks: System Model and Performance Analysis
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TLDR
A framework to analyze the performance of MUD in the multiuser two-hop cooperative relay networks (TCRNs) is presented and tight closed-form expressions of outage probability and symbol error probability (SEP) for the amplify-and-forward (AF), fixed decode- and- forward (DF), and selective DF protocols with MUD are derived.Abstract:
Cooperative communications significantly improve the performance of wireless networks with the help of relay nodes, whereas multiuser diversity (MUD) is a kind of diversity inherent in multiuser systems. In this paper, we present a framework to analyze the performance of MUD in the multiuser two-hop cooperative relay networks (TCRNs). Based on this framework, we derive tight closed-form expressions of outage probability and symbol error probability (SEP) for the amplify-and-forward (AF), fixed decode-and-forward (DF), and selective DF protocols with MUD. Both the theoretical analysis and simulations show that in multiuser TCRNs, MUD orders of 2K, K, and 2K can be achieved for AF, fixed DF, and selective DF, respectively (where K is the number of users).read more
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Journal ArticleDOI
Secure Multiuser Communications in Multiple Amplify-and-Forward Relay Networks
TL;DR: This paper proposes relay selection to increase the physical layer security in multiuser cooperative relay networks with multiple amplify-and-forward relays, in the presence of multiple eavesdroppers, with three criteria to select the best relay and user pair to strengthen the network security against eavesdropping attack.
Journal ArticleDOI
Joint Optimal Cooperative Sensing and Resource Allocation in Multichannel Cognitive Radio Networks
TL;DR: It is shown that the problem of joint multichannel cooperative sensing and resource allocation in a cognitive radio network with multiple potential channels and multiple secondary users can be solved by bilevel optimization and monotonic programming.
Journal ArticleDOI
Performance Analysis of OSTBC Transmission in Amplify-and-Forward Cooperative Relay Networks
TL;DR: A performance analysis is presented for amplify-and-forward (AF) cooperative relay networks employing transmit antenna diversity with orthogonal space-time block codes (OSTBCs), where multiple antennas are equipped at the transmitter.
Journal ArticleDOI
Performance analysis of multiuser diversity in cooperative multi-relay networks under rayleigh-fading channels
TL;DR: The performance analysis of multiuser diversity in cooperative multirelay networks is presented and simulations demonstrate that the multiusr diversity can be readily combined with the cooperative diversity inMultiuser cooperative relay networks.
Journal ArticleDOI
Performance Analysis of Multiuser Multiple Antenna Relaying Networks with Co-Channel Interference and Feedback Delay
TL;DR: A comprehensive performance analysis of multiuser multiple antenna amplify-and-forward relaying networks employing opportunistic scheduling with feedback delay and co-channel interference over Rayleigh fading channels suggests that the full diversity order can only be achieved when there is ideal feedback, i.e., no feedback delay.
References
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Journal ArticleDOI
Cooperative diversity in wireless networks: Efficient protocols and outage behavior
TL;DR: Using distributed antennas, this work develops and analyzes low-complexity cooperative diversity protocols that combat fading induced by multipath propagation in wireless networks and develops performance characterizations in terms of outage events and associated outage probabilities, which measure robustness of the transmissions to fading.
A table of integrals
TL;DR: Basic Forms x n dx = 1 n + 1 x n+1 (1) 1 x dx = ln |x| (2) udv = uv − vdu (3) 1 ax + bdx = 1 a ln|ax + b| (4) Integrals of Rational Functions
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User cooperation diversity. Part I. System description
TL;DR: Results show that, even though the interuser channel is noisy, cooperation leads not only to an increase in capacity for both users but also to a more robust system, where users' achievable rates are less susceptible to channel variations.
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User cooperation diversity. Part II. Implementation aspects and performance analysis
TL;DR: It is illustrated that, under all scenarios studied, cooperation is beneficial in terms of increasing system throughput and cell coverage, as well as decreasing sensitivity to channel variations.