Abstract
This paper is devoted to the evaluation of the probability distribution of the multiple access interference in asynchronous Direct Sequence Code Division Multiple Access (DS CDMA) communication system based on chaotic spreading sequences. Statistical properties of such interference in a system with K users causing the multiple-access interference are obtained by a computer simulation. Simulation is carried out for the spreading sequences produced by the logistic map; the length of sequences: N = 7, 31, 63 and the number of users correspondingly: K = (3, 8, 11); (11, 32, 65); (64, 129). Ill. 3, bibl. 8, tabl. 2 (in English; abstracts in English and Lithuanian). DOI: http://dx.doi.org/10.5755/j01.eee.123.7.2380
Highlights
Chaotic binary sequences are considered to be promising for spread-spectrum communications
It is reasonable to test the correspondence of the multiple-access interference to the Gaussian random variable for CDMA systems using short spreading sequences
Bi(t) – binary information NRZ sequence (+1; -1) with the duration of BiTb where Tb – the duration of one bit, Bi ≤ (100; 400), a definite value of Bi is randomly selected from the set of (0,100) or (0,400) with an DS-CDMA system using chaotic spreading sequences
Summary
Chaotic binary sequences are considered to be promising for spread-spectrum communications. It is reasonable to test the correspondence of the multiple-access interference to the Gaussian random variable for CDMA systems using short spreading sequences. Simulation was performed for the following parametres: bi(t) – binary information NRZ sequence (+1; -1) with the duration of BiTb where Tb – the duration of one bit, Bi ≤ (100; 400), a definite value of Bi is randomly selected from the set of (0,100) or (0,400) with an DS-CDMA system using chaotic spreading sequences. Where A – a coefficient which depends on the parameters of correlation receiver elements
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