Cooperative communications with relay-selection: when to cooperate and whom to cooperate with?

Ibrahim, Ahmed S.; Sadek, Ahmed K.; Su, Weifeng; Liu, K.J.R.

doi:10.1109/twc.2008.070176

Cited by 488 publications

(302 citation statements)

References 17 publications

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“…Qiang and Zarakovitis [7] proposed a joint channel and power allocation algorithm for spectrum sharing in an orthogonal frequency division multiple access (OFDMA) system. Ibrahim et al [8] investigated the relay selection problem focusing on when to cooperate and which relay to cooperate with, but the channel state information (CSI) was needed. However, these works implement resource allocation in a centralized fashion.…”

Section: Introductionmentioning

confidence: 99%

A Stackelberg Game for Spectrum Leasing in Cooperative Cognitive Radio Networks

Wang

Guan

Han

et al. 2013

Int. J. Autom. Comput.

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According to the property-rights model of cognitive radio, primary users (PUs) who own the spectrum resource have the right to lease part of spectrum to secondary users (SUs) in exchange for appropriate profit. In this paper, we propose a pricing-based spectrum leasing framework between one PU and multiple SUs. In this scenario, the PU attempts to maximize its utility by setting the price of spectrum. Then, the selected SUs have the right to decide their power levels to help PU s transmission, aiming to obtain corresponding access time. The spectrum leasing problem can be cast into a stackelberg game, where the PU plays the seller-level game and the selected SUs play the buyer-level game. Through analysis based on the backward induction, we prove that there exists a unique equilibrium in the stackelberg game with certain constraints. Numerical results show that the proposed pricing-based spectrum leasing framework is effective, and the performance of both PU and SUs is improved, compared to the traditional mechanism without cooperation.

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Section: Introductionmentioning

confidence: 99%

A Stackelberg Game for Spectrum Leasing in Cooperative Cognitive Radio Networks

Wang

Guan

Han

et al. 2013

Int. J. Autom. Comput.

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“…This is because both of the AF and DF relays use two time phases to deliver only one information unit, which introduces a pre-log factor 1 2 on the spectral efficiency [4]. The traditional selective relaying protocol [2] [5] can partially recover such rate loss, as the relay nodes are active only when necessary and thus save the redundant channel use. More recently, Two-Way Relaying (TWR), where the two source nodes exchange their information at the same time with the help of the relay nodes, has drawn lots of attention due to its potential to fully recover the rate loss resulted from half-duplexing.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Two-Way Relaying with Non-Coherent Differential Modulation

Guan

Liu

2011

IEEE Trans. Wireless Commun.

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Abstract-This work focuses on a two-way denoise-andforward relaying system using non-coherent Differential Binary Phase-Shift Keying (DBPSK) modulation, which has the welldefined relay denoising function when channel state information is unknown. We first design the relay denoising function and source decoders using Maximum Likelihood (ML) principles for the general case with parallel relays. As the ML denoising function is hard to manipulate, we approximate it as a multi-user detector followed by a physical layer network coding encoder and obtain the closed-form relay decoding error. For the singlerelay case, we show that the ML source decoder is actually equivalent to the typical DBPSK decoder for the relay-source channel and thus derive the exact end-to-end Bit Error Rate (BER). To minimize the average BER, we also investigate the power allocation problem by use of asymptotic analysis at high Signal-to-Noise Ratio (SNR). We show that the optimal source power is inversely proportional to the square root of the channel gain of the source-relay channel, and the optimal relay power decreases with SNR. For the multi-relay case, though the exact analysis is intractable, we develop upper bound and lower bound on BER and show that the diversity order is exactly ⌈ 2 ⌉ .Index Terms-Two-way relaying, differential modulation, BER, diversity order, power allocation.

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“…For instance, users experience severe channel fading can have other users/partners helping them to deliver packets to the destination with satisfied QoS requirements. Cooperative mechanism is the key to the performance of cooperative communication systems, however it is challenging to find the optimal cooperative policies, e.g., when to cooperate, how to cooperate and whom to coopeate with, in dynamic wireless networks (Ibrahim et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

MRL-CC: a novel cooperative communication protocol for QoS provisioning in wireless sensor networks

Liang

Chen

Xiao

et al. 2010

IJSNET

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Abstract:Cooperative communications have been demonstrated to be effective in combating the multiple fading effects in wireless networks, and improving the network performance in terms of adaptivity, reliability, data throughput and network lifetime. In this paper, we investigate the use of cooperative communications for quality of service (QoS) provisioning in resource-constrained wireless sensor networks, and propose MRL-CC, a Multi-agent Reinforcement Learning based multi-hop mesh Cooperative Communication mechanism. In MRL-CC, a multi-hop mesh cooperative structure is constructed for reliable data disseminations. The cooperative mechanism that defines cooperative partner assignments, and coding and transmission schemes is implemented using a multi-agent reinforcement learning algorithm. We compare the network performance of MRL-CC with MMCC (Chen et al., 2009), a Multi-hop Mesh structure based Cooperative Communication scheme, and investigate the impacts of network traffic load, interference and sensor node's mobility on the network performance. Simulation results show that MRL-CC performs well in terms of a number of QoS metrics, and fits well in large-scale networks and highly dynamic environments.

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Cooperative communications with relay-selection: when to cooperate and whom to cooperate with?

Cited by 488 publications

References 17 publications

A Stackelberg Game for Spectrum Leasing in Cooperative Cognitive Radio Networks

A Stackelberg Game for Spectrum Leasing in Cooperative Cognitive Radio Networks

Performance Analysis of Two-Way Relaying with Non-Coherent Differential Modulation

MRL-CC: a novel cooperative communication protocol for QoS provisioning in wireless sensor networks

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