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| Threshold Setting of Channel Limited Feedback in OFDM System |
| Tang Zhi-hua; Zhu You-tuan; Wei Guo; Zhu Jin-kang |
| Department of Electronic Engineering, Univ. of Sci. & Tech. of China, Hefei 230027, China |
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Abstract In this paper, mathematical expression of channel capacity as well as channel capacity loss due to feedback threshold setting are proposed, which is based on research on resource management in downlink multiuser OFDM systems and limited feedback theory. Three threshold setting schemes are proposed, which are from the aspects of feedback outage probability, capacity loss and feedback utility. Numerical results demonstrate that through setting threshold properly, the feedback can be decreased greatly at the cost of little capacity loss, leading to effective application of resource allocation algorithms in downlink multiuser OFDM systems.
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Received: 29 August 2005
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2007, Vol. 29 
