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Full duplex fibre-optical radio communication system of simple structure

A full-duplex, signal technology, used in optical fiber radio, optical fiber transmission, transmission systems, etc., can solve problems such as increasing the cost of base stations, and achieve the effects of simple structure, cost reduction, and photonic device savings

Inactive Publication Date: 2007-07-18
HUNAN UNIV
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Problems solved by technology

[0004] Another problem in the full-duplex ROF communication system is: in the uplink, the signal received by the antenna from the wireless client must be modulated onto the optical carrier by a modulator, and then sent to the central station for optical signal processing
The above technology uses a laser in the base station to generate an optical carrier for the uplink, which obviously increases the cost of the base station

Method used

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  • Full duplex fibre-optical radio communication system of simple structure
  • Full duplex fibre-optical radio communication system of simple structure

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Embodiment Construction

[0043] The present invention will be described in detail below in conjunction with specific experimental examples and accompanying drawings.

[0044] As shown in Figure 1, the components and functions of the central station of full-duplex optical fiber wireless communication are described as follows:

[0045]Data source 1, produces the digital baseband signal of downlink, and radio frequency signal generator 2, produces the radio frequency signal that frequency is fO, electric mixer 3, is used for the digital baseband signal that data source 1 produces and radio frequency signal generator 2 produces The radio frequency signal is mixed to generate electrical millimeter waves. The laser 4 is used to generate a continuous wave laser of a specified wavelength, and the external modulator 5, driven by the electric millimeter wave output from the mixer, modulates the continuous wave laser generated by the laser 4, thereby generating a double-sideband modulation signal, double-sideban...

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Abstract

This invention discloses a fiber radio communication system of a simple structure and capable of providing full-duplex communication in the ROF communication system, which uses an electric mixer to generate mm wave signals at the central station and carries out double-side-band modulation to the signals to generate double-side-band modulated signals to be sent to the base station, takes the central carrier wave in the signals as the light carrier in the up link and applies a photomodulator to modulate data in the up link of a user mobile terminal onto the light carrier to be sent to the base station for treatment and picks up double-frequency one step side-band in the signals to generate necessary electric-mm waves by a photo-detector and emitted by an antenna.

Description

(1) Technical field [0001] The invention belongs to the technical field of hybrid optical fiber-wireless communication (Radio-over-Fiber, abbreviated as ROF) communication system. (2) Background technology [0002] Since the communication frequency adopted by the next-generation ultra-wideband wireless communication technology will extend to the millimeter wave band, in order to overcome the limitations of wireless communication such as transmission distance and meet the broadband requirements in wireless communication, the existing optical fiber communication technology must be used, so fiber-wireless Communication (Radio-Over-Fiber, ROF for short) will become the most promising technology to solve the next generation ultra-broadband wireless access. The ROF system can make full use of the huge bandwidth of optical fibers to reduce costs and combine the flexibility of wireless communication technology to integrate wireless and optical networks into a new type of access that...

Claims

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Application Information

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IPC IPC(8): H04B10/12H04B10/155G02F1/00H04B10/2575
Inventor 余建军陈林
Owner HUNAN UNIV
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