π/4 QPSK modulator

Details π/4 QPSK modulator π/4 QPSK modulator

2005-03-29

2005-03-29

Vo, Don N. (Department: 2631)

Pulse or digital communications

Transmitters

Angle modulation

Reexamination Certificate

active

06873661

ABSTRACT:
A method of π/4-shift QPSK modulation and π/4-shift QPSK modulator are provided. The modulator address symbols from a Precursor section of a register to a first memory portion and from a Postcursor section of the register to a second memory portion at odd times and, address symbols from the Precursor section to said second memory portion and from said Postcursor section to said first memory portion at even times. The modulator uses reversed addressing for Postcursor symbols in accessing the said first and second memory portions.

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patent: 0620667 (1994-10-01), None
Tetsu Sakata et al., A New Fully- Digitalized Pi/4-Shift QPSK Modulator for Personal Communication Terminals, 1993, IEEE, pp. 926-930.*
Tetsu Sakata et al., A New Fully- Digitalized Pi/4-Shift QPSK Modulator for Personal Communication Terminals, 1994, IEICE Transactions on Communications, vol. E77-B, pp. 921-926.*
Sakata et al. “A New Fully-Digitalized PI/4-Shift QPSK Modulator for Personal Communication Terminals” IEICE Transactions on Communications, vol. E77-B, No. 7, Jul. 1, 1994, pp. 921-926, XP000471322, Tokyo, Japan.
Sakata et al. “A New Fully-Digitalized PI/4-Shift QPSK Modulator for Personal Communication Terminals” IEICE Transactions on Communications, vol. E77-B, No. 7, Jul. 1, 1994, pp. 926-930, XP000471322, Tokyo, Japan.

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