Pulse or digital communications – Repeaters – Testing
Patent
1981-05-01
1983-09-06
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
371 2, 370 21, H03K 1311
Patent
active
044033311
ABSTRACT:
A method of developing waveforms having the energy therein concentrated within a limited bandwidth and modems for generating, transmitting, and receiving digital data utilizing such waveforms as carriers. A set of mutually orthogonal basis signals are selected to maximize their energies within the channel, each is binary coded and stored in the modem. A set of optimized coefficients is stored and utilized to weight each basis function in a coding arrangement to define bytes of digital data. The coded and weighted basis functions for each successive byte are summed to form a composite signal and transmitted over the channel as an analog waveform. Stored basis signals at the receiving end are correlated with the received waveform to thereby extract the coefficients which are decoded to reproduce the transmitted bytes. Both coding gain and reduction of intersymbol interference is achieved.
REFERENCES:
patent: 3377625 (1968-04-01), Filipowsky
patent: 3384715 (1968-05-01), Higuchi et al.
patent: 3882485 (1975-05-01), Bluestein et al.
patent: 4327439 (1982-04-01), Gockler et al.
Halpern Peter H.
Mallory Peter E.
Chin Stephen
Microdyne Corporation
Safourek Benedict V.
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