Registered
Apparatus and method for modulating data message by employing orthogonal variable spreading factor(OVSF) codes in mobile communication system
- Inventors
-
Jae Heung Kim, Kim Tae Joong, Jung-Im Kim, Shim Jae Ryong, Bang Seung Chan, Chae Jong- Suk, Lee Hyuckjae, Narmhee Lee
- Application No.
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11618361 (2006.12.29)
- Publication No.
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20070104086 (2007.05.10)
- Registration No.
- 7586973 (2009.09.08)
- Country
- UNITED STATES
- Project Code
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99MR1100, BASYS DataMig,
Lee Hyuckjae
- Abstract
- A method for converting source data to a channel-modulated signal having a plurality of pairs of in-phase (I) and quadrature-phase (Q) data in a mobile station, wherein the mobile station uses at least one channel, includes the steps of: a) encoding the source data to generate at least one data part and a control part; b) generating at least one spreading code to be allocated to the channel, wherein each spreading code is selected on the basis of a data rate of the data part and the control part and spreading codes are selected so that two consecutive pairs of the I and Q data are correspondent to two points located on same point or symmetrical with respect to a zero point on a phase domain; and c) spreading the control part and the data part by using the spreading code, to thereby generate the channel-modulated signal. The method is capable of improving a power efficiency of a mobile station by reducing a peak-to-average power ratio in a mobile communication system.