H - Electricity – 03 – C
Patent
H - Electricity
03
C
354/106, 332/27,
H03C 1/60 (2006.01) H04L 25/497 (2006.01) H04L 27/02 (2006.01)
Patent
CA 1162620
D-21,850 METHOD AND APPARATUS FOR CONVERTING BINARY INFORMATION INTO A SINGLE-SIDEBAND 3-LEVEL CORRELATIVE SIGNAL by Adam Lender ABSTRACT OF THE DISCLOSURE 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 frequen- cies 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.
350221
Gte Automatic Electric Incorporated
R. William Wray & Associates
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