Browsing by Author "Liang, LH"

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A frequency-domain SIR maximizing time-domain equalizer for VDSL systems
(2005)
Lin, YP
;
Liang, LH
;
Chung, PJ
;
Phoong, SM
;
電控工程研究所
In this paper we propose a semi-blind time domain equalizer (TEQ) design method that maximize SIR (signal-to-interference ratio) in frequency domain for VDSL systems. The proposed method exploits the training symbols in VDSL initialization using an eigen approach. Unlike earlier eigen based TEQ designs, the proposed method does not require the channel impulse response. The TEQ can be obtained by computing an eigenvector of a positive definite matrix that depends only on the averaged received VDSL symbols. Examples will be given to demonstrate that the proposed TEQ design method can effectively shorten the channel impulse response, and achieve very good bit rates with only a small number of training symbols.
An semi-blind eigen approach to time-domain equalizer design for VDSL systems
(2005)
Lin, YP
;
Liang, LH
;
Phoong, SM
;
電控工程研究所
;
Institute of Electrical and Control Engineering
In this paper we propose a semi-blind time domain equalizer (TEQ) design method for VDSL system. In the VDSL system frequency division duplex is used to separate upstream and downstream signals. In downstream or upstream transmission, only half the tones carry data and the other half are null tones. The proposed semi-blind method exploits the null tones of VDSL training symbols. It does not require the channel impulse response nor the channel noise statistics, like all eigen approaches proposed earlier. Example will be given to demonstrate that proposed TEQ design method can effectively shorten the channel impulse responses for VDSL application.