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It discussed about timing synchronization algorithm for OFDM system and performance. Taking the advantage of one way couple map lattices (OCML) model generated chaos sequences. Building a simulation model of OFDM system based on OCML-Masking symbol timing synchronization algorithm. Training sequence with symmetric construction was masked by OCML chaotic sequence. Recovering training sequence at receiver...
Some chaotic sequences have poor autocorrelation performance or modulated autocorrelation performance, but previously we didn't know the rule and couldn't improve their performances effectively. Using recently presented Autocorrelation and modulated Autocorrelation theorems based on a Phase Space method, we can find and mend the structure defects of chaotic sequences and improve their autocorrelation...
Hyperchaos sequences have been widely used as a kind of complex pseudorandom sequences. But some well known Hyperchaos sequences, such as CML sequence, have poor autocorrelation performance, and their applications are limited. Based on recently presented APAS theorem, we modified CML map to S-CML map, and S-CML sequence has excellent autocorrelation performance, whereas its other performances are...
Chaotic sequences have been widely used as pseudorandom sequences. Although some well known chaotic sequences have good autocorrelation performance, but after modulation, autocorrelation performance become poor, such as Tent sequence, so their applications are limited. Based on recently presented APAS theorem, we modified Tent map to DS-Tent map, and DS-Tent sequence has excellent RFM autocorrelation...
Chaotic sequences, as a kind of pseudorandom sequences, have been widely used. But some well known chaotic sequences, such as Henon sequence, have poor autocorrelation performance, and their applications are limited. Based on recently presented APAS theorem, we modified Henon map to S-Henon map, and S-Henon sequence has excellent autocorrelation performance and simple structure, whereas its other...
Chaotic sequences have been widely used as pseudorandom sequences. But some well known chaotic sequence has poor autocorrelation, or after modulation, autocorrelation performance become poor, and their applications are limited. Such as TD-ERCS sequence, not only has poor autocorrelation performance, but also its RFM signal has poor autocorrelation, too. Based on recently presented APAS theorem, we...
Chaotic sequences, as a kind of pseudorandom sequences, have been widely used. But some well known chaotic sequences, such as Skew Tent sequence, have poor autocorrelation performance, and their applications are limited. Based on recently presented APAS theorem, we modified Skew Tent map to S-Skew Tent map, and S-Skew Tent sequence has excellent autocorrelation performance and simple structure, whereas...
In blind source separation, it is generally assumed that the sources have unit variance. However, the variances of the sources may be different in practice. The results of using the fast independent component analysis (FastICA) algorithm to realize blind extraction of chaotic signals with different variances are reported in this paper. The correlation coefficient and intersymbol interference (ISI)...
A chaotic synchronized secure communication method based on time-varying parameter is presented. The method improves security performance of communication greatly, and can defeat all kinds of attacking methods at present. The parameter sensitivity of chaotic synchronization makes chaotic synchronization robust, but eavesdroppers can follow this way to attack and defeat communication system. Time-varying...
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