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Registered Apparatus and method for modulating data message by employing orthogonal variable spreading factor(OVSF) codes in mobile communication system
이미지 확대
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.
- 11618361 (2006.12.29)
- Publication No.
- 20070104086 (2007.05.10)
- Registration No.
- 7586973 (2009.09.08)
- Country
- UNITED STATES
- Project Code
- 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.