Robust timing and frequency joint synchronization method for QNSC-enabled security optical communications system based on CO-OFDM

被引:1
作者
Guo, Hong [1 ]
Zhang, Jie [1 ]
Yang, Xiaokun [2 ]
Zhang, Huibin [1 ]
机构
[1] Beijing Univ Posts & Telecommun, State Key Lab Informat Photon & Opt Commun, Beijing 100876, Peoples R China
[2] Shanghai Inst Microsyst & Informat Technol, Shanghai 200050, Peoples R China
基金
中国国家自然科学基金;
关键词
Timing synchronization; Frequency synchronization; QNSC; Security optical communication; Detection failure probability;
D O I
10.1016/j.yofte.2022.103144
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The security of optical fiber communication network has been paid more and more attention, and Quantum Noise Stream Cipher (QNSC) can guarantee its physical layer security. However, the QNSC system realized with CO-OFDM technology is very susceptible to timing synchronization error and carrier frequency offset. Existing symbol timing and frequency synchronization algorithms based on preambles have problems of timing metric platform, interference of side lobes, and low timing and frequency synchronization accuracy especially in optical signal transmission scenario of high-order modulation and low SNR. Furthermore, the preamble is not encrypted, which can be easily identified by illegal receiver. In order to solve above problems, a robust timing and frequency joint synchronization algorithm is proposed. The algorithm is composed of the preamble interleaved by conjugate, negative and image sequences of original element sequence. The preamble conforms to the preamble structure of Schmidl, Minn and CNI by adding negative and conjugate operator at the specific interval of the preamble. The correspond timing metric method, i.e. combination of Schmidl, Minn and CNI timing metric strategies, can fully extract characteristics of the preamble, and then timing and frequency joint synchronization is accurately obtained. For timing synchronization, experiments in 10Gbit/s CO-OFDM based QNSC system have illustrated that proposed algorithm has better timing synchronization performance than baseline algorithms. The detection probability is augmented and timing offset mean is decreased than that of baseline algorithms especially at low SNR. The simulation illustrates that proposed algorithm has more accurate frequency offset (FO) estimation performance compared with the baseline algorithms even at low SNR. Furthermore, the simulation illustrates the security performance of CO-OFDM based QNSC system is improved by encrypting the preamble with secret key.
引用
收藏
页数:11
相关论文
共 19 条
[1]   Robust Timing and Frequency Synchronization for OFDM Systems [J].
Abdzadeh-Ziabari, Hamed ;
Shayesteh, Mahrokh G. .
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, 2011, 60 (08) :3646-3656
[2]  
Chu D. C., 1972, IEEE Transactions on Information Theory, VIT-18, P531, DOI 10.1109/TIT.1972.1054840
[3]   Efficient joint timing and frequency synchronization algorithm for coherent optical OFDM systems [J].
Du, Xinwei ;
Zhang, Jing ;
Li, Yan ;
Yu, Changyuan ;
Kam, Pooi-Yuen .
OPTICS EXPRESS, 2016, 24 (17) :19969-19977
[4]   Low-Complexity Sequential Searcher for Robust Symbol Synchronization in OFDM Systems [J].
Hsu, Terng-Yin ;
Cheng, Shau-Yu .
IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, 2012, 20 (05) :959-963
[5]   Security Evaluation of Y00 Protocol Based on Time-Translational Symmetry Under Quantum Collective Known-Plaintext Attacks [J].
Iwakoshi, Takehisa .
IEEE ACCESS, 2021, 9 :31608-31617
[6]  
Li L., 2018, MILITARY COMMUNICATI, P1
[7]  
Minn H, 2000, 2000 IEEE 51ST VEHICULAR TECHNOLOGY CONFERENCE, PROCEEDINGS, VOLS 1-3, P51, DOI 10.1109/VETECS.2000.851416
[8]  
Parekha CD, 2016, 2016 INTERNATIONAL CONFERENCE ON ADVANCES IN COMPUTING, COMMUNICATION AND AUTOMATION (ICACCA 2016), P64
[9]   A novel timing estimation method for OFDM systems [J].
Park, B ;
Cheon, H ;
Kang, C ;
Hong, D .
IEEE COMMUNICATIONS LETTERS, 2003, 7 (05) :239-241
[10]   Synchronization method based on a new constant envelop preamble for OFDM systems [J].
Ren, GL ;
Chang, YL ;
Zhang, H ;
Zhang, HN .
IEEE TRANSACTIONS ON BROADCASTING, 2005, 51 (01) :139-143