Code extraction from encoded signal in time-spreading optical code division multiple access

被引：19

作者：

Si, Zhijian ^{[1
]}

Yin, Feifei ^{[1
]}

Xin, Ming ^{[1
]}

Chen, Hongwei ^{[1
]}

Chen, Minghua ^{[1
]}

Xie, Shizhong ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Elect Engn, TNList, State Key Lab Integrated Optoelect, Beijing 100084, Peoples R China

来源：

OPTICS LETTERS | 2010年 / 35卷 / 02期

基金：

中国国家自然科学基金;

关键词：

O-CDMA; PERFORMANCE;

D O I：

10.1364/OL.35.000229

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A vulnerability that allows eavesdroppers to extract the code from the waveform of the noiselike encoded signal of an isolated user in a standard time-spreading optical code division multiple access communication system using bipolar phase code is experimentally demonstrated. The principle is based on fine structure in the encoded signal. Each dip in the waveform corresponds to a transition of the bipolar code. Eavesdroppers can get the code by analyzing the chip numbers between any two transitions; then a decoder identical to the legal user's can be fabricated, and they can get the properly decoded signal. (C) 2010 Optical Society of America

引用

页码：229 / 231

页数：3

共 8 条

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