Spectral Sidelobe Properties in CS-CDMA System
Date Issued
2014
Date
2014
Author(s)
Chou, Ting-Heng
Abstract
In this thesis, general constraints on the employed spreading code are developed for comb spectrum code-division multiple access (CS-CDMA) systems to warrant the desirable spectral property that the power spectral sidelobes decay asymptotically as f-2Q-2, where Q is a preassigned positive integer. Precisely, f-4 and f-6-decaying codewords are designed to provide small sidelobes decaying and thus mitigate adjacent channel interference. It is shown that the sidelobe decaying characteristic of the CS-CDMA signal can be properly described by the code index of the underlined zero-insertion Walsh-Hadamard codeword. Finally, unequal magnitude spectral sidelobe decaying codewords are also devised to achieve the desirable spectral property of the fast sidelobe decaying.
Subjects
CS-CDMA
sidelobe suppression
Walsh-Hadamard code
zero insertion
orthogonal complementary Golay code
DFT code
chirp-like code
Type
thesis
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ntu-103-R01942077-1.pdf
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