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The Study of Codes in the OCDMA Communication System

Author: HanXiao
Tutor: ZhangXingZhou
School: Harbin Engineering University
Course: Optical Engineering
Keywords: OCDMA Correlation Light- address code Phototropin digital
CLC: TN929.533
Type: Master's thesis
Year: 2010
Downloads: 57
Quote: 1
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Abstract


Optical code division multiple access technology is a code division multiple access technology of the electric field applied to the optical fiber communication in a communication technology, take full advantage of the huge bandwidth of fiber resources and combines the advantages of the code division multiple access communication system transmission The rate is improved, is one of the focus of the current optical fiber communication. Design and Research of optical address code is one of the key technologies of optical code division multiple studies. Optical code division multiple access system users to use different mutually orthogonal or quasi-orthogonal optical address code word to distinguish one by one, to be achieved by the correlation operation at the receiving end. The optical address code features excellent decision whether or not excellent performance of optical code division multiple access communication system, but it also determines the complexity of the system codec. Therefore, the address code of light as the main research contents of the following discussion. First, the basic principles of the OCDMA communication system, key technologies and development at home and abroad to do a more detailed introduction to the field of optical fiber communication multiplexing compared and summarized. Secondly, a more in-depth study of one-dimensional optical address code and two-dimensional optical address code algorithm for constructing one-dimensional optical address code and two-dimensional optical address code word, and the relative performance of various codeword and the system bit error rate, signal-to-interference ratio in-depth mathematical analysis and comparison the application Matlab7.0 software to verify the results of the analysis, the results showed that each codeword in performance and the system bit error rate, The signal-to-interference ratio is different, the performance of the two-dimensional optical address code codeword capacity or improve the system performance has greatly improved compared with the one-dimensional optical address code. Finally, the angle of departure from the optical address code, OCDMA communication system of one of the key technologies - multi-user interference problems, the address code, and the spectral amplitude OCDMA communication system according to the performance of the spectral amplitude of the address code structures, application of optical communication simulation the software Optisystem7.0 on the functional simulation results indicate that the address code based on the spectral amplitude OCDMA communication system can effectively inhibit the multi-user interference; mixed OCDMA WDM communication system address code constructor theoretical proof, OCDMA WDM hybrid communication system can be the two technologies together, learn from each other, the system performance is also improved.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Mobile Communications > Cellular mobile communications systems (mobile phones, mobile phone handsets ) > Code Division Multiple Access (CDMA) mobile communication
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