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An implementation method of an indoor visible light unipolar OFDM communication system

A technology of communication system and implementation method, which is applied in the direction of transmission system, baseband system, multi-frequency code system, etc., can solve the problems of low power utilization rate and low multiplexing gain, achieve high power utilization rate, improve signal-to-noise ratio, The effect of realizing system transmission reliability

Active Publication Date: 2018-12-14
XIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for implementing an indoor visible light unipolar OFDM communication system, which solves the problems of low power utilization and low multiplexing gain of SMP-OFDM systems in the prior art

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  • An implementation method of an indoor visible light unipolar OFDM communication system
  • An implementation method of an indoor visible light unipolar OFDM communication system
  • An implementation method of an indoor visible light unipolar OFDM communication system

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Embodiment Construction

[0034] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] The present invention is an implementation method of an indoor visible light unipolar OFDM communication system. The sending end uses Alamouti coding to perform frequency-domain precoding on ACO-OFDM even subcarriers, and uses bit loading on the even subcarriers to generate antisymmetric signals of different periods. Perform zero clipping on the negative signal; transmit the positive signal to the channel composed of air; recover the signals carried on the odd subcarriers and even subcarriers respectively by the receiving end.

[0036] like figure 1 As shown, it specifically includes the following steps:

[0037] Step a, build an indoor visible light communication platform, and establish an indoor visible light channel; the indoor visible light communication platform includes a sending end, a transmission system and a receiving end (s...

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Abstract

The invention discloses an implementation method of an indoor visible light unipolar OFDM communication system. The even subcarriers of ACO-OFDM are precoded in frequency domain, and the anti-symmetric signals with different periods are generated by bit loading on the even subcarriers, and the negative signals are zero-clipped. A positive signal is transmitted into a channel composed of air. The signals carried on odd subcarriers and even subcarriers are respectively recovered by the receiving end. The invention solves the problem of low power utilization and low multiplexing gain of the SMP-OFDM syste in the prior art .

Description

technical field [0001] The invention belongs to the technical field of indoor visible light communication, and in particular relates to an implementation method of an indoor visible light unipolar OFDM communication system. Background technique [0002] Visible Light Communication (Visible Light Communication) refers to the use of light in the 400-700nm visible light band as an information carrier, without the need for optical fiber and other wired channel transmission media, and a communication method that directly transmits optical signals in the air. Visible light communication can provide an available bandwidth close to 400THz. It has the advantages of being less susceptible to electromagnetic interference, safe and confidential, and will not endanger human eye safety and light signals cannot penetrate walls. It can satisfy users' requirements for communication links that are safe, stable, fast and environmentally friendly. In order to meet the requirements of the field,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/116H04L25/03H04L27/26
CPCH04B10/116H04L25/03159H04L25/03343H04L27/2628H04L27/265
Inventor 邓莉君樊养余柯熙政
Owner XIAN UNIV OF TECH
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