Single side band modulation technique based on bidirectional phase modulator in 4G radio frequency remote system

A phase modulator and single sideband modulation technology, which is applied in multi-carrier systems and other directions, can solve problems such as phase noise and insertion loss

Active Publication Date: 2015-05-13
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
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Problems solved by technology

However, due to the discreteness of the original components, unnecessary insertion loss and phase noise will be in

Method used

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  • Single side band modulation technique based on bidirectional phase modulator in 4G radio frequency remote system
  • Single side band modulation technique based on bidirectional phase modulator in 4G radio frequency remote system
  • Single side band modulation technique based on bidirectional phase modulator in 4G radio frequency remote system

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Embodiment Construction

[0012] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0013] figure 1 The SSB technology schematic diagram based on the bidirectional phase modulator is described in , where S101 is the radio source module (Radio Source Unit), which outputs the binary digital signal in 4G communication, and is passed through the radio frequency modulation module (Radio Modulation Unit) S102 After modulation, the high-frequency carrier (3.5GHz) available in the 4G TDD-LTE frequency band is sent to the 90-degree hybrid coupler S103. The device outputs two high-frequency radio signals with equal amplitude and 90-degree phase difference, which are respectively loaded to the two RF input ports of the dual-drive phase modulator S108. S104 is an Optical Source Unit, which outputs a single carrier (1550nm) laser commonly used in optical communications. The optical carrier is divided into two optical waves with the same amplitude ...

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Abstract

The invention provides a single side band modulation technique based on a bidirectional phase modulator which can be widely applied to a 4G radio frequency remote system. The single side band modulation technique includes the following several steps: a 120 Gbit/s 64QAM radio frequency microwave signal generates two paths of 64 QAM radio frequency microwave signals with a phase difference of 90 degrees through a (radio frequency) 90-degrees mixing coupler, and respectively loads to two radio frequency input ports of the bidirectional phase modulator. Meanwhile, a single wave length light carrier generates two paths of light carriers with equal phase position and the same amplitude through a 50: 50 Y branch coupler, and respectively loads to two different circulators. Input ends 1 of two circulators are connected with two output ends of the Y branch coupler, output ends 2 are connected with two input ends of the bidirectional phase modulator, and input ports 3 are connected with two input ends of one 50: 50 Y branch coupler. Thus two lights output from the Y branch coupler pass through the circulators, the bidirectional coupler, and the 50: 50 coupler, very good single side band modulation signal can be obtained from one output end of the 50: 50 Y branch coupler; besides, the technique can be well applied to a radio frequency remote system.

Description

technical field [0001] The present invention relates to a novel SSB modulation technology in modern communication, more specifically, to the SSB modulation technology based on a bidirectional phase modulator in a remote radio system in the fourth generation of modern communication field. Background technique [0002] With the development of data communication and multimedia services, the fourth-generation mobile communication that meets the needs of mobile data, mobile computing and mobile multimedia operations has begun to emerge. At present, the transmission rate of the fourth-generation mobile communication system can reach 20Mbps, and the highest can reach 100Mbps, which is 50 times the transmission speed of the third-generation mobile communication. Although 4G mobile communication has the characteristics of fast communication speed, wide network spectrum, flexible communication, high intelligent performance, and good compatibility, 4G mobile communication also has limi...

Claims

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Application Information

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IPC IPC(8): H04L27/34
CPCH04L27/34
Inventor 喻松谢志鹏蒋天炜李健李丹叶辛萌顾畹仪
Owner BEIJING UNIV OF POSTS & TELECOMM
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