TITLE:
Modified Cooperative Subchannel Allocation Algorithms and PSO Based Power Allocation for an Alamouti Decode and Forward Relaying Protocol in Multiuser OFDMA Systems
AUTHORS:
K. Shoukath Ali, P. Sampath
KEYWORDS:
Amplify-and-Forward, Decode-and-Forward, Cooperative Relay, Maximal Ratio Combining, Symbol Error Rate
JOURNAL NAME:
Circuits and Systems,
Vol.7 No.8,
June
20,
2016
ABSTRACT: The present work is a
discussion on the performance analysis of Modified Cooperative Subchannel
Allocation (CSA) Algorithms which is used in Alamouti Decoded and Forward
(Alamouti DF) Relaying Protocol for wireless multi-user Orthogonal Frequency
Division Multiplexing Access (OFDMA) systems. In addition, the performance of
approximate Symbol Error Rate (SER) for the Alamouti DF Relaying Protocol with
the Cooperative Maximum Ratio Combining Technique (C-MRC)is analyzed and compared with SER
upper bound. The approximate SER is asymptotically tight bound at higher
Signal-to-Noise Ratio (SNR). From the asymptotic tight bound approximate SER,
Particle Swarm Optimization (PSO) based Power Allocation (PA) is determined for
the Alamouti DF Relaying Protocol. The simulation results suggested that the
Modified Throughput based Subchannel Allocation Algorithm achieved an improved
throughput of 6% to 33% compared to that of existing cooperative diversity
protocol. Further, the Modified Fairness based Subchannel Allocation Algorithm
rendered fairness of 7.2% to 17% among the multiuser against the existing
cooperative diversity protocol.