Transmission of multiple carrier signals in a nonlinear system

Details Transmission of multiple carrier signals in a nonlinear system Transmission of multiple carrier signals in a nonlinear system

1991-02-01

1993-09-28

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

359184, 332106, H04L 2704

Patent

active

052492010

ABSTRACT:
A narrow band complex input signal, typically having multiple independently modulated carriers, is processed to produce an output signal which, while containing the information in the input signal, is not an amplitude dependent signal, and thus can be transmitted through nonlinear media, such as a saturated power amplifier, as a less expensive and more power-efficient alternative over a conventionally required linear power amplifier. The process separates the multiple input signals into an amplitude-limited angle-modulated carrier component and an envelope component, and then combines these components by a form of pulse-duty-factor modulation such as pulse-duration modulation, at a sufficiently high sampling rate. The combined signal is input to a nonlinear power amplifier. Unwanted sidebands are rejected by bandpass filtering at the amplifier output so as to pass only the carrier and its signal bandwidth. The process can include an optical link interposed in the limited carrier path, utilizing suitable modulation and demodulation at the link input/output. A multiple amplifier embodiment utilizes a bank of parallel nonlinear amplifiers, each of which is driven by a pulse modulator. The amplitude-limited angle-modulated carrier is distributed to the modulators where envelope information is imposed in the form of interleaved sequential pulse-duty-factor modulation. The combined outputs of the nonlinear amplifiers provide the ultimate peak envelope power for transmission.

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