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Low-Cost Perturbation-Based ICI Equalizers for OFDMA Mobile Systems
Hsin-De LIN Tzu-Hsien SANG Jiunn-Tsair CHEN
IEICE TRANSACTIONS on Communications
Publication Date: 2012/11/01
Online ISSN: 1745-1345
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.