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On Carrier Spacing of MC-DS-CDMA Systems Employing Chaotic Spreading Sequences
Yusuke Furukawa,Daisaburo Yoshioka 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
This paper studied the effect of carrier spacing between two adjacent carriers on the performance of multicarrier direct sequence code division multiple access (MCDS-CDMA) employing chaos-based spreading sequences. The optimum auto-correlation values of chaotic spreading sequences in terms of average multiple access interference (MAI) in MC-DS-CDMA systems are estimated.
A Generation Method of Maximal-Period Sequences Obtained by Discretized r-adic Maps
Yuya Yamaryo,Daisaburo Yoshioka 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
An algorithm of generation of maximal-period chaotic sequences obtained from the one-to-one quantized (discretized) r-adic maps on finite phase space is proposed. This algorithm is drived based on the relationship between such discretized maps and graph theory. The long period sequences can be achieved from shorter period sequences by using the proposed algorithm recursively.
An Algorithm for the Construction of Maximal-Period Sequences Obtained by Discretized Chaos Maps
Atsunori Katayama,Daisaburo Yoshioka 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In this paper, a construction method for generation of maximal-period sequences obtained from discretized chaos map is theoretically shown, where the relationship between discretized maps and transpositions plays a crucial role. A simple and efficient algorithm for generation of maximal-period sequences is also proposed in this paper.