Biphase shift keying modulation circuit having constant envelope

Details Biphase shift keying modulation circuit having constant envelope Biphase shift keying modulation circuit having constant envelope

1991-10-03

1992-09-15

Grimm, Siegfried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

Including logic element

375 55, 375 67, H04L 2720

Patent

active

051481278

ABSTRACT:
A biphase shift keying (BPSK) modulation circuit for digital data transmission capable of preventing occurrence of signal distortion, even in phase shifting positions upon a power amplification of modulation signal, by providing a constant envelope characteristic to the modulation signal during the modulation. The BPSK modulation circuit has a clock input receiving a system clock, a data generation device connected to receive the system clock for providing random digital data in synchronization with the system clock, a data conversion device connected to receive the system clock and an output of the data generation device, for providing an in-phase signal component and a quadra-phase signal component in synchronization with the system clock, and a modulation device connected to receive both the in-phase and quadra-phase signal components from the data conversion device, for providing a phase modulation signal of constant envelope on a given carrier-wave signal for the digital data transmission. The in-phase signal component is processed in a double-balanced modulation with the carrier-wave and the quadraphase signal component is processed in a single-balanced modulation with a phase-shifted signal of the carrier-wave.

REFERENCES:
patent: 4748641 (1988-05-01), Dapper

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