Title :
Chaotic complex spreading sequences for asynchronous DS-CDMA. I. System modeling and results
Author :
Mazzini, Gianluca ; Setti, Gianluca ; Rovatti, Riccardo
Author_Institution :
Dept. of Eng., Ferrara Univ., Italy
fDate :
10/1/1997 12:00:00 AM
Abstract :
This paper and its companion are devoted to the evaluation of the impact of chaos-based techniques on communications systems with asynchronous code division multiple access. Sequences obtained by repeating a truncated and quantized chaotic time series are compared with classical m-sequences and Gold sequences by means of a performance index taken from communication theory which is here defined and thoroughly discussed. This analysis reveals that, unlike conventional sequences, chaotic spreading codes can be generated for any number of users and allocated bandwidth. Numerical simulations are reported, showing that systems based on chaotic spreading sequences perform generally better than the conventional ones. Some analytical tools easing the comprehension of these advantages are summarized
Keywords :
chaos; code division multiple access; personal communication networks; sequences; spread spectrum communication; time series; Gold sequences; asynchronous DS-CDMA; chaotic complex spreading sequences; classical m-sequences; performance index; quantized chaotic time series; Bandwidth; Chaos; Chaotic communication; Communication systems; Frequency synchronization; Modeling; Multiaccess communication; Radio spectrum management; Radiofrequency integrated circuits; Spread spectrum communication;
Journal_Title :
Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on
