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Method and apparatus for decreasing peak-to-average power ratio of three-dimensional coherent optical orthogonal frequency division multiplexing system

A peak-to-average power ratio and orthogonal frequency division technology, which is applied in the field of optical communication, can solve the problems of being confined to two-dimensional signal space, system performance degradation, and high peak-to-average power ratio, and achieves improved frequency band utilization, low complexity, The effect of reducing the peak-to-average power ratio

Active Publication Date: 2017-06-13
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

However, there is a problem of high peak-to-average power ratio when OFDM technology is used, which makes OFDM signals susceptible to interference from optical fiber nonlinear effects, resulting in system performance degradation
[0003] At present, OFDM technology based on constant envelope and OFDM technology based on coding are usually used to improve the peak-to-average power ratio of coherent optical OFDM systems, but the above The constellation diagrams used in the method for signal mapping are limited to two-dimensional signal space, which limits the improvement of system performance

Method used

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  • Method and apparatus for decreasing peak-to-average power ratio of three-dimensional coherent optical orthogonal frequency division multiplexing system
  • Method and apparatus for decreasing peak-to-average power ratio of three-dimensional coherent optical orthogonal frequency division multiplexing system
  • Method and apparatus for decreasing peak-to-average power ratio of three-dimensional coherent optical orthogonal frequency division multiplexing system

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Experimental program
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Embodiment

[0072] Example parameters:

[0073] Set the number of subcarriers of the OFDM signal to be 64, adopt the additive white Gaussian noise (AWGN) channel to verify the impact of the present invention on system performance, the three-dimensional signal constellation diagram adopts an octal regular hexahedron structure, and set The average power of the three-dimensional signal constellation is 1, the length of the K sequence to be searched is L, and the postselection level of each component in the K sequence is {-1,1} or {-3,-1,1,3}.

[0074] The verification results are as follows:

[0075] image 3 Among them, L=N, in CCDF (complementary cumulative distribution function)=10 -4 , When the number of post-selection levels C=2 and μ=0.5774, the peak-average power is improved by about 3.5dB compared with the original system, and the average power of the transmitted signal is increased by 9.63%. When μ=2, the peak-to-average power ratio performance can be improved by 1.8dB, and the a...

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Abstract

The invention discloses a method and apparatus for decreasing a peak-to-average power ratio of a three-dimensional coherent optical orthogonal frequency division multiplexing system. The method comprises the following steps: (1) converting a binary sequence to obtain a subcarrier index signal; (2) mapping to obtain a frequency-domain orthogonal frequency division multiplexing signal of 3N real-form subcarrier components; (3) recombining to obtain a frequency-domain orthogonal frequency division multiplexing signal of 2N plural-form subcarrier components; (4) modulating the orthogonal frequency division multiplexing signal from the frequency domain to a time domain; (5) introducing a K sequence from the frequency domain, performing zero padding, and superimposing with the time-frequency orthogonal frequency division multiplexing signal after the modulation; (6) searching a K sequence combination with a minimum signal peak-to-average power ratio; (7) dividing the time-domain orthogonal frequency division multiplexing signal into a real-number portion and an imaginary-number portion corresponding to the real-number portion, and converting to an optical signal; and (8) transmitting the optical signal. By adopting the method and the apparatus, the peak-to-average power ratio is effectively decreased, the influence of a nonlinear action of an optical-fiber channel on the signal can be alleviated, and the overall performance can be improved.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a method and a device for reducing the peak-to-average power ratio (PAPR) of a three-dimensional coherent optical orthogonal frequency division multiplexing (OFDM) system. Background technique [0002] In the field of optical communication, coherent optical orthogonal frequency division multiplexing technology has been widely used in long-distance optical fiber transmission systems. It has the advantages of large capacity, high spectrum utilization, and effective anti-dispersion. However, there is a problem that the peak-to-average power ratio is too high when the OFDM technology is used, which makes the OFDM signal susceptible to interference from the nonlinear effect of optical fiber, resulting in a decrease in system performance. [0003] At present, OFDM technology based on constant envelope and OFDM technology based on coding are usually used to improve the peak-to-avera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/00H04B10/516H04L27/26
CPCH04B1/0007H04B10/516H04L27/2614H04L27/2628Y02D30/70
Inventor 陈振兴刘嘉珩黄田野罗林波李哲丰
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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