Method for deciding region of PI/4 shift quadriphase shift keyin

Details Method for deciding region of PI/4 shift quadriphase shift keyin Method for deciding region of PI/4 shift quadriphase shift keyin

1991-07-09

1993-07-20

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

329304, H04L 2722

Patent

active

052300099

ABSTRACT:
First two dimensional plane is defined by phase of modulated signal and first vector corresponding to first signal point to be decided is defined. Then, first inner product by the first vector and second vector corresponding to last decided signal point is made and the second vector is transformed into third vector which is ninety degrees advanced. Next, second inner product of the first vector and third vector is made and the region of the first signal is decided in the two dimensional plane in accordance with the first and second inner product.

REFERENCES:
patent: 4631486 (1986-12-01), Snell
patent: 4881049 (1989-11-01), Yagi
patent: 5057786 (1991-10-01), Yoshikawa
patent: 5067139 (1991-11-01), Baker et al.
patent: 5079512 (1992-01-01), Muto

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