The Design And Application Of Zero Correlation Zone Punctured Complementary Sequence Pairs Sets

The performance of CDMA communication system is mainly affected by multipath interference and multiple access interference.Therefore it is need to improve the correlation properties of spreading sequences to reduce interference,meet the system requirements for the amount of users.The key problem of spread spectrum technology is the main contents of this paper: How to design the spread spectrum sequences with high capacity and good correlation properties.Complementary sequences have good correlation properties,which can completely eliminate the interference,but the number of sequences is limited.Then the number of users is limited.The ZCZ sequences which satisfies the requirement of spreading sequences for QS-CDMA communication system have good correlation properties in a certain allowable range.The punctured sequences pairs overcome the limitation of the traditional sequences,and allow to send and receive different sequences in communication system.The advantages of these three kinds of spreading sequences are not conflict.Thus this paper combines three types of spread spectrum sequences,and designs spread spectrum sequences suitable for QS-CDMA communication system,which can enrich the space of the spread spectrum sequence.Firstly,this paper deeply studies the punctured and ZCZ punctured periodic complementary sequence pairs sets.Then on this basis,combining the perfect punctured binary sequences pairs and orthogonal matrix by specific combination method,through interleaving iteration technique and novel inverse Gray mapping,the ZCZ punctured quaternary periodic complementary sequence pairs sets are constructed.The results reach the theoretical limits.Again,based on ZCZ punctured quaternary periodic complementary sequence pairs sets,the ZCZ punctured sixteen periodic complementary sequence pairs sets are obtained through specific mapping.This result makes the ZCZ punctured periodic complementary sequence pairs sets extended to sixteen element space,and enriches the existence space of the spread sequences.Finally,combining the punctured binary sequences pairs and binary orthogonal matrix,the ZCZ ternary periodic complementary sequence pairs sets are obtained through specific combination method.Then the ZCZ 8QAM+ periodic complementary sequence pairs sets can be obtained by specific mappings and interleaving iteration technique.The results in this thesis spread the existence scope of multiphase complementary sequences,and can be applied in QS-CDMA system for multi-user communication.