Title:
SYNCHRONOUS DETECTOR AND SYNCHRONIZING METHOD FOR DIGITAL COMMUNICATION RECEIVER
Document Type and Number:
WIPO Patent Application WO/1995/035615
Kind Code:
A1
Abstract:
A synchronous detecting method in which the transfer function of a propagation path is estimated by regarding the information symbols adjacent to pilot signals as known symbols and using the information symbols as pseudo-pilot signals. The method includes a step of estimating the transfer function by using the pilot signals, a step of performing interpolation synchronous detection of part of the information symbols by using the estimated transfer function, a step of storing the result of the interpolation synchronous detection as pseudo-pilot signals, a step of reestimating the transfer function related to information symbols corresponding to the pseudo-pilot signals from the pseudo-pilot signals and the received signals corresponding to the pseudo-pilot signal, regarding the pseudo-pilots as known correct signals, and a step of performing interpolation synchronous detection of each information symbol by using the reestimated transfer function. Thus, the detection characteristic can be improved by estimating the transfer function with high accuracy even when the number of symbols per pilot signal is small.
Inventors:
HIGASHI AKIHIRO (JP)
ADACHI FUMIYUKI (JP)
OHNO KOJI (JP)
SAWAHASHI MAMORU (JP)
ADACHI FUMIYUKI (JP)
OHNO KOJI (JP)
SAWAHASHI MAMORU (JP)
Application Number:
PCT/JP1995/001229
Publication Date:
December 28, 1995
Filing Date:
June 21, 1995
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
HIGASHI AKIHIRO (JP)
ADACHI FUMIYUKI (JP)
OHNO KOJI (JP)
SAWAHASHI MAMORU (JP)
HIGASHI AKIHIRO (JP)
ADACHI FUMIYUKI (JP)
OHNO KOJI (JP)
SAWAHASHI MAMORU (JP)
International Classes:
H04L25/02; H04L7/08; (IPC1-7): H04L27/22
Foreign References:
| JPH0746284A | 1995-02-14 |
Other References:
IEICE TECHNICAL RESEARCH REPORT, Vol. 94, No. 312, 28 October 1994, (Tokyo), AKIHIRO HIGASHI, TSUTOMU TAGUCHI, KOJI ONO, "Characteristics of an Interpalation Type Synchronous Detector RAKE in DC/CDMA", p. 57-62.
SEASONAL REPORT OF COMMUNICATION SYNTHESIS INSTITUTE, Vol. 37, No. 1, February 1991, (Tokyo), MASAICHI MIHEI, "System for Compensating Fading Distortion in Multivalue QAM", p. 87-98.
IEICE TRANSACTIONS, J72-B-II, No. 1, January 1989, (Tokyo), MASAICHI MIHEI, "System for Compensating Fading Distortion in Land Communication 16QAM", p. 7-15.
See also references of EP 0715440A4
SEASONAL REPORT OF COMMUNICATION SYNTHESIS INSTITUTE, Vol. 37, No. 1, February 1991, (Tokyo), MASAICHI MIHEI, "System for Compensating Fading Distortion in Multivalue QAM", p. 87-98.
IEICE TRANSACTIONS, J72-B-II, No. 1, January 1989, (Tokyo), MASAICHI MIHEI, "System for Compensating Fading Distortion in Land Communication 16QAM", p. 7-15.
See also references of EP 0715440A4
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