Multi-user space-time coding in cooperative networks

Anghel, P.A.; Leus, Geert; Kavehl, M.

doi:10.1109/icassp.2003.1202544

Cited by 119 publications

(90 citation statements)

References 7 publications

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“…2) Coding relays: Relays can employ orthogonal coding techniques to enhance the diversity order of the system. An example is the distributed Alamouti method proposed in [11], where two relays retransmit in an amplify-andforward manner, and one of the relays additionally conjugates and negates the signal. 3) Smart amplifying relays: which performs both amplification and data recovery which means it has more complicated hardware stages w.r.t.…”

Section: Operation Of Relaysmentioning

confidence: 99%

Smart Amplify and Forward Relaying in Time and Frequency Diversity Systems

Hussein¹

2015

International Journal of Advanced Research in Computer and Comm

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Long distances transmission in mobile communication is considered serious problem especially in 3 rd and 4 th generations for mobile systems. In order to keep service efficiency in long distance similar to small distance case, two possible solutions are proposed; first is by applying efficient amplification and equalization stages at receiving end. Second solution is by applying relaying network between source and destination. In this paper two relaying techniques were introduced; amplify and forward (AF) relaying and smart AF relaying. Both mention relaying techniques have been simulated using MATLAB program in case of MIMO CDMA and OFDM systems.

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Section: Operation Of Relaysmentioning

confidence: 99%

Smart Amplify and Forward Relaying in Time and Frequency Diversity Systems

Hussein¹

2015

International Journal of Advanced Research in Computer and Comm

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“…So far, the AF amplification factors that have been proposed in literature are the fixed-gain (semi blind) relay in (Laneman et al, 2004) and variable-gain relays in (Nabar et al, 2004;Anghel and Kaveh, 2003;Liu et al, 2008). The fixed-gain applies a constant gain on the received signal from the source regardless of the amplitude on the source-relay hop (Hasna and Aloini, 2004).…”

Section: Introductionmentioning

confidence: 99%

Computing Amplify-and-Forward Relay Amplification Factor to Improve Total Capacity at Destination

Bello¹,

Zen²,

Othman³

et al. 2015

American Journal of Applied Sciences

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In this study, we propose a new Amplify-and-Forward (AF) amplification factor to improve the error performances of the current AF schemes and thus enhance the total capacity at the destination terminal. The proposed scheme has two degrees of freedom, meaning that it contains two variable parameters that can simultaneously vary the amplification factor instead of one as in traditional variable-gain or semi-blind relaying. The numerical results show that the proposed AF scheme outperforms some current ones with which it is compared in terms of average capacity and probability of outage and thus brings AF relaying performances closer to that of Decode-and Forward (DF) strategy which hitherto outperforms it. The results also show that by increasing or decreasing the power share of the relay, the optimal location of the relay is not only moved closer to or farther away from the destination, the total average capacity at that location is also correspondingly increased or decreased.

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“…The topology is symmetric with normalized link distances: . spatial diversity techniques presented in the literature [1][2][3][4][5][8][9][10][11][13][14] are noted. Simulations are presented that show the impact of the individual system resource constraints on amplified relaying, decoded relaying with error propagation, and decoded relaying without error propagation.…”

Section: Chnl Relay 2chnl Destination Full Source (2r2dfs)mentioning

confidence: 99%

“…The 1R2D model corresponds to the multi-user diversity models presented in [1,5] under an alternate channel allocation where the source transmits on channel C0 and all relays transmit on channel C1. The source and destination are connected to all relays.…”

Section: System Connectivity Model Minimum Cost Constraint Setmentioning

confidence: 99%

“…INTRODUCTION Recent findings in the literature have shown that the performance of wireless relaying networks can be increased through the application of distributed spatial diversity techniques that rely on the mesh connectivity between wireless mobile terminals [1][2][3][4][5][8][9][10][11][13][14]. Multi-user diversity [1,5] achieves spatial diversity by relaying the signal along multiple routes in parallel. Multihop diversity [2,3] achieves spatial diversity from the concurrent reception of signals that have been transmitted by multiple relays in serial along a single primary route.…”

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confidence: 99%

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On the impact of system resource constraints on wireless relaying channels

Boyer

Falconer

Yanıkömeroğlu

IEEE International Conference on Communications, 2005. ICC 2005. 2005

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-This paper considers the impact of various system resource constraints on the connectivity and performance of relaying channels. This consideration is motivated by recent findings indicating that the performance of wireless relaying networks can be increased through the application of distributed spatial diversity techniques (ex. multi-user diversity [1,5], multihop diversity [2,3], cooperative diversity [7-12]) that rely on the mesh connectivity between wireless terminals. Relevant system resource constraints are introduced, constraint combinations are analyzed, and resultant system connectivity models are derived and compared via simulation results. The constraints considered are the available number of orthogonal relaying channels, the ability of relays to diversity combine signals, the ability of the destination to diversity combine signals, the ability of receivers to diversity combine signals on multiple orthogonal channels, and the ability of transmitters to transmit signals on multiple orthogonal channels. The analysis of these system resource constraints is applicable to both amplified (non-regenerative, amplify-and-forward) relaying and decoded (regenerative, decode-and-forward) relaying.Index Terms -multihop relaying, distributed spatial diversity, multihop diversity, cooperative diversity, mesh networks

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Multi-user space-time coding in cooperative networks

Cited by 119 publications

References 7 publications

Smart Amplify and Forward Relaying in Time and Frequency Diversity Systems

Smart Amplify and Forward Relaying in Time and Frequency Diversity Systems

Computing Amplify-and-Forward Relay Amplification Factor to Improve Total Capacity at Destination

On the impact of system resource constraints on wireless relaying channels

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