Method and apparatus of 8PSK modulation

Details Method and apparatus of 8PSK modulation Method and apparatus of 8PSK modulation

2007-06-26

2007-06-26

Payne, David C. (Department: 2611)

Pulse or digital communications

Transmitters

Angle modulation

C375S279000, C375S240000, C332S103000, C382S232000

Reexamination Certificate

active

10373485

ABSTRACT:
8PSK modulation methods and apparatuses are provided. In a first embodiment, product factors of symbol vectors and a coefficient of a shape filter are stored in a table and compressed by 8 times based on a law of a trigonometric function, wherein a method of table looking-up is used to replace a multiplication operation. In a second embodiment, all states of 8PSK modulation are stored in a table after shape filtering, and then the data of the states stored in the table are compressed based on a corresponding relationship of a law of a trigonometric function and an electrical level diversity, and then a table looking-up operation is performed. In a third embodiment, new modulated vectors are stored in a modulated phase table after simple 8PSK modulation and phase rotation, the modulated phase table is compressed by 4 times, and new modulated vectors are obtained by a table looking-up operation and data processing. Then, shape filtering is performed by utilizing a RAM coefficient filter. The 8PSK modulation methods and apparatuses are compatible with GSM systems and are capable of providing sufficient capability of data services and sufficiently extending a life cycle of prior GSM systems. It allows a service agent not only to save investment, but also to provide competitive services.

REFERENCES:
patent: 5929454 (1999-07-01), Muraki et al.
patent: 5959872 (1999-09-01), Son
patent: 5999355 (1999-12-01), Behrens et al.
patent: 6175599 (2001-01-01), Lyon et al.
patent: 6222885 (2001-04-01), Chaddha et al.
patent: 6240144 (2001-05-01), Ha
patent: 6553056 (2003-04-01), Tsumura
patent: 7046738 (2006-05-01), Dent
patent: 1 022 874 (2000-07-01), None
patent: 11215200 (1999-08-01), None

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