Modulators – Phase shift keying modulator or quadrature amplitude modulator
Patent
1996-01-02
1997-03-18
Grimm, Siegfried H.
Modulators
Phase shift keying modulator or quadrature amplitude modulator
375261, 375298, 375308, H04L 2736
Patent
active
056126514
ABSTRACT:
This invention pertains to a method for producing high power microwave transmission signals conveying one of a plurality of symbols, wherein a symbol represents a plurality of bits, and also to a modulating array transmitter that operates in accordance with the method. The method includes a first step of applying j bits to a data storage device to address the data storage device to output N bits to N/2 QPSK modulators. Each of the N/2 QPSK modulators receives a subset (a pair) of the N bits. Each of the bit pairs specifies one of up to four phase shifts. Within each of the N/20 PSK modulators, a next step phase modulates a reference (e.g., local oscillator) signal in accordance with a phase shift specified by the received pair of bits. A next step amplifies the outputs of each of the N/2 QPSK modulators to produce respective amplified QPSK modulated signals. A further step combines the amplified OPSK modulated signals by vector addition to produce one of a plurality of symbols, wherein the produced symbol represents a value of the j (even number) input bits. Also disclosed is a BPSK embodiment of the invention, wherein there are N BPSK modulators, each receiving one of the N bits.
REFERENCES:
patent: 4464767 (1984-08-01), Bremer
patent: 5237292 (1993-08-01), Chethik
patent: 5463355 (1995-10-01), Halloran
Grimm Siegfried H.
Loral Aerospace Corp.
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