Browsing by Author "LIU, GS"

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A NEW VARIABLE FRACTIONAL SAMPLE DELAY FILTER WITH NONLINEAR INTERPOLATION
(1992-02-01)
LIU, GS
;
WEI, CH
;
交大名義發表
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電控工程研究所
;
National Chiao Tung University
This paper presents a finite impulse response (FIR) filter that can synthesize any fractional sample delay by nonlinear interpolation technique. Analytically closed-form solutions for the tap weights of such an FIR filter and their frequency responses are presented.
HIGH-SPEED REED-SOLOMON DECODER FOR CORRECTING ERRORS AND ERASURES
(1993-08-01)
WEI, CH
;
CHEN, CC
;
LIU, GS
;
電控工程研究所
;
電信研究中心
A Reed-Solomon decoder for errors-and-erasures correction, based on a new algebraic decoding algorithm, is presented. This high-speed decoder requires only n clock cycles for decoding each received n-symbol block. A serial structure that requires very few multipliers and provides a general expression to calculate the coefficients of the erasure-locator polynomial is also presented. A (15, 11) RS decoder and its shortened version (7, 3) RS decoder are used as design examples to illustrate the operating procedure of the new decoding algorithm.
MULTIPATH-FADING EFFECTS ON CARRIER RECOVERY OF BPSK SIGNAL IN DIGITAL RADIO
(1993-10-01)
LIU, GS
;
WEI, CH
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電控工程研究所
;
電信研究中心
;
Institute of Electrical and Control Engineering
Tracking performance of the I-Q carrier recovery loop for BPSK signal in bandlimited channel with multipath interference is analysed. The multipath fading channel is characterised by the Rummler's model (a simplified three-ray model) for fine-of-sight digital radio system. A closed-form expression for the phase-error variance related to the multipath interference, intersymbol interference and channel noise is derived. Excess phase offset induced from the multipath interference is also examined. The closed-form expression of the jitter variance can be evaluated numerically to assess the degradation of synchroniser performance. Asymptotic limits of the performance are also discussed.
PROGRAMMABLE FRACTIONAL SAMPLE DELAY FILTER WITH LAGRANGE INTERPOLATION
(1990-09-13)
LIU, GS
;
WEI, CH
;
電控工程研究所
;
電信研究中心
;
Institute of Electrical and Control Engineering