Browsing by Author "Chen, Jiunn-Tsair"

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Low-Cost Perturbation-Based ICI Equalizers for OFDMA Mobile Systems
(2012-11-01)
Lin, Hsin-De
;
Sang, Tzu-Hsien
;
Chen, Jiunn-Tsair
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
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.