Symbol detection method of DCO-OFDM (Direct Current Offset-Orthogonal frequency Division Multiplexing) system

A detection method and symbol technology, applied in the field of symbol detection of DCO-OFDM systems, can solve the problem of not fully considering the internal structure of the transmitted signal, and achieve the effect of easy implementation and small calculation amount
CN104158784AActive Publication Date: 2014-11-19SOUTHEAST UNIV
6 Cites 10 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHEAST UNIV
Publication Date
2014-11-19

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a symbol detection method of a DCO-OFDM (Direct Current Offset-Orthogonal frequency Division Multiplexing) system, belonging to the field of visible light wireless communication. The method is carried out according to the following steps of firstly, preprocessing a received symbol r(n) to obtain an estimated value x(clip)n of a clipped sending signal; secondly, reconstructing clipping noise c(n) and subtracting the clipping noise from the signal x(clip)n to obtain an estimated value x(clip)n of an unclipped sending signal; thirdly, carrying out frequency domain conversion and symbol judgment operation on the x(n), and reconstructing the clipping noise c(n) by utilizing a judged symbol; fourthly, repeating the steps to reach a preset number of iterations; and lastly, demodulating the judged symbol to restore transmitted bits. According to the symbol detection method provided by the invention, the negative effect of the clipping noise on the detection performance can be reduced, an effective signal to noise ratio of a receiving signal is increased, in comparison with the conventional symbol detection method, the better detection performance can be obtained. Meanwhile, the method provided by the invention only needs simple symbol taking operation and DFT / IDFT (Discrete Fourier Transform / Inverse Discrete Fourier Transform) operation and has the advantages of small calculated amount and easiness in implementation.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the field of visible light wireless communication, in particular to a symbol detection method of a DCO-OFDM system. Background technique

[0002] At present, the 5th generation cellular mobile communication technology is becoming a research hotspot in the field of mobile communication. Compared with the existing communication system, the capacity of the fifth generation cellular mobile communication system will be increased by 1 to 2 orders of magnitude. Therefore, the development of new spectrum resources has become an important way. Visible light is a new spectrum resource with extremely wide bandwidth, and visible light wireless communication technology is also considered an important part of the fifth-generation mobile communication technology. Existing visible light wireless communication technologies mainly use light emitting diode (LED, Light Emitting Diode) or laser as a light source, and adopt an intensity modulation...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More