Method and apparatus for converting binary information into a si

Details Method and apparatus for converting binary information into a si Method and apparatus for converting binary information into a si

1979-04-30

1983-09-20

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 39, 375 43, H04L 2534, H04L 2702

Patent

active

044060092

ABSTRACT:
A transmitter converts an incoming bit stream into a single-sideband signal for transmission over a band-limited channel such as a digital radio. The incoming bit stream is digitally processed to obtain both in-phase and quadrature-phase 3-level correlative signals. The two correlative signals are separately band limited to a passband having a bandwidth that is about one-fourth the bit rate of the original bit stream, and these band-limited signals are then separately analog modulated, respectively, using in-phase and quadrature-phase carrier frequencies which are derived from a carrier oscillator. The products from the analog modulation process are then combined in a summing circuit to derive the single-sideband signal. At the receiver, the single-sideband signal is analog demodulated using a carrier frequency that is at either end of the single-sideband frequency spectrum, i.e., C.+-.1/4T Hz where C is the carrier, frequency in Hz and 1/T is the cut-off frequency in Hz and is numerically equal to the bit rate in bits per second (BPS). The lower sideband is selected by a low-pass filter and the signal thus obtained is modified duobinary. By rectifying and slicing the modified duobinary signal the original data is recovered.

REFERENCES:
patent: 3139615 (1964-06-01), Aaron
patent: 3588702 (1971-06-01), Tisi
patent: 3846583 (1974-11-01), Boulter
patent: 3947767 (1976-03-01), Koike et al.
Proceeding of IRE; vol. 44, No. 12, Dec. 1956, pp. 1703-1705 "A Third Method of Generation and Detection of SSB Signals," Donald K. Weaver, Jr.

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