An Encryption Method for Broadband Access Network
A technology of broadband access network and encryption method, applied in the encryption field of broadband access network, can solve the problems of complexity, increase the cost of OFDM system, destroy the robustness of optical fiber dispersion, etc., and achieve low system overhead, simple structure, and hardware cost. low effect
Active Publication Date: 2016-12-28
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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However, since the laser is chaotically scrambled in this scheme, which destroys the orthogonality of OFDM signal subcarriers, and then destroys the robustness of optical OFDM signal to fiber dispersion, it is not suitable for long-distance OFDM-PON systems.
At the same time, this scheme also has the difficulty of chaotic synchronization
For the encryption scheme using interleaving, since the OFDM signal needs to be interleaved and encrypted at the receiving end, and deinterleaved and decrypted at the receiving end, the entire system needs complex interleaving and deinterleaving circuits, which increases the cost of the OFDM system
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[0030] For the convenience of description, the relevant technical terms appearing in the specific implementation are explained first:
[0031] OFDM (Orthogonal Frequency Division Multiplexing): Orthogonal Frequency Division Multiplexing;
[0032]FFT (Fast Fourier Transform): Fast Fourier Transform;
[0033] IFFT (Inverse Fast Fourier Transform): fast inverse Fourier transform;
[0034] PD (Photodiode): Photodiode;
[0035] OF(Optical Filter): optical filter;
[0036] EDFA (Erbium-doped Optical Fiber Amplifier): Erbium-doped optical fiber amplifier;
[0037] TBPF (Tunable Band Pass Filter): adjustable band pass filter;
[0038] PC (Polarization Controller): polarization controller;
[0039] AM (Amplitude Modulation): amplitude modulation;
[0040] MZM (Mach Zehnder Modulator): Mach Zehnder modulator;
[0041] PRBS (Pseudo Random Binary Sequence): Pseudo-random bit sequence;
[0042] OLT (Optical Line Terminal): optical line terminal;
[0043] ONU (Optical Network Unit)...
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The invention discloses an encryption method of a broadband access network. A sending end randomly selects a plurality of subcarriers among all OFDM subcarriers for noise modulation, and other subcarriers are used for useful data modulation, thereby realizing noise scrambling. Only when the receiver knows the noise-loaded subcarrier distribution scheme, it does not need to decrypt during the OFDM demodulation process, and directly discards the subcarrier data loaded by the noise signal, so as to quickly realize OFDM noise descrambling and obtain useful data signals. Using the OFDM broadband access network of the present invention, the encryption circuit at the sending end has a simple structure, and the receiving end does not need to perform decryption synchronization or even decryption circuits, which reduces the complexity of the entire OFDM encryption system and realizes OFDM communication with low cost and high confidentiality .
Description
technical field [0001] The invention belongs to the technical field of optical communication, and more specifically relates to an encryption method for a broadband access network. Background technique [0002] At present, with the advent of bandwidth digital applications and the maturity of VLSI (Very Large Scale Integrated Circuit, VLSI) CMOS (Complementary Metal Oxide Semiconductor, Complementary Metal Oxide Semiconductor) chips in the 1990s, OFDM modulation technology is widely used in Europe Digital video broadcasting, wireless local area network (Wireless Fidelity, Wi-Fi, IEEE802.11a / g / n), wireless metropolitan area network (Word Interoperability For Microwave Access, WiMAX, 802.16e), asymmetrical digital subscriber line (Asymmetrical Digital Subscriber Loop , ADSL, ITU G.992.1) and the fourth-generation mobile communication technology that has long been concerned by people. However, compared with the application of OFDM in the field of radio frequency, its application...
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IPC IPC(8): H04L9/00H04L27/26
Inventor 张崇富靳唯邱昆武保剑
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA