Telegraphy – Systems – Alternating or pulsating current
Patent
1977-12-05
1979-01-16
Safourek, Benedict V.
Telegraphy
Systems
Alternating or pulsating current
325 30, 325321, 325323, H04B 162
Patent
active
041350570
ABSTRACT:
A high density bandlimited digital transmission system with a transmitter and a receiver connected by a radio path with an end-to-end channel transfer function selected to form at the receiver either raised cosine pulses or partial response pulses. The transmitter is partitioned or divided into an active pulse forming network and a passive pulse shaping and bandlimiting network. The active and passive networks are concatenated and in combination provide an optimal transmitter-receiver combination for raised cosine or for partial response signaling. Transmit and receive filters provide optimal signal pulse shaping while meeting specified out-of-band signal suppression.
In-phase and quadrature phase carriers (I and Q channels) work with rectangular or half-wave sinusoidal modulating pulses. Further, time-offset or time-coincident pulses on each of the respective I and Q channels are used. Multi-level embodiments are also disclosed. Receivers using time-offset modulation forms allowing coherent detection using VSB and SSB techniques with resulting simplification of the receiver structures. This mode of operation is possible without the use of sideband separation filters at the transmitter. Only the receiver structure is affected. Preferred embodiments are described that closely approach optimal performance and achieve information densities in the range from 1.75 to 4 bits per second per Hertz.
REFERENCES:
patent: 3679977 (1972-07-01), Howson
patent: 3806807 (1974-04-01), Nakamura
patent: 3829779 (1974-08-01), Fujimoto
patent: 3845412 (1974-10-01), Rearwin
patent: 3887768 (1975-06-01), Forney
patent: 3947767 (1976-03-01), Koike
Spaulding, D., "Synthesis of Pulse-Shaping Networks in the Time Domain",Bell System Tech. Journal, vol. 48, Sep. 1969, pp. 2425-2444.
Kabal, P. et al., "Partial-Response Signaling", IEEE Transactions on Communication Technology, vol. COM-23 #9, Sep. 1975, pp. 921-934.
Bayless, Sr. Jon W.
Bellamy, II John C.
Pedersen Robert D.
Arthur A. Collins, Inc.
Masinick Michael A.
Safourek Benedict V.
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