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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

Inactive Publication Date: 2014-03-05
UNIV OF WALES BANGOR
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Problems solved by technology

However, none of these methods are suitable for high-speed OOFDM transmission systems with very high bit rates 1000 times higher than non-optical OFDM

Method used

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

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Embodiment Construction

[0047] Therefore, the present invention discloses a method for symbol synchronization in a high-speed OOFDM transmission system, said method comprising encoding electrical OFDM symbols by adding an independent low-power level alignment signal and using electro-optical (E / O) The converter converts the combined signal into the optical domain.

[0048] This method is fully described in Figure 1a and 1b middle.

[0049] Figure 1a A system block diagram showing the OOFDM downlink in an optical network. Digital hardware 1-9 in the transmitter generates a sampled digital OFDM signal from the binary payload data input from the medium access control (MAC) layer. The serial-to-parallel conversion functional block 1 converts the serial (multiple) input data streams into parallel output data, and inserts predefined pilot data (pilot data) 2 for channel estimation. Encoder 3 maps the incoming parallel binary data to multiple complex-valued subcarriers using various modulation formats...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2601H04J14/00H04L27/2663H04L27/2697H04B10/00H04L27/2602H04L27/2662H04L27/26
Inventor R.吉丁斯唐建明
Owner UNIV OF WALES BANGOR
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