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Time frequency dynamically changing multi-frequency and multi-probability optical millimeter wave generation method

A technology of dynamic change and generation method, which is applied in the direction of optical fiber transmission, optical fiber radio, electromagnetic wave transmission system, etc., can solve the problem that the system is not flexible enough to generate dynamically changing electrical millimeter waves, cannot well meet the needs of different bandwidths, and cannot be dynamic in time and frequency Changes and other issues, to achieve the effect of frequency stability, excellent anti-noise performance, and good spectral efficiency

Active Publication Date: 2019-01-01
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

[0003] One of the core technologies of RoF is optically-generated millimeter-wave technology. Traditional optically-generated millimeter-wave technologies include modulators for sideband modulation, cyclic frequency shifters to generate multi-carriers, and pulsed light and photonic crystal fibers for parametric processes. However, these The technology has a common disadvantage, that is, the multi-carriers generated are fixed and cannot change dynamically with time and frequency, which makes the system not flexible enough to generate dynamically changing electrical millimeter waves.
This makes it impossible to meet the different needs of different users for bandwidth.

Method used

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  • Time frequency dynamically changing multi-frequency and multi-probability optical millimeter wave generation method
  • Time frequency dynamically changing multi-frequency and multi-probability optical millimeter wave generation method
  • Time frequency dynamically changing multi-frequency and multi-probability optical millimeter wave generation method

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Embodiment Construction

[0025] The present invention will be further described in detail through the following examples in conjunction with the accompanying drawings. The following examples are explanations of the present invention and the present invention is not limited to the following examples.

[0026] In traditional constellation mapping, each symbol point represented by the same number of bits in the constellation diagram is transmitted with the same probability. Since the constellation points at different positions have different Euclidean distances, the energy required to transmit them is also the same. Different, the closer to the inner circle the smaller the energy required. If the mapping probabilities of different positions are optimized, the inner circle points with lower emission energy can be mapped with a higher probability, while the outer circle points with higher emission energy are mapped with a lower probability, which can effectively reduce the overall The transmit power of the...

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Abstract

The invention discloses a time frequency dynamically changing multi-frequency and multi-probability optical millimeter wave generation method comprising the following steps: an optical millimeter wavegeneration system is prepared; optical multi-carriers are generated, a crystal oscillator is used as a clock source, and the adjustable local oscillator signal is outputted through radio frequency tobe modulated with the pulse optical signal emitted by a pulse light source in a cyclic frequency shifter; the optical multi-carriers are grouped; and different probability mapping is performed on thegrouped optical multi-carriers. The better spectral efficiency and the better anti-noise performance under the condition of constant emission power can be obtained.

Description

technical field [0001] The invention relates to a method for generating an optical-carried millimeter wave, in particular to a method for generating a multi-frequency and multi-probability optical-carried millimeter wave with dynamic changes in time and frequency. Background technique [0002] In recent years, with the rapid development of the network, people's demand for network bandwidth is increasing day by day. The communication network needs larger bandwidth and better spectrum efficiency, so the demand for multi-rate and multi-carrier frequency is increasing. Broadband and wireless are the research hotspots of communication nowadays. With the increasing maturity of optical fiber research and manufacturing technology, optical fiber communication, which has the advantages of large communication capacity, long transmission distance and low loss, stands out, gradually matures and has been widely used. At the same time, the flexibility and mobility of wireless communicatio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/2575
CPCH04B10/25752
Inventor 刘博张丽佳毛雅亚赵建业忻向军孙婷婷赵立龙吴泳锋刘少鹏宋真真王俊锋哈特姜蕾
Owner NANJING UNIV OF INFORMATION SCI & TECH
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