Power allocation over Nakagami-lognormal fading channels with outage probability specifications

2021 ◽  
Vol 8 (1) ◽  
pp. 17-25
Author(s):  
Kan-Lin Hsiung ◽  
Hsin-Yu Chen
Keyword(s):  
Outage Probability ◽  
Power Allocation ◽  
Fading Channels

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 Outage Probability and Normalized SINR-Based Power Allocation over Rician Fading Channels

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Danh H. Ho ◽  
T. Aaron Gulliver
Keyword(s):  
Energy Efficiency ◽  
Power Consumption ◽  
Outage Probability ◽  
Power Allocation ◽  
Fading Channels ◽  
Moment Generating Function ◽  
Upper And Lower Bounds ◽  
Rician Fading ◽  
The Moment ◽  
Rician Fading Channels

This paper considers power allocation in cellular networks over Rician fading channels. The goal is to improve the power consumption and energy efficiency as well as satisfy as many users as possible subject to user outage probability and normalized signal to interference plus noise ratio (SINR) constraints. The exact outage probability over Rician fading channels is determined using the moment-generating function (MGF). Further, upper and lower bounds on the outage probability are derived. These are used to characterize the relationship between outage probability and normalized SINR in Rician fading channels. Power allocation algorithms for power minimization and energy efficiency are proposed. Simulation results are presented to compare the performance of the proposed schemes with existing methods in terms of power consumption, throughput, energy efficiency, outage probability, and number of unsatisfied users.

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.

Energy-Efficient Power Allocation for HARQ Systems

2016 ◽  
pp. 179-198
Author(s):  
Tumula V. K. Chaitanya ◽  
Tho Le-Ngoc ◽  
Erik G. Larsson
Keyword(s):  
Outage Probability ◽  
Closed Form ◽  
Power Allocation ◽  
Fading Channels ◽  
Data Transmission ◽  
Optimization Problems ◽  
Average Energy ◽  
Data Packet ◽  
Average Energy Consumption ◽  
Arq Schemes

Reliability of data transmission is a fundamental problem in wireless communications. Fading in wireless channels causes the signal strength to vary at the receiver and this results in loss of data packets. To improve the reliability, automatic repeat request (ARQ) schemes were introduced. However these ARQ schemes suffer from a reduction in the throughput. To address the throughput reduction, conventional ARQ schemes were combined with forward error correction (FEC) schemes to develop hybrid-ARQ (HARQ) schemes. For improving the reliability of data transmission, HARQ schemes are included in the wireless standards like LTE, LTE-Advanced and WiMAX. Conventional HARQ systems use the same transmission power in different ARQ rounds. However this is not optimal in terms of minimizing the average energy spent for successful transmission of a data packet. In this book chapter, the recent research results related to HARQ systems are reviewed first. Next, optimal resource allocation in HARQ systems with a limit on the maximum number of allowed transmissions for a data packet is considered in the next part. Specifically, the problem of minimizing the rate-outage probability under a constraint on average energy consumption per data packet for both incremental redundancy (IR)-based and Chase combining (CC)-based HARQ systems is considered. Towards solving the optimization problems, the expressions for rate-outage probability of both IR-HARQ and CC-HARQ systems in i.i.d. Rayleigh fading channels is provided. Methods to solve the optimization problems using nonlinear optimization techniques are discussed. To reduce the complexity of finding a solution, the rate-outage probability expressions are approximated, using which, the non-convex optimization problems are converted into geometric programming problems (GPPs), for which the closed-form solutions are derived. Illustrative and analytical results show that the proposed power allocation provides significant gains in energy savings over the traditional equal power allocation transmission, and the closed-form GPP solution can provide a performance close to that of the exact method for smaller values of rate-outage probability.

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