Multiplex communications – Wide area network – Packet switching
Patent
1987-01-12
1989-05-30
Ng, Jin F.
Multiplex communications
Wide area network
Packet switching
379410, H04B 323
Patent
active
048357650
ABSTRACT:
An arrangement for full-duplex data transmission over a two-wire circuit (1) comprises a transmit channel (2) connected to a baseband data transmitter (6) and including a smearing filter (18), a receive channel (3) connected to a baseband data receiver (9) and including a complementary smearing filter (19), a hybrid junction (4), an echo canceller (14) with an adaptive filter (15) and an adjusting circuit (16), and a combining circuit (17) inserted in the receive channel (3). Despite the application of the smearing filters (18, 19) the complexity of the echo canceller (14) is not increased as the arrangement comprises first and second delay means (20, 21) with a delay (D) corresponding to the signal delay of the cascade connection of the smearing filters (18, 19), the first delay means (20) having been inserted in a first signal path from the output of data transmitter (6) to the adjusting circuit (16) and the second delay means (21) having been inserted in a second signal path from the output of data transmitter (6) via the adaptive filter (15) and the combining circuit (17) to a point (P) in the receive channel (3) where the residual signal to be applied to the adjusting circuit (16) is tapped, and the complementary smearing filter (19) in the receive channel (3) has been inserted between the hybrid junction (4) and the tapping point (P) for the residual signal.
REFERENCES:
patent: 4117277 (1978-09-01), Van den Elzen et al.
patent: 4587382 (1986-05-01), Yang
patent: 4672633 (1987-06-01), Claasen et al.
"Results of Experiments with a Digital Hybrid in Two-Wire Digital Subscriber Loops", B. Aschrafi et al., NTG-Fachber (Germany), vol. 73, 1980, pp. 21-5.
G. F. M. Beenker et al., "Design of Smearing Filters for Data Transmission Systems", IEEE Transactions on Communications, vol. Com-33, No. 9, Sep. 1985, pp. 955-963.
P. J. Van Gerwen et al., "Design Consideration for a 144 Kbit/s Digital Transmission Unit for the Local Telephone Network", IEEE Journal on Selected Areas in Communications, vol. Sac-2, No. 2, Mar., 1984, pp. 314-323.
Bergmans Johannes W. M.
Claasen Theodoor A. C. M.
van Gerwen Petrus J.
Barschall Anne E.
Briody Thomas A.
Haken Jack E.
Ng Jin F.
U.S. Philips Corporation
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