Performance of Cross-Layer Design with Power Allocation in Space-Time Coded MIMO Systems |
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| Authors: | Yang Dingli Liu Yan Yu Xiangbin |
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| Institution: | 1. Faculty of Electronic and Electrical Engineering, Huaiyin Institute of Technology, Huaian, 223003, P.R.China
2. College of Electronic Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, P.R.China |
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| Abstract: | A cross-layer design(CLD)scheme with combination of power allocation,adaptive modulation(AM)and automatic repeat request(ARQ)is presented for space-time coded MIMO system under imperfect feedback,and the corresponding system performance is investigated in a Rayleigh fading channel.Based on imperfect feedback information,a suboptimal power allocation(PA)scheme is derived to maximize the average spectral efficiency(SE)of the system.The scheme is based on a so-called compressed SNR criterion,and has a closed-form expression for positive power allocation,thus being computationally efficient.Moreover,it can improve SE of the presented CLD.Besides,due to better approximation,it obtains the performance close to the existing optimal approach which requires numerical search.Simulation results show that the proposed CLD with PA can achieve higher SE than the conventional CLD with equal power allocation scheme,and has almost the same performance as CLD with optimal PA.However,it has lower calculation complexity. |
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| Keywords: | cross-layer design (CLD) power allocation (PA) space-time coding spectral efficiency (SE) packet error rate (PER) |
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