Method and apparatus of 8PSK modulation
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United States of America Patent
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Jun 26, 2007
Grant Date -
Sep 18, 2003
app pub date -
Feb 24, 2003
filing date -
Aug 31, 2000
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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.
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- HUAWEI TECHNOLOGIES CO., LTD.
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Qian, Lai | Shen-Zhen, CN | 1 | 3 |
Wang, Jing | Shen-Zhen, CN | 1507 | 11315 |
Yu, Lin | Shen-Zhen, CN | 84 | 742 |
Zhang, Qiang | Shen-Zhen, CN | 706 | 4589 |
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