DEVICE AND METHOD FOR GENERATING QUATERNARY COMPLEX QUASI-ORTHOGONAL CODE AND SPREADING TRANSMISSION SIGNAL USING QUASI-ORTHOGONAL CODE IN CDMA COMMUNICATION SYSTEM

摘要

A method for generating a quaternary complex quasi-orthogonal code in a CDMAcommunication system is disclosed. The methodcomprises generating an M-sequence and then generating specific sequenceshaving a good full correlation property with the M-sequence;generating a column permutation function for converting the M-sequence to aWalsh code; generating candidate masks by column shiftingthe specific sequences with the column permutation function; generating quasi-orthogonal code representatives by operating the candidatemasks and the Walsh codes having the same length as that of the candidatemasks; and selecting a quasi-orthogonal code satisfying a partialcorrelation with the Walsh codes, out of the generated quasi-orthogonal coderepresentatives, and selecting a mask related to generation ofthe selected quasi-orthogonal code.