Visible light communication modulation method based on carrier index modulation and implementation system thereof

A carrier index modulation and visible light communication technology, applied in the field of visible light communication, can solve the problems of reducing the bit error rate and high system complexity of the visible light communication system
CN108512801AInactive Publication Date: 2018-09-07SHANDONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHANDONG UNIV
Publication Date
2018-09-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a visible light communication modulation method based on carrier index modulation and an implementation system thereof. The information bits to be transmitted are divided intotwo parts of index bits and constellation bits; the constellation bits are input into a unipolar M-order PAM constellation diagram to obtain a modulated constellation symbol; and then, every two constellation symbols form a complex signal. The index bits are used for selecting which sub-carriers to transmit the complex signal and which sub-carriers to transmit the conjugate signal of the complexsignal. After being subjected to discrete fourier inverse transform and direct-current offset, the complex signal modulated by the carrier index modulation can be converted into a unipolarity real signal. At a receiving end, the complex signal, obtained after the direct-current offset and the discrete fourier transform are removed, recovers the index bits according to the judgment of the symbol ofan imaginary part of the received signal. The received complex signal real part and imaginary part are respectively subjected to demapping of the M-order PAM constellation diagram to recover the transmission constellation bits.
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Description

technical field

[0001] The present invention relates to a modulation method of visible light communication based on carrier index modulation and its realization system, in particular to a modulation method suitable for visible light communication of carrier index modulation (IM) and orthogonal frequency division multiplexing (OFDM), which belongs to visible light communication technology field. Background technique

[0002] With the commercial use of 4G communication technology and the rapid growth of mobile communication users, spectrum resources have become an important limiting factor for the development of communication technology. Because visible light communication has abundant spectrum resources that can be used without authorization, it has attracted extensive attention from researchers at home and abroad. Compared with traditional wireless communication, visible light communication can realize information transmission while lighting; visible light has no electromag...

Claims

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