Title :
Performance evaluation of asynchronous DS/CDMA communications using unipolar codes
Author :
Tsuneda, Akio ; Yoshida, Takashi
Author_Institution :
Dept. of Comput. Sci. & Electr. Eng., Kumamoto Univ., Kumamoto, Japan
Abstract :
In CDMA communications with radio waves, binary spreading sequences are used as bipolar codes taking +1 or -1. On the other hand, in on-off keying modulation such as optical communications, spreading sequences are used as unipolar codes taking 1 or 0. In this paper, performances of asynchronous SIK (sequence inversion keyed) DS/CDMA systems using unipolar codes are evaluated and compared with normal CDMA systems using bipolar codes.
Keywords :
amplitude shift keying; binary sequences; code division multiple access; optical communication; radiowaves; spread spectrum communication; asynchronous DS/CDMA communications; binary spreading sequences; bipolar codes; on-off keying modulation; optical communications; radio waves; sequence inversion keyed; unipolar codes; Bit error rate; Chaos; Correlation; Generators; Gold; Multiaccess communication; Nonlinear optics;
Conference_Titel :
Circuit Theory and Design (ECCTD), 2011 20th European Conference on
Conference_Location :
Linkoping
Print_ISBN :
978-1-4577-0617-2
Electronic_ISBN :
978-1-4577-0616-5
DOI :
10.1109/ECCTD.2011.6043626
