Carrier-free amplitude phase modulation system and modulation method based on Faster-than-Nyquist precoding

A carrier-free amplitude and phase modulation technology, applied in the field of visible light communication, can solve the disadvantages of visible light communication system and other problems, achieve the effect of eliminating guardband, improving system capacity, and eliminating frequency interval

Active Publication Date: 2016-11-09
FUDAN UNIV
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Problems solved by technology

[0004] Carrier-free amplitude-phase modulation (CAP), as a high-spectrum-efficient amplitude modulation, has been proved by experiments to be a very suitable modulation method for visible light communication systems. In the multi-sideband CAP mod...

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  • Carrier-free amplitude phase modulation system and modulation method based on Faster-than-Nyquist precoding
  • Carrier-free amplitude phase modulation system and modulation method based on Faster-than-Nyquist precoding
  • Carrier-free amplitude phase modulation system and modulation method based on Faster-than-Nyquist precoding

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[0047] In order to make the object, technical solution and advantages of the present invention clearer, various embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that, in each implementation manner of the present invention, many technical details are provided for readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.

[0048] The purpose of the present invention is to provide a carrier-free amplitude-phase (FTN-CAP) modulation system and modulation method based on super-Nyquist precoding technology with higher spectral efficiency. The modulation system is applied to visible light communication systems and can Use less modulation bandwidth ...

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Abstract

The invention belongs to the technical field of visible light communication, and especially relates to a carrier-free amplitude phase modulation system and modulation method based on a Faster-than-Nyquist precoding technology. The system and the method are applied to a visible light communication system. The modulation system mainly comprises a QAM mapping module, an I/Q separation module, a differential coding module, a delay addition module, an upper conversion module and a forming filtering module. When signals are processed, the signals are divided into two ways of same direction I and orthogonal Q branches. The upper way and the lower way are processed by the above-mentioned process. Finally, the two ways of signals are combined into one way of signals at a transmitting end through subtraction operation. Compared with a traditional Nyquist bandwidth CAP modulation system, the system and the method have the advantages that Faster-than-Nyquist CAP signals of which signal bandwidth is further compressed can be generated; the guard band between CAP sub-bands can be eliminated; a certain extent of overlap can be tolerated; the signal bandwidth is utilized effectively; and the spectrum efficiency of the visible light communication system is improved.

Description

technical field [0001] The invention belongs to the technical field of visible light communication, and in particular relates to a carrier-free amplitude-phase modulation system and modulation method applied in a visible light communication system. Background technique [0002] Visible light communication (VLC, Visible Light Communication) is a new green information technology that utilizes the fast response characteristics of LEDs to achieve high-speed data transmission. This technology uses LED as a light source, and can enable lighting equipment to have functions such as "wireless router", "communication base station", and "network access point" without affecting normal lighting. Visible light communication, as a new communication mode combining lighting and optical communication, will promote the integrated development and technological progress of next-generation lighting and access networks, and has become the focus and commanding heights of competition at home and abr...

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Application Information

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IPC IPC(8): H04B10/116H04B10/50H04B10/516
CPCH04B10/116H04B10/5055H04B10/516
Inventor 迟楠王智鑫
Owner FUDAN UNIV
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