Symbol alignment in high speed optical orthogonal frequency division multiplexing transmission systems

A technology of orthogonal frequency division and symbol synchronization, applied in optical multiplexing system, multi-frequency code system, multiplexing communication, etc., can solve problems that are not suitable for high-speed OOFDM transmission system
CN103621031AInactive Publication Date: 2014-03-05UNIV OF WALES BANGOR
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF WALES BANGOR
Publication Date
2014-03-05
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The present invention discloses a method for symbol synchronisation in high speed optical orthogonal frequency division multiplexing (OOFDM) transmission systems via coding the electrical OFDM symbols by adding an independent low power-level alignment signal, converting the encoded signal into the optical domain for transmission, and in the receiver converting the received optical signal to the electrical domain and digitally processing to detect the symbol alignment offset by utilising the independent low-power level alignment signal. The present invention is suitable for point-to-point and point-to-multipoint OOFDM networks and has the additional features of timeslot and frame alignment, compensation for receiver sampling clock offset and providing physical layer network security.
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Description

technical field

[0001] The invention discloses an algorithm based on digital signal processing (DSP), which uses symbol DC offset signaling (offset signaling) to align symbols and introduce them into a high-speed optical orthogonal frequency division multiplexing (OOFDM) transmission system. Additional physical layer network security techniques. Background technique

[0002] The use of optical orthogonal frequency division multiplexing (OOFDM) modulation techniques to reduce optical modal dispersion in multimode fiber (MMF) transmission links is known, e.g. by Jolley et al. (N.E. Jolley, H. Kee, R. Richard, Proposed by J. Tang and K. Cordina, National Fiber Optical Fiber Engineers Conf., Annaheim, CA, March 11, 2005, document OFP3). It also provides great resistance to dispersion impairment, efficient use of channel spectral characteristics, excellent cost-effectiveness due to full use of mature digital signal processing (DSP), provides mixed dynamics in frequency domain an...

Claims

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