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A Near-Optimal Low-Complexity Transceiver for CP-Free Multi-Antenna OFDM Systems
Chih-Yuan LIN Jwo-Yuh WU Ta-Sung LEE
Publication
IEICE TRANSACTIONS on Communications
Vol.E89-B
No.1
pp.88-99 Publication Date: 2006/01/01 Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.1.88 Print ISSN: 0916-8516 Type of Manuscript: PAPER Category: Wireless Communication Technologies Keyword: OFDM, generalized sidelobe canceller, partially adaptive, pre-equalizer,
Full Text: PDF(968.7KB)>>
Summary:
Conventional orthogonal frequency division multiplexing (OFDM) system utilizes cyclic prefix (CP) to remove the channel-induced inter-symbol interference (ISI) at the cost of lower spectral efficiency. In this paper, a generalized sidelobe canceller (GSC) based equalizer for ISI suppression is proposed for uplink multi-antenna OFDM systems without CP. Based on the block representation of the CP-free OFDM system, there is a natural formulation of the ISI suppression problem under the GSC framework. By further exploiting the signal and ISI signature matrix structures, a computationally efficient partially adaptive (PA) implementation of the GSC-based equalizer is proposed for complexity reduction. The proposed scheme can be extended for the design of a pre-equalizer, which pre-suppresses the ISI and realizes CP-free downlink transmission to ease the computational burden of the mobile unit (MU). Simulation results show that the proposed GSC-based solutions yield equalization performances almost identical to that obtained by the conventional CP-based OFDM systems and are highly resistant to the increase in channel delay spread.
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