電機資訊學院: 電信工程學研究所指導教授: 鐘嘉德鄒定衡Chou, Ting-HengTing-HengChou2017-03-062018-07-052017-03-062018-07-052014http://ntur.lib.ntu.edu.tw//handle/246246/276439In 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.3498697 bytesapplication/pdf論文公開時間: 2015/2/4論文使用權限: 同意有償授權(權利金給回饋學校)梳狀頻譜分碼多重存取信號旁波壓抑華須哈德瑪零插入正交互譜格雷傅立葉轉換碼唧聲CS-CDMAsidelobe suppressionWalsh-Hadamard codezero insertionorthogonal complementary Golay codeDFT codechirp-like codethesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/276439/1/ntu-103-R01942077-1.pdf