Decode-and-Forward Cooperative Diversity with Power Allocation in Wireless Networks

Luo, J.; Blum, Rick S.; Cimini, Leonard J.; Greenstein, L.J.; Haimovich, Alexander M.

doi:10.1109/twc.2007.05272

Cited by 204 publications

(84 citation statements)

References 10 publications

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“…This is not the situation in other regenerate and forward CD schemes reported in the literature, e.g., [3], [7], [9], and [11].…”

Section: B Regenerate and Forward CD Schemementioning

confidence: 71%

“…For the regenerate and forward CD schemes, if the user can have different power levels for transmitting and relaying [3], [7], [9], [11], the optimization problem can be solved using the same approach as in the previous section. In a practical situation, when a user must have the same power level for transmitting and relaying due to implementation concern [2], the power allocation problem can be formulated as the following convex optimization problem: where e 1 and e 2 are the maximum tolerable BEPs for users 1 and 2, respectively, E…”

Section: B Power Allocation For Regenerate and Forward CD Scheme 1) mentioning

confidence: 99%

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Partner Selection Based on Optimal Power Allocation in Cooperative-Diversity Systems

Mahinthan

Cai

Mark

et al. 2008

IEEE Trans. Veh. Technol.

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Abstract-We study how to appropriately match users for two-user cooperative-diversity (CD) systems deploying an optimal-power-allocation (OPA) strategy, considering both the amplify and forward and the regenerate and forward CD schemes. The OPA strategies, which can minimize the total energy consumption for the cooperating pair, are derived for both CD schemes. Then, we study the location of the optimal partner for a user and develop a novel nonbipartite stable matching algorithm with a performance that is very close to the optimal maximum weighted (MW) matching algorithm. The proposed matching algorithm is simple to implement, and its computational complexity is one order lower than that of the optimal MW matching algorithm. Numerical results show that with the OPA and the proposed matching algorithm, a 9∼10 dB CD gain can be achieved, which is equivalent to prolonging the cell-phone-battery recharge time by about ten times.Index Terms-Cooperative diversity (CD), matching algorithm, partner selection, power allocation, wireless networks.

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“…This is not the situation in other regenerate and forward CD schemes reported in the literature, e.g., [3], [7], [9], and [11].…”

Section: B Regenerate and Forward CD Schemementioning

confidence: 71%

Section: B Power Allocation For Regenerate and Forward CD Scheme 1) mentioning

confidence: 99%

Partner Selection Based on Optimal Power Allocation in Cooperative-Diversity Systems

Mahinthan

Cai

Mark

et al. 2008

IEEE Trans. Veh. Technol.

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“…In [11], for centralized Dis-STBC, a near-optimal power allocation was proposed. In this strategy, by assuming each potential relay knows its local mean channel gain to the destination, some decoded nodes which have good mean channel gains are selected as the relays.…”

Section: Related Workmentioning

confidence: 99%

System With Excitation Control

Pravin¹,

Dani²

2011

IJMSR

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-Two ad-hoc, power allocation strategies for a decentralized distributed Space Time Block Coding (Dis-STBC) system is proposed in this paper where knowledge about the Channel State Information (CSI) is not available at the transmitter. The first is an open-loop strategy which requires no control signaling; the second is a feedback-assisted strategy which requires some control signaling, but which can achieve better power-efficiency. Focusing on a particular decentralized Dis-STBC scheme, the asymptotic outage probability is derived and the power-efficiency advantages of the proposed strategies over a uniform-power strategy are illustrated by evaluating the outage and link failure probabilities.Keywords: Channel State Information, decentralized distributed Space Time Block Coding, power allocation, outage and link failure probabilities. 1.INTRODUCTIONCooperative diversity is a diversity technique which is obtained when relay nodes are used for transmitting the signals. The source node transmits two independent signals to the relay node and the destination node, and the destination node receives signal from the source and the retransmitted signal from the relay node. With the help of relaying node the quality of the signal received at the destination can be improved. For notational simplification, system with three nodes namely source, relay and destination is considered.The history of the cooperative communication can find its deep roots to the groundbreaking work of [1], when the concept of relay channel model was introduced. The channel model consists of a source, destination and relay; and who's major purpose was to facilitate the information transfer from source to destination. Later, [2] deeply investigated the relay channel model, which provided a number of fundamental relaying techniques such as Decode and Forward (DF) and Compress and Forward (CF). In conventional communication, data is transmitted between the source and destination, and no user provides assistance to one another. 2.RELATED WORKA number of anonymous routing schemes have been proposed for ad hoc networks, and they provide different level of privacy protection.In [3], a distributed space-time block code (Dis-STBC) was proposed in which each relay transmits one unique column of the underlying STBC matrix. So that each selected relay knows which column to transmit, most of the proposed Dis-STBC schemes [4][5][6][7] require a central control unit or full inter-node negotiations.

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“…For minimizing complexity of the system, AF is the best technique which forward the amplified received signal of the source to destination with the demerit of noise also being get amplified along with the signal [4] [2] [5] [6] [7,8]. For better performance DF is normally taken into account which decodes the signal at the relay and then encode it back before forwarding [2,4] [9] [10] [11]. In practical sense, more than one relays are present and use of all relays will leads to interference with the sources, high power consumption and consuming high bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Efficient Relay Selection Scheme based on Fuzzy Logic for Cooperative Communication

Waqas¹,

Touqir²,

Khan³

et al. 2016

ijacsa

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Abstract-The performance of cooperative network can be increased by using relay selection technique. Therefore, interest in relay selection is sloping upward. We proposed two new relay selection schemes based on fuzzy logic for dual hop cooperative communication. These relay selection schemes require SNR (signal to noise ratio), cooperative gain and channel gain as input fuzzy parameters for selection of best relay. The performance of first proposed relay selection scheme is evaluated in term of BER (bit error rate) in Nakagami, Rician and Rayleigh fading channels. In second proposed relay selection scheme, threshold is used with the objective to minimize the power consumption and channel estimation load. Its performance is analyzed in term of BER, number of active relays and load of number of channel estimations.

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Decode-and-Forward Cooperative Diversity with Power Allocation in Wireless Networks

Cited by 204 publications

References 10 publications

Partner Selection Based on Optimal Power Allocation in Cooperative-Diversity Systems

Partner Selection Based on Optimal Power Allocation in Cooperative-Diversity Systems

System With Excitation Control

Efficient Relay Selection Scheme based on Fuzzy Logic for Cooperative Communication

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