Browsing by Author "Tsai, Chueh-An"

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Channel Estimator and Aliasing Canceller for Equalizing and Decoding Non-Cyclic Prefixed Single-Carrier Block Transmission via MIMO-OFDM Modem
(2011-01-01)
Cheng, Shau-Yu
;
Tsai, Chueh-An
;
Hsu, Terng-Yin
;
資訊工程學系
;
Department of Computer Science
Without a cyclic prefix (CP), most single-carrier (SC) transmissions can not adopt frequency-domain equalizer (FDE) directly. This work utilizes frequency-domain channel estimator (FD-CE) and decision-feedback aliasing canceller (DF-AC) to produce single-FFT SC-FDE. In this way, non-CP single-carrier block transmission (SCBT) can be decoded using sphere decoder of MIMO-OFDM modems to support multimode and backward compatibility under an acceptable complexity in IEEE 802.11 very high throughput (VHT). An N-point FFT is sufficient to measure channel frequency responses (CFR) from L-sample preambles (L <= N/2). And then, M-bit block codes (M <= L) are decodable over frequency domains with DF-AC's help. Simulations and measurements imply that this work can ensure adequate performance, even if there is no CP existed against the distortions of multipath propagation.