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Bidirectional multi-service access ROF transmission system and method for realizing carrier wave reuse by applying polarization multiplexing

A technology of multi-service access and polarization multiplexing, applied in polarization multiplexing systems, electromagnetic wave transmission systems, transmission systems, etc., and can solve problems such as increasing the complexity and cost of base stations

Active Publication Date: 2016-06-29
BEIJING UNIV OF POSTS & TELECOMM
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  • Claims
  • Application Information

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Problems solved by technology

However, these methods also increase the complexity and cost of the base station

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  • Bidirectional multi-service access ROF transmission system and method for realizing carrier wave reuse by applying polarization multiplexing
  • Bidirectional multi-service access ROF transmission system and method for realizing carrier wave reuse by applying polarization multiplexing

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Embodiment Construction

[0039] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings.

[0040] figure 2 It is a structural schematic diagram of a two-way multi-service access ROF transmission system that applies polarization multiplexing to realize carrier reuse in the present invention. Combine now figure 2 , the application of polarization multiplexing in the present invention to realize the bidirectional multi-service access ROF transmission system structure of carrier reuse is described, specifically as follows:

[0041] In the present invention, the two-way multi-service access ROF transmission system that applies polarization multiplexing to realize carrier reuse includes: a central station module 20 , a base station 21 , and a user unit 22 .

[0042] The central station module 20 uses the laser 2001 to generate continuous light as the carrier, an...

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Abstract

The invention provides a bidirectional multi-service access ROF transmission system and method for realizing carrier wave reuse by applying polarization multiplexing. According to the invention, optical carrier wave inhibition signals whose energy is concentrated at positive and negative first-order sidebands is generated at a center station, then multi-service signals are modulated to the positive first-order optical sideband, the polarization state of the negative first-order sideband is controlled to form an included angle of 45 degrees with an original polarization state, and thus modulation of multi-service optical millimeter waves is completed. Optical signals are transmitted to a base station via a fiber link and are divided into two parts through polarization separation, one part is converted into multi-service electric millimeter waves through photoelectric detection and is sent by an antenna after amplification, and at a user unit, the antenna receives and respectively demodulates signals of each service; and the other part is taken as optical carrier waves of uplink signals for sending to the center station by carrying radiofrequency signals, and radio frequency baseband signals are obtained through photoelectric conversion at the center station.

Description

technical field [0001] The invention relates to a two-way multi-service access ROF transmission system and method that implements carrier reuse by applying polarization multiplexing, which is a certain supplement to the existing communication technology. Background technique [0002] At present, low-frequency wireless technologies (including LTE, WiFi, WiMax, etc.) have received great attention due to their mobility, flexibility, and convenient access. On the other hand, the growing mobile multimedia services have a high data transmission rate, and the planned transmission rate can reach several Gbit / s, thus requiring large bandwidth to meet the demand for high-speed wireless information access, which undoubtedly greatly promotes the high-frequency millimeter wave The development of wireless access technology. In order to meet the demand for larger bandwidth and higher speed, the signal needs to work in a higher frequency band, and the open transmission bandwidth of 7-9GHz ...

Claims

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Application Information

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IPC IPC(8): H04B10/50H04B10/54H04B10/61H04B10/69H04B10/2575H04J14/02H04J14/06
CPCH04B10/2575H04B10/5057H04B10/54H04B10/6151H04B10/691H04J14/0261H04J14/06
Inventor 田凤忻向军刘博张丽佳吕凯田清华张琦王拥军尹霄丽
Owner BEIJING UNIV OF POSTS & TELECOMM
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