원문정보
초록
영어
A new CDMA system which uses fractional chip shift expanded generalized complementary orthogonal code groups as spectrum spreading code sequences and offer high spectral efficiency is introduced in the paper. This new CDMA system is totally different with conventional CDMA system in access codes designing and spectrum spreading process. In this CDMA system, the access codes of different cells keep orthogonality, which eliminates inter cells interferences (ACI) by aperiodic cross-correlation function (CCF). The spreading process of new CDMA system introduces inter symbols interference like overlap time division multiplexing (OVTDM) deliberately so as to improve spectral efficiency. The construction of expanded generalized complementary orthogonal code groups, shift method, principle of new CDMA system are explained respectively. Analysis and simulation results verify the validity of this new CDMA system.
목차
1. Introduction
2. Introduction of Expanded Generalized Complementary Orthogonal Code Groups
2.1. Perfect Complete Complementary Orthogonal Code Pairs Mate
2.2. Perfect Complete Generalized Complementary Orthogonal Codes
2.3. Expanding Theorem 1 and Perfect Complete Generalized Complementary Orthogonal Code Groups
2.4. Expanding Theorem 2 and Expanded Generalized Complementary Orthogonal Code Groups
2.5. Examples and Validating Properties of Expanded Generalized Complementary Orthogonal Code Groups
3. New CDMA System Model and Relationship between New CDMA System and OVTDM
3.1. New CDMA System Model
3.2. Introduction of OVTDM and Relationship between New CDMA System and OVTDM
4. Simulation and Analysis
5. Conclusion
References