H - Electricity – 04 – B
Patent
H - Electricity
04
B
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H04B 1/10 (2006.01) H04B 7/00 (2006.01)
Patent
CA 1280472
"Digital Demodulation System Having Independently Operating Cross-Polarization Cancellers" ABSTRACT OF THE DISCLOSURE In a digital radio transmission in which first- and second-channel radio frequency digital signals are transmitted respectively on orthogonally polarized radiowaves and first and second IF signals are derived respectively from the first- and second-channel RF signals. The second IF signal is proportioned in response to a control signal and subtractively combined with the first IF signal. A main digital demodulator provides demodulation on the combined IF signals to generate a main (N+1)-bit output and derives an N-bit data signal from N higher significant bits of the (N+1)-bit output and an error component from the LSB of the main (N+1)-bit output. An auxiliary digital demodulator provides demodulation on the second IF signal to generate an auxiliary (N+1)-bit output and derives a data component of the second channel from the MSB of the auxiliary (N+1)-bit output. The derived error and data components are supplied to a correlator to generate the control signal.
565324
Corporation Nec
Smart & Biggar
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