Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Patent
1997-08-29
2000-09-26
Chin, Stephen
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
375264, 375280, 375281, 375322, 375323, 375332, 370280, 370294, 370337, 370347, 370498, H04L 2302, H04L 512, H03D 300, H03K 910
Patent
active
061251488
ABSTRACT:
A method of demodulating voice or data and control information in systems that support multiple modulation schemes modulates voice or data using a first linear modulation scheme, such as 16QAM modulation scheme, and modulates control information using a second linear modulation scheme, for example, QPSK modulation scheme, that has the same symbol rate as that of the first modulation scheme. The first linear modulation scheme has a higher modulation level than the second linear modulation scheme. Information modulated using the second linear modulation scheme, which uses a reduced signal set of the first linear modulation scheme, are demodulated using the same demodulator that is used for demodulating information modulated using the first linear modulation scheme. Also, in-band signalling information within a traffic channel, such as stealing flags, are modulated using the second modulation scheme.
REFERENCES:
patent: 4866395 (1989-09-01), Hotstteter
patent: 5363408 (1994-11-01), Paik et al.
patent: 5369637 (1994-11-01), Richardson et al.
patent: 5535215 (1996-07-01), Hieatt, III
patent: 5537434 (1996-07-01), Persson et al.
patent: 5577087 (1996-11-01), Furuya
patent: 5633873 (1997-05-01), Kay et al.
patent: 5757813 (1998-05-01), Raith
patent: 5839071 (1998-11-01), Johnson
patent: 5909469 (1999-06-01), Frodigh et al.
patent: 5966412 (1999-10-01), Ramaswamy
patent: 5987068 (1999-11-01), Cassia et al.
Johan Skold et al., "Cellular Evolution into Wideband Services", VTC 1995, Jul. 3, 1997.
ITU-T Recommendation V32 "Data Communication Over the Telephone Network" Mar. 1993--Helsinki.
ITU-T Recommendation V.34 "Data Communication Over the Telephone Network" Sep. 1994--Geneva.
Jacobsmyer, J.M.: "An Adaptive Modulation Scheme for Bandwidth-Limited Meteor-Burst Channels" 21.sup.st Century Military Communications--What's Possible?, San Diego, Oct. 23-26, 1988, vol. 3, Oct. 23, 1988, pp. 933-937 IEEE.
Frodigh Carl Magnus
Hook Mikael
Muller Frank
Schramm Peter
Skold Johan
Chin Stephen
Maddox Michael W.
Telefonaktiebolaget LM Ericsson
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