Chaotic-Laser-Based True Random Sequence Generation for Spread-Spectrum Communications

• 作 者: 张朝霞 周俊杰 张东泽 傅正 张建忠
• 机 构: College of Physics and Optoelectronics,Taiyuan University of Technology,State Key Laboratory of Mill
• 出 处: 中国激光
• 发表日期: 2012年10期
• 关键词: spread chaotic periodicity enlarge eliminate users inherent smoothly Spectrum co

We propose a scheme for spread-spectrum communications using true random sequences generated by chaotic semiconductor lasers as spreading codes.These sequences can eliminate the inherent periodicity of pseudorandom sequences,enlarge the capacity of spread-spectrum codes,improve communication security,and increase the number of users of the system.When a true random sequence with an appropriate length is used as the spread-spectrum code and the information speed is maintained constant,the system acquires a greater spreadspectrum gain and a lower bit-error ratio(BER) than the traditional spread-spectrum system.The communication security is also enhanced.The BER smoothly increases with the number of users,which indicates the good multipleaccess capability of the system.

We propose a scheme for spread-spectrum communications using true random sequences generated by chaotic semiconductor lasers as spreading codes. These sequences can eliminate the inherent periodicity of pseudorandom sequences, enlarge the capacity of spread-spectrum codes, improve communication security, and increase the number of users of the system. When a true random sequence with an appropriate length is used as the spread-spectrum code and the information speed is maintained, the system acquires a greater spread spectrum gain and a lower bit-error ratio (BER) than the traditional spread-spectrum system. The communication security is also enhanced. BER smooth increases with the number of users, which shows the good multipleaccess capability of the system.