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Wireless relay transmission realization optimization method based on USRPN200

An optimization method and wireless relay technology, applied in the directions of radio transmission system, transmission system, wireless communication, etc., can solve the problem of limited transmission capacity, and achieve the effect of effective and correct transmission, improving reliability, and optimizing coverage.

Active Publication Date: 2018-06-29
NANJING UNIV OF POSTS & TELECOMM
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  • 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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  • Wireless relay transmission realization optimization method based on USRPN200
  • Wireless relay transmission realization optimization method based on USRPN200
  • Wireless relay transmission realization optimization method 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 wireless relay transmission realization method based on USRPN200. The method is suitable for multimedia data transmission of different types. This transmission technology hasbeen realized on a USRP platform, the signal processing and the time synchronization is generated in the GNU Radio environment, the resource and power sharing is realized among multiple nodes, the multi-path fading is overcome, and the virtual MIMO is realized. In the indoor environment, the multi-hop network is replaced with the cooperative relaying, the modulation is performed by using Gaussianminimum frequency-shift keying, the network design adopts a decoding forwarding scheme, the frequency phase-locked loop and the Costas loop are used for eliminating the frequency offset and the phasefrequency-shift. The synchronization among multiple relay nodes is realized by using a flow label in the GNU Radio, the transcripts transmitted by multiple relay signals are combined by using equal gain ratio combination at a destination node of the cooperative communication.

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 Applications(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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