Transmitter and receiver for an orthogonally multiplexed qam...

Details Transmitter and receiver for an orthogonally multiplexed qam... Transmitter and receiver for an orthogonally multiplexed qam...

H - Electricity

04

J

363/24, 328/0.1

H04J 3/02 (2006.01) H04J 4/00 (2006.01) H04L 27/26 (2006.01)

Patent

CA 1134519

Abstract of the Disclosure: In a transmitter for digitally converting PAM signals, 2L in number, of a common slow sampling rate of 1/T hertzes to an orthogonally multiplexed QAM signal of a fast sampling rate of N/T hertzes, N/2-point input data into which the PAM signals are pre-processed with addition thereto of dummy signals, only (N/2 - L) in number, are supplied to at least one N/2-point ODFT (offset discrete Fourier transform) processor (61), a pair of which (61, 62) must have been an N-point OFDT processor accompanied by switches controlled at a T/2-second period. After caused to pass through respective filter units of a bank (71). N/2-point output data are time-division multiplexed into the QAM signal. The filter units may either be complex band-pass or real low-pass filter units. A receiver comprises similar parts and carries out entirely reversed operation.

346089

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