Joint Optimal Subcarrier and Power Allocation for Wireless Cooperative Networks Over OFDM Fading Channels

2012 ◽  
Vol 61 (1) ◽  
pp. 249-257 ◽  
Author(s):  
Di Wang ◽  
Zhaoquan Li ◽  
Xin Wang
Keyword(s):  
Power Allocation ◽  
Fading Channels ◽  
Cooperative Networks

scholarly journals Performance Analysis of SNR-Based HDAF M2M Cooperative Networks

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Lingwei Xu ◽  
Hao Zhang ◽  
T. Aaron Gulliver
Keyword(s):  
Numerical Simulation ◽  
Performance Analysis ◽  
Lower Bound ◽  
Outage Probability ◽  
Power Allocation ◽  
Fading Channels ◽  
Cooperative Networks ◽  
Nakagami Fading ◽  
Nakagami Fading Channels

The lower bound on outage probability (OP) of mobile-to-mobile (M2M) cooperative networks overN-Nakagami fading channels is derived for SNR-based hybrid decode-amplify-forward (HDAF) relaying. The OP performance under different conditions is evaluated through numerical simulation to verify the accuracy of the analysis. These results show that the fading coefficient, number of cascaded components, relative geometric gain, and power-allocation are important parameters that influence this performance.

scholarly journals Joint TAS and Power Allocation for SDF Relaying M2M Cooperative Networks

2016 ◽  
Vol 2016 ◽  
pp. 1-6
Author(s):  
Lingwei Xu ◽  
Hao Zhang ◽  
Jingjing Wang
Keyword(s):  
Power Allocation ◽  
Fading Channels ◽  
Performance Optimization ◽  
Antenna Selection ◽  
Cooperative Networks ◽  
Transmit Antenna Selection ◽  
Decode And Forward ◽  
Simulation Results ◽  
Nakagami Fading Channels ◽  
Multiple Relay

The outage probability (OP) performance of multiple-relay-based selective decode-and-forward (SDF) relaying mobile-to-mobile (M2M) networks with transmit antenna selection (TAS) overN-Nakagami fading channels is investigated. The exact closed-form expressions for OP of the optimal and suboptimal TAS schemes are derived. The power allocation problem is formulated for performance optimization. Then, the OP performance under different conditions is evaluated through numerical simulations to verify the analysis. The simulation results showed that optimal TAS scheme has a better OP performance than suboptimal TAS scheme. Further, the power allocation parameter has an important influence on the OP performance.

Relay Selection Based Double-Differential Transmission for Cooperative Networks with Multiple Carrier Frequency Offsets: Model, Analysis, and Optimization

Frequenz ◽  
2014 ◽  
Vol 0 (0) ◽  
Author(s):  
Kun Zhao ◽  
Bangning Zhang ◽  
Kegang Pan ◽  
Aijun Liu ◽  
Daoxing Guo
Keyword(s):  
Outage Probability ◽  
Power Allocation ◽  
Fading Channels ◽  
Carrier Frequency ◽  
Relay Selection ◽  
Cooperative Networks ◽  
Allocation Strategy ◽  
Carrier Frequency Offsets ◽  
Frequency Offsets ◽  
Ber Performance

AbstractDue to the distributed nature, cooperative networks are generally subject to multiple carrier frequency offsets (MCFOs), which make the channels time-varying and drastically degrade the system performance. In this paper, to address the MCFOs problem in detect-andforward (DetF) multi-relay cooperative networks, a robust relay selection (RS) based double-differential (DD) transmission scheme, termed RSDDT, is proposed, where the best relay is selected to forward the source's double-differentially modulated signals to the destination with the DetF protocol. The proposed RSDDT scheme can achieve excellent performance over fading channels in the presence of unknown MCFOs. Considering double-differential multiple phase-shift keying (DDMPSK) is applied, we first derive exact expressions for the outage probability and average bit error rate (BER) of the RSDDT scheme. Then, we look into the high signal-to-noise ratio (SNR) regime and present simple and informative asymptotic outage probability and average BER expressions, which reveal that the proposed scheme can achieve full diversity. Moreover, to further improve the BER performance of the RSDDT scheme, we investigate the optimum power allocation strategy among the source and the relay nodes, and simple analytical solutions are obtained. Numerical results are provided to corroborate the derived analytical expressions and it is demonstrated that the proposed optimum power allocation strategy offers substantial BER performance improvement over the equal power allocation strategy.

Joint TAS and Power Allocation for Multiuser M2M Cooperative Networks

2018 ◽  
Vol 35 (6) ◽  
pp. 574-580 ◽  
Author(s):  
Lingwei Xu ◽  
Jingjing Wang ◽  
Yun Liu ◽  
Ye Li ◽  
T. Aaron Gulliver
Keyword(s):  
Power Allocation ◽  
Cooperative Networks

scholarly journals Security-Reliability Tradeoff Analysis in Multisource Multirelay Cooperative Networks with Multiple Cochannel Interferers

2018 ◽  
Vol 2018 ◽  
pp. 1-12
Author(s):  
Weilong Hu ◽  
Jiangbo Si ◽  
Hongyan Li
Keyword(s):  
Fading Channels ◽  
Physical Layer Security ◽  
Communication Technologies ◽  
Cooperative Networks ◽  
Cooperative Relaying ◽  
Green Communication ◽  
Intercept Probability ◽  
Outage Probabilities ◽  
Reliability Performance ◽  
The Impact

Cooperative relaying communication is one of the green communication technologies since it shortens the communication distance and saves the transmit power. In this paper, the physical-layer security (PLS) of a multisource multirelay cooperative relaying communication network is investigated by considering the influence of cochannel interference from a security-reliability tradeoff (SRT) perspective. First, the SRT performance is characterized by the outage probability (OP) and the intercept probability (IP). In particular, the IP encountered at the eavesdropper is used to evaluate the security performance, while the reliability performance is analyzed in terms of the OP experienced at the destination. Then, under the impact of multiple cochannel interferers, the intercept probabilities and the outage probabilities of both the conventional direct transmission (DT) strategy and relay selection (RS) strategy are derived in closed-form expressions over Rayleigh fading channels, respectively. Simulation results are provided to validate the theoretical analysis. It is shown that when the OP (reliability) requirement is relaxed, the IP (security) performance improves and vice versa. It confirms that there is an SRT existing between the OP and the IP. Meanwhile, a better SRT performance can be achieved by increasing the number of sources, relays, and cochannel interferers. In addition, it is also shown that the RS strategy generally outperforms the conventional DT strategy in terms of the product of the IP and the OP.

scholarly journals Asymptotics and Power Allocation for State Estimation Over Fading Channels

2011 ◽  
Vol 47 (1) ◽  
pp. 611-633 ◽  
Author(s):  
Alex S. Leong ◽  
Subhrakanti Dey ◽  
Jamie S. Evans
Keyword(s):  
State Estimation ◽  
Power Allocation ◽  
Fading Channels
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