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J Electromagn Eng Sci > Volume 7(1); 2007 > Article
Journal of the Korean Institute of Electromagnetic and Science 2007;7(1):1-6.
DOI: https://doi.org/10.5515/JKIEES.2007.7.1.001   
Design of a Novel Multi-Dimensional HCOC Multi-code Spread Spectrum System Using Pre-coding Technique for High Speed Data Transmission of DS-CDMA
Hyung-Yun Kong, Dong-Un Lee
Dept. of Electrical Engineering, University of Ulsan
Abstract
Recently, Mc(Multi-code) modulation/demodulation(modem) technique has been explored for high speed data transmission in wireless environment. The conventional Mc modem generates some side effects such as allocating Walsh codes, which motivates to propose a novel Mc modem method with sub-code. Our proposed system should expanded the size of sub-code to provide high-rate data transmission, which also affect adversely to the performance of the system with high PAPR(Peak to Average Power Ratio). Thus, in this paper, we propose a novel pre-coded Multi-Dimensional HCOC(High Capacity Orthogonal Code) Mc modem technique to reduce the high PAPR, which enables the performance improvement. This proposed system can be easily designed by concatenating HCOC Mc modem with the generic Mc modem. The pre-coding technique that is used in this paper is CAC(Constant Amplitude Coding), that helps the system maintain the constant transmission power and reduce the maximum transmission power.
Key words: Multidimensional, HCOC, Multi-Code, Constant Amplitude Coding, DS-CDMA
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