Multiplex communications – Wide area network – Packet switching
Patent
1982-01-26
1984-08-07
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
1791702, H04B 320
Patent
active
044647468
ABSTRACT:
In the duplex transmission of data signals over two-wire transmission paths the phenomenon of echo-signals is encountered, while simultaneously intersymbol interference occurs between the data symbols themselves. In order to reduce the influence of both the echo signals, and the intersymbol interference, the arrangement comprises a random access memory (16) which produces a correction value (c(i)) at each sampling instant to correct the received data signal. The memory is addressed from registers (13, 14) and a counter (15), the contents of the registers being determined by the data ssymbols transmitted last and the data symbols received last, respectively. A D-A converter (19) converts the correction value into a correction signal (c(t)), which in a difference producer (20) is subtracted from the received data signal. A sampling arrangement (21) samples the corrected received data signal. After D-A conversion (22) and multiplication (17) by a predetermined factor .alpha. each sample furnishes a number by which the correction value is changed to match it to the value of the pulse distortion at the sampling instant.
REFERENCES:
patent: 3735055 (1973-05-01), Thomas
patent: 3821494 (1974-06-01), Besseyre
patent: 4334128 (1982-06-01), Snijders
patent: 4355214 (1982-10-01), Levy et al.
patent: 4362909 (1982-12-01), Snijders et al.
Kalfs Johannes J. W.
Snijders Wilfred A. M.
van Gerwen Petrus J.
Briody Thomas A.
Olms Douglas W.
Rokoff Kenneth I.
Streeter William J.
U.S. Philips Corporation
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