Pulse and OFDMD double-data modulation method

A dual modulation, pulse modulation technology, applied in the field of communication, can solve the problem of inability to use independently
CN101710890AInactive Publication Date: 2010-05-19EAST CHINA UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
EAST CHINA UNIV OF SCI & TECH
Publication Date
2010-05-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a double-data modulation method of pulse and OFDM. An optical spectrum of a single chip white light LED is formed by exciting fluorescent powder of yellow color or red-green color and the like by a blue light, and the shape of the whole optical spectrum has two relative independent peak values, wherein the responding speed of the blue light is higher than that of a warm color light. The invention can be used for transmitting data by pulse modulation of the blue light and can be used as a carrier wave for the warm color light OFDM modulation, thus a double channel high-speed data transmission is realized. In addition, the blue light can be used as a reference simultaneously for OFDM symbol synchronization, direct current offset estimation and channel estimation.
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Description

technical field

[0001] The invention belongs to the technical field of communication, and specifically relates to a device and method for dual data modulation and demodulation of pulse and OFDM when using lighting LEDs to realize short-distance communication. Background technique

[0002] Visible light communication based on lighting LED is an emerging short-range wireless communication method, which is expected to replace or supplement the current short-range RF wireless communication technology to improve communication speed, reduce cost and environmental electromagnetic radiation. At present, the feasibility of using LED communication for lighting in different environments has been initially confirmed, including applications in indoor and intelligent transportation.

[0003] One of the important technical aspects of communication is the modulation of the communication data signal. According to different communication systems and application requirements, broadly speaking...

Claims

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