Minimization of excess bandwidth in pulse amplitude modulated da

Details Minimization of excess bandwidth in pulse amplitude modulated da Minimization of excess bandwidth in pulse amplitude modulated da

1978-11-09

1980-10-07

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

370 19, 370 21, 375 58, H04L 300

Patent

active

042272505

ABSTRACT:
Pulse amplitude modulated data systems typically utilize linear combinations of Nyquist pulses to transmit data signals. Ideally, required bandwidth for the transmitted signal is 1/(2T)=.rho./2L where .rho. is the data rate, T the signaling interval, and L the number of bits per signal. In practice, however, an "excess bandwidth" of at least 10-20 percent is required.
According to the invention, data signals are encoded to produce an encoded signal which can be transmitted over a communications channel having excess bandwidth of merely 2-4 percent. The encoding scheme utilizes linear combinations of characteristic sequences which are known as discrete prolate spheroidal sequences. A transmitter and a corresponding receiver are disclosed.

REFERENCES:
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patent: 3522383 (1970-06-01), Chang
patent: 3678204 (1972-07-01), Harmuth
patent: 3705981 (1972-12-01), Harmuth
patent: 3883767 (1974-09-01), Wolf
patent: 4001563 (1977-01-01), Biel-Charreton et al.
patent: 4001564 (1977-01-01), Biel-Charreton et al.
Harmuth, IEEE Tr. Info., May 1968, vol 1T-14, No. 3.
Schreiber, App. Walsh Functions, 1970 Proceedings, pp. 46-49.
Enomoto, App. Walsh Functions, 1971, Proceedings, pp. 11-17.
H/bner, suprz, pp. 180-191.
Robinson, suprz, pp. 199-202.
Gethoffer, Applications of Walsh Functions, 1973 Proceedings, pp. 194-201.

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