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Differential multi-pulse position modulation method

A modulation method and multi-pulse technology, applied in the field of laser communication, can solve the problems of high system complexity and low bandwidth utilization, and achieve the effects of reducing complexity, increasing bandwidth requirements, and reducing length

Pending Publication Date: 2018-02-09
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology

[0005] An embodiment of the present invention provides a differential multi-pulse position modulation method to solve the problems of low bandwidth utilization and high system complexity in the prior art

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Embodiment Construction

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0021] Since OOK uses the presence or absence of pulses to represent binary information, this modulation method is the simplest, but the energy utilization rate is low; PPM modulation uses the position of the pulse to represent information, which relatively improves the energy utilization rate but largely sacrifices Bandwidth utilization; PPM modulation contains multiple pulse signals within an information frame period, and is used to represent an N-bit binary ...

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Abstract

The invention discloses a differential multi-pulse position modulation method, and relates to the technical field of the laser communication. The method comprises the following steps: S1, receiving data into a coder circuit, and subdividing the data into an ordered sequence of groups of N binary data; S2, modulating each group of N binary data to an information frame, wherein the information framecontains m time slots, and the m time slots comprise p optical pulses, S3, completely deleting all empty time slots after the last optical pulse in the information frame; S4, taking the next time slot after the last optical pulse as an initial bit of the next information frame; and S5, sending the data according to the modulated signal sequence. A symbol structure can be simplified by the DMPPM modulation on the basis of the MPPM modulation, thereby further improving the bandwidth availability ratio of the system. Since a differential formula is adopted in the DMPPM modulation scheme, the frame synchronization process is omitted, and the complexity of the system can be effectively reduced.

Description

technical field [0001] The present invention relates to the technical field of laser communication, and in particular to a differential multi-pulse position modulation method. Background technique [0002] Free space optical communication has the advantages of no need to apply for spectrum, security and confidentiality, large information capacity, small device size, and low power consumption. It has become a popular communication method at present. [0003] At present, the modulation methods of free space optical communication mainly include on-off keying (OOK), pulse position modulation (PPM) and multi-pulse position modulation (MPPM). The OOK method is simple to implement, with high transmission capacity but low power utilization, and poor anti-interference ability; PPM uses the position of the pulse to represent information, which improves the energy utilization rate compared with OOK, but largely sacrifices the bandwidth utilization rate; People invented the MPPM modula...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/524H04B14/02H04B10/11
CPCH04B10/11H04B10/524H04B14/026
Inventor 郝子强詹伟达
Owner CHANGCHUN UNIV OF SCI & TECH
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