Performance of Analog Network Coding Based Two-Way EH Relay With Beamforming

In this paper, we investigate the performance of an analog network coding based two-way relay system with multiple-antenna source terminals and single-antenna energy harvesting (EH) relay. We consider time-switching relaying protocol to perform EH and information processing at the amplify and forwar...

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Veröffentlicht in:IEEE transactions on communications Jg. 65; H. 4; S. 1518 - 1535
Hauptverfasser: Modem, Sudhakar, Prakriya, Shankar
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York IEEE 01.04.2017
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:
Antennas
Array signal processing
Beamforming
Coding
Data processing
Energy harvesting
energy harvesting (EH)
Ergodic processes
ergodic sum-rate
Error analysis
Error detection
Exact solutions
Mathematical analysis
Optimization
outage probability
Parameters
Protocols
Relay systems
Relaying
Relays
Sensitivity analysis
sum symbol error rate
Throughput
throughput optimization
time-switching relaying (TSR)
Two-way relay (TWR)
ISSN:0090-6778, 1558-0857
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Zusammenfassung:In this paper, we investigate the performance of an analog network coding based two-way relay system with multiple-antenna source terminals and single-antenna energy harvesting (EH) relay. We consider time-switching relaying protocol to perform EH and information processing at the amplify and forward EH relay. Assuming that the multiple-antenna source with a better link beamforms energy to the relay, we derive expressions for the system outage, ergodic sum-rate, and sum symbol error rate. In the analysis, we take into account the sensitivity of the energy harvesting circuit. We investigate the problem of throughput maximization by optimizing the fraction α of time spent on EH, and derive closed-form expressions for optimum α in important special cases. We analyze the problem of relay location for fixed α, and show that the optimum location varies with source terminal antennas. We further show that joint optimization of relay location and α yields best throughput performance. We show through simulations that unlike throughput, the optimum α that maximizes the ergodic sum-rate does not show much variation with system parameters. Simulation results with practical parameter values demonstrate the accuracy of the derived analytical expressions.
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content type line 14
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2017.2657630