Pulse or digital communications – Repeaters – Testing
Patent
1988-07-15
1989-11-21
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 39, 375 96, 375102, H03H 1700, H04J 1100, H04L 2302
Patent
active
048827371
ABSTRACT:
A signal transmission method according to the principle of quadrature/amplitude modulation, in which digital data occurring at a time interval T are formed into a transmit signal with the aid of pulse shapers (3a, 3b) having a given unit pulse response r(t) in a transmitter (4), the transmit signal is transmitted by means of a carrier oscillation via a channel (5) having a channel unit pulse response h(t), when an additive white noise w(t) is superimposed on it, so that a receive signal y(t) is present in a receiver (10), and in which the receive signal y(t) is preprocessed by channel-matched filters (7 a, 7b) in the receiver (10), has channel-matched filters (7a, 7b) which are matched to a filter cascade H(t) formed by pulse shapers (3a, 3b) and channel (5) as a whole. The channel-matched filters f(7a, 7b) are preferably transverse filters the data points of which are at a time interval .DELTA.T which is small in relation to the time interval T of the digital data. An estimation of the channel unit pulse response h(t) is determined in that the unit pulse response of the filter cascade H(t) is convoluted with a filter r.sup.-1 (t) which is inverse to the pulse shaper.
REFERENCES:
patent: 4308618 (1981-12-01), Levy et al.
patent: 4631735 (1986-12-01), Qureshi
patent: 4675880 (1987-06-01), Davarian
International Conference on Communications, ICC '79, Boston, U.S., 10-14, Jun. 1979, vol. 2, IEEE (NY, US) C. C. W. Wong et al., pp. 25.
IEE Proceedings, section A a I, vol. 130, No. 5, Part F, Aug. 1983, (Old Woking, Surrey, GB) A. P. Clark et al., pp. 368-376.
BBC Brown Boveri AG
Safourek Benedict V.
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