Sub-carrier Allocation and Power Control in Multi-user Multi-rate OFDM Systems

Wu Lin-jun; Li Yan-wen

doi:10.3724/SP.J.1146.2006.01512

Volume 29 Issue 8

Jan. 2011

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Wu Lin-jun, Li Yan-wen. Sub-carrier Allocation and Power Control in Multi-user Multi-rate OFDM Systems[J]. Journal of Electronics & Information Technology, 2007, 29(8): 1911-1915. doi: 10.3724/SP.J.1146.2006.01512

Citation:

Wu Lin-jun, Li Yan-wen. Sub-carrier Allocation and Power Control in Multi-user Multi-rate OFDM Systems[J]. Journal of Electronics & Information Technology, 2007, 29(8): 1911-1915. doi: 10.3724/SP.J.1146.2006.01512

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Sub-carrier Allocation and Power Control in Multi-user Multi-rate OFDM Systems

doi: 10.3724/SP.J.1146.2006.01512

Received Date: 2006-10-09
Rev Recd Date: 2007-03-28
Publish Date: 2007-08-19

Abstract

Abstract

Based on the performance analysis of the Orthogonal Frequency Division Multiplexing (OFDM) system, this paper proposes a scheme for sub-carrier allocation and power control in a multi-user multi-rate OFDM system. For the downlink transmission employing P-QAM, if all Channel State Information (CSI) are known, under the constraint of the Quality of Service (QoS) of each user being satisfied, the CBR (Constant Bit Rate) users are allocated with channels prior to the VBR (Variable Bit Rate) users. The VBR users are allocated with remain channels with the rule of link gain maximization. Signal powers are assigned with the water-filling policy: the larger is the link gain of the sub-channel, the more power is assigned. Simulation results show that the proposed sub-carrier allocation and power distribution scheme can achieve higher system capacity than Jangs method.

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References(1)

References

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