Performance Evaluation of Resource Allocation Scheme Based on Hierarchical Constellation in Cellular Networks

Ki-Ho LEE  Hyun-Ho CHOI  Dong-Ho CHO  

IEICE TRANSACTIONS on Communications   Vol.E93-B   No.5   pp.1289-1292
Publication Date: 2010/05/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.1289
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
hierarchical constellation,  resource allocation,  adaptive modulation,  

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Hierarchical constellations offer a different property of robustness to the multiple bits that construct a symbol according to channel errors. We apply the characteristics of hierarchical constellations to a multi-user cellular system that has limited modulation levels, in order to improve cell capacity. We propose an adaptive resource allocation scheme based on the hierarchical constellation in which a symbol is shared by multiple users and each bit in a symbol is allocated adaptively according to the channel condition of each user. The numerical results show that the proposed resource allocation scheme provides mobile users with higher modulation levels so that the cell capacity is improved.