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Quality of service aware antenna selection scheme for multi-hop relay networks |
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| Affiliation: | 1. School of Electronics Engineering, VIT University, Vellore, Tamil Nadu, India;2. School of Electrical Engineering, VIT University, Vellore, Tamil Nadu, India;1. Department of Electrical Engineering, University of Shahid Beheshti, G.C. 15914 Tehran, Iran;2. Department of Electrical Engineering, Amirkabir University of Technology, 15914 Tehran, Iran;1. College of Information Engineering, Xiangtan University, Xiangtan 411105, China;2. Dept. of Optoelectronic Engineering, Xiangtan University, Xiangtan, Hunan 411105, China |
| Abstract: | Multi input multi output (MIMO) based multi-hop relay (MHR) networks has become one of the promising technologies in improving the quality of wireless links. The optimal antenna selection is one of the suitable solutions to overcome the limitations of MIMO scheme. To attain the full benefits of transmitter antenna selection schemes, perfect channel quality information (CQI) is required at the transmitter. The time varying channel and the feedback delay make CQI at the transmitter outdated and also affect the antenna selection process. In this work, we have derived the symbol error probability (SEP) of M-ary quadrature amplitude modulation (QAM) for three different antenna selection schemes by considering the effect of delayed CQI. All these derived expressions are the function of correlation between CQI at the receiver and delayed CQI at the transmitter. The simulation results show that the antenna selection gain decreases with the decrease in correlation. It is also observed that scheme 1 based antenna selection is optimal for different constellations and more suited for MHR network. |
| Keywords: | Antenna selection Delayed channel quality information (CQI) Multi-hop relay (MHR) Multi input multi output (MIMO) M-ary quadrature amplitude modulation (M-QAM) Symbol error probability (SEP) |
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