Research On Design Of Zero Correlation Zone Codes For Wireless Communication System

For the future high-rate and high-spectral efficiency quasi-synchronous CDMA communication systems,in the sequence design,the sequence is the best when the parameters of sequences arrive at Welch lower bound.Zero-correlation zone sequence sets have ideal autocorrelation and cross-correlation characteristics in the correlation zone and are therefore widely used in quasi-synchronous code division multiple access communication systems to eliminate interference.In multi-carrier quasi-synchronous CDMA system,the parameters of the complementary sequence set have a great influence on the communication systems.The set of sequences with flexible parameters can be adapted to different applications.In order to meet the performance requirements of wireless communication systems,this paper mainly studies the design of address codes with zero correlation zone.First of all,based on the orthogonal matrix and finite field,the constructions of zero-correlation zone aperiodic complementary sequence sets with the optimal parameters or flexible parameters are proposed to solve the problem of limited number of users in the complementary-code-based multi-carrier CDMA systems.The zero-correlation zone aperiodic complementary sequence set(ZACS)arrives at the theoretical bound,and the parameters of the constructed sequence set are more flexible,which provides more choices for the application of ZACS set in multi-carrier CDMA system.Secondly,QAM sequence is widely used to eliminate the inter-symbol interference and reduce Peak-to-Average Power Ratio(PAPR)of OFDM communication systems.In this paper,two kinds of constructions of QAM ZCZ sequence sets are proposed.Based on ternary periodic complementary sequence sets,the constructions of zero-correlation zone periodic complementary sequence sets over 8-QAM+ constellation are proposed by using shift mapping,parameters of ZCZ sequence sets presented are optimal with respect to the theoretical bound.Finally,by using mapping method and filtering method,zero-correlation zone Gaussian integer sequence sets and zero-correlation zone Gaussian integer sequence complementary sets are constructed based on orthogonal matrix and complete Gaussianinteger sequence sets.Different from the existing constructions,parameters of the sequence sets arrive at the Tang-Fan-Matsufuji bound.