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Polarization differential pulse position modulation method and system

A differential pulse and modulation system technology, applied in the field of wireless optical communication, can solve the problems of performance degradation, large background noise of received signals, etc., and achieve the effect of improving the signal-to-noise ratio

Inactive Publication Date: 2021-10-19
CHANGCHUN UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

[0003] In the ultraviolet LED optical communication system, the background noise of the received signal is large due to the noise light source such as sunlight; in the long-distance communication, the performance of the modulation system based on intensity modulation / direct detection drops sharply

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  • Polarization differential pulse position modulation method and system
  • Polarization differential pulse position modulation method and system
  • Polarization differential pulse position modulation method and system

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Embodiment 1

[0046] refer to figure 1 As shown, this embodiment discloses a polarization differential pulse position modulation method, which includes the following steps:

[0047] S1. Sending the source data to the encoder circuit, and subdividing the source data into an ordered sequence of n-bit binary data groups;

[0048] S2. Modulate the n-bit binary data into a signal with the following two parts: 1) start bit "1" time slot; 2) continuous "0" time slot;

[0049] S3. The modulation signal controls the light source generator to send light corresponding to the modulation signal to the circularly polarized light generator;

[0050] S4. The circularly polarized light generator outputs two kinds of orthogonal circularly polarized optical signals corresponding to the source data "0" and "1", left-handed and right-handed;

[0051] S5. After receiving the orthogonal circularly polarized light signal, the circularly polarized light inverter correspondingly generates two kinds of orthogonally...

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Abstract

The invention discloses a polarization differential pulse position modulation method and system which are applied to the technical field of wireless optical communication. The method comprises the following steps: encoding and modulating information source data; controlling a light source generator to output light through a modulation signal; obtaining 90-degree and 0-degree linearly polarized light through a circularly polarized light generator and a circularly polarized light inverter; and obtaining the information source data information through photoelectric conversion, differential amplification and decoding. According to the invention, the influence of background noise is eliminated, and the signal-to-noise ratio of the received signals is improved.

Description

technical field [0001] The present invention relates to the technical field of wireless optical communication, in particular to a polarization differential pulse position modulation method and system. Background technique [0002] Ultraviolet optical communication uses the scattering effect of atmospheric particles to transmit information, realizes non-line-of-sight scattering transmission, greatly reduces the difficulty of capturing, tracking and targeting (ATP) between communication terminals, and ensures fast and reliable communication; ultraviolet LED optical communication in Both military and civilian fields have important application value. Ultraviolet light communication systems usually use intensity modulation / direct detection schemes, such as on-off keying modulation (OOK), which has the advantage of simple implementation, but low power utilization; pulse position modulation (PPM) has the highest power utilization, but high bandwidth requirements , and requires sym...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/114H04B10/524H04B10/60
CPCH04B10/114H04B10/524H04B10/60
Inventor 詹伟达李锐唐雁峰郝子强南春岩姚广宇许鹤
Owner CHANGCHUN UNIV OF SCI & TECH