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An optimization method for realizing wireless relay transmission based on usrpn200

An optimization method and wireless relay technology, applied in radio transmission system, wireless communication, transmission system, etc., can solve problems such as limited transmission capacity, achieve effective and correct transmission, improve data transmission mode, and improve reliability

Active Publication Date: 2021-03-30
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, wireless cooperative relay technology focuses on the use of diversity to resist multipath fading, which has limited effect on improving the transmission capacity of the system)

Method used

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  • An optimization method for realizing wireless relay transmission based on usrpn200
  • An optimization method for realizing wireless relay transmission based on usrpn200
  • An optimization method for realizing wireless relay transmission based on usrpn200

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Embodiment Construction

[0031] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0032] A method for realizing optimization of wireless relay transmission based on USRPN200, specifically comprising the following steps:

[0033] Step 1, read the multimedia data, if the data is less than the maximum processing length of the device (4096kb), pack it into a data frame, perform GMSK modulation, and send the signal through the USRP radio frequency front end; Figure 11 It is a flow chart of sending multimedia data at the sending end of the USRP terminal of the present invention;

[0034] Step 2. Wait for the USRP RF front-end of multiple relay nodes to receive digital signals. If the signal is detected, the signal will be processed by the frequency conversion filter for GMSK demodulation, frequency phase-locked loop, clock recovery, and Costa loop. ; Wherein, the frequency phase-locked loop is used to eliminate the frequency offset,...

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Abstract

The invention discloses a USRPN200-based wireless relay transmission realization optimization method, and makes it applicable to different types of multimedia data transmission. This transmission technology has been implemented on the USRP platform, with signal processing and time synchronization occurring in the GNU Radio environment, realizing resource and power sharing among multiple nodes, overcoming multipath fading, and realizing virtual MIMO. In the indoor environment, the multi-hop network is replaced by cooperative relay transmission, Gaussian minimum frequency shift keying modulation is used, and the network design uses a decode-and-forward scheme, using frequency phase-locked loop, Costa ring to eliminate frequency offset and phase frequency shift. Synchronization between multiple relay nodes is achieved by using stream labels in GNU Radio, and at the destination node of cooperative communication, copies of multiple relay signal transmissions are merged by using equal gain ratio combining.

Description

technical field [0001] The invention belongs to the technical field of software radio information transmission, and in particular relates to a USRPN200-based wireless relay transmission realization optimization method. Background technique [0002] In recent years, while the rapid development of mobile Internet communication technology facilitates people's lives, the coexistence of multiple communication systems and the emergence of communication standards have caused difficulties in realizing regional roaming and compatibility and inheritance of different communication systems. These communication standards limit the intercommunication and compatibility of various hardware devices due to different radio frequency carrier frequencies and modulation methods, resulting in waste and investment. Traditional communication systems based on hardware are difficult to meet this status quo. And software defined radio technology (SDR) can fundamentally solve these problems. Software D...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/024H04B7/155H04B1/00H04W56/00H04L1/18
CPCH04B1/0007H04B7/024H04B7/15507H04L1/1867H04W56/001
Inventor 田峰杨小芳陈建新周亮杨震
Owner NANJING UNIV OF POSTS & TELECOMM
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