| Summary: | 碩士 === 大葉大學 === 電機工程學系 === 98 === A modified LAS Large area synchronized code, LAS code, is proposed for CDMA systems, where the LAS code is made from large area code, LA, and LS code. By examining the autocorrelation function and cross correlation, the original LAS code.
Because the zero string in LAS code is not able provide processing gain in the dispreding process, while only non-zero string provide processing gain in dispreading process. Therefore, in this thesis we are investigate the measures to improve the problem so that improvements LAS code autocorrelation function of the zero window disappears, but gain access to better treatment. Next, after analysis, we found that the improved LAS code better than the original LAS code.
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