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| Minimizing Power Scheme with Low Feedback Overhead for Multiuser MIMO-OFDM Systems |
| Xu Lei; Xu Da-zhuan; Zhang Xiao-fei |
| College of Information Science and Technology, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China |
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Abstract This paper utilizes the Karush-Kuhn-Tucher condition of convex programming issue and proposes a minimizing power scheme with low feedback overhead for multiuser MIMO-OFDM systems based on trellis coded modulation. Firstly, the scheme designs the codebook of rate and power and equivalent channel quantization threshold. Secondly, the subcarrier is allocated according to current channel state information and the equivalent channel gain is quantized. Finally, the base station broadcasts the result of resource allocation to users. The simulation results prove that comparing to other schemes the proposed scheme not only saves efficiently energy but also has advantage of low feedback overhead.
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Received: 31 May 2009
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Corresponding Authors:
Xu Lei
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2010, Vol. 32 
