Multi-carrier spread spectrum modulation with reduced dynamic range
- 23 December 2002
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 2 (10903038) , 914-917
- https://doi.org/10.1109/vetec.1996.501444
Abstract
Multi-carrier (MC) modulation has been proposed for code-division multiple access (CDMA) mobile radio communications, by modulating an identical symbol on multiple carriers of same magnitude. Certain phase offsets assigned to each carrier define a code that is given to a specific user. We introduce a CDMA system based on multi-carrier spread spectrum (MC-SS) with one identical code for all users. In general, the employment of a multi-carrier transmission technique would increase the dynamic range of the correspondent lowpass time signal, and therefore would require a highly linear power amplifier. It is shown that by carefully designing the code of a MC-SS signal a significant decrease of several orders of magnitude in the dynamic range can be obtained. The dynamic range of the resulting multi-carrier signal is of the same range as of conventional direct-sequence spread-spectrum (DS-SS) signals using OQPSK combined with raised-cosine filtering. We therefore show that MCSS CDMA is an alternative to existing DS-SS techniques proposed for mobile cellular radio and PCS, and should be considered for future mobile applications.Keywords
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