Low-Cost Perturbation-Based ICI Equalizers for OFDMA Mobile Systems

Hsin-De LIN  Tzu-Hsien SANG  Jiunn-Tsair CHEN  

IEICE TRANSACTIONS on Communications   Vol.E95-B   No.11   pp.3509-3518
Publication Date: 2012/11/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.3509
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
orthogonal frequency-division multiple access (OFDMA),  doubly-selective fading channel,  intercarrier interference (ICI),  ICI cancellation,  

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For advanced mobile communication systems that adopt orthogonal frequency-division multiple access (OFDMA) technologies, intercarrier interference (ICI) significantly degrades performance when mobility is high. Standard specifications and concerns about complexity demand low-cost methods with deployment readiness and decent performance. In this paper, novel zero forcing (ZF) and minimum mean-square error (MMSE) equalizers based on per-subcarrier adaptive (PSA) processing and perturbation-based (PB) approximation are introduced. The proposed equalizers strike a good balance between implementation cost and performance; therefore they are especially suitable for OFDMA downlink receivers. Theoretical analysis and simulations are provided to verify our claims.