Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Clock estimation method of bi-direction relay channel physical layer network coding

A technology of network coding and two-way relay, which is applied in the field of clock estimation of physical layer network coding of two-way relay channel

Inactive Publication Date: 2015-01-21
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF3 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this is at the expense of increasing system complexity and reducing system information transmission efficiency

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Clock estimation method of bi-direction relay channel physical layer network coding
  • Clock estimation method of bi-direction relay channel physical layer network coding
  • Clock estimation method of bi-direction relay channel physical layer network coding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] The present invention will be further described below in conjunction with accompanying drawings and examples.

[0028] figure 1 Overall block diagram of clock estimation for bidirectional relay channel PNC. figure 2 The training sequence structure on the first node (1) and the second node (2) is given, where L is the length of the cyclic prefix and cyclic suffix, L t is the length of the training sequence.

[0029] Provide the concrete steps that the present invention realizes below:

[0030] (1) First generate a length of L t The CAZAC sequence (the present invention adopts the Chu sequence), s=[s(0) s(1) ... s(L t -1)], constructed from s with a length of L t s' of +4L, s'=[s(0) s(1) ... s(L t -1) s(0) s(1) … s(4L-1)], the final length is L t training sequence c i , c i =[s'((2i-1)L) s'((2i-1)L+1) ... s'((2i-1)L+L t -1)] (i=1,2).

[0031] (2)c 1 ,c 2 After root-raised cosine pulse shaping, they are transmitted simultaneously from the first node (1) and the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a brand new orthogonality-training-based clock estimation method of bi-direction relay channel physical layer network coding. In a bi-direction relay channel PNC, two signals arrive at a relay node at different time, and then relative time migration exists. According to the method, firstly, the relative time migration is converted into the difference of two absolute time migrations, secondly, the two absolute time migrations are estimated, and finally, the estimation value of the relative time migration is obtained. According to the estimation of the two absolute time migrations, two estimation algorithms including the optimization sampling point algorithm and the interpolation algorithm based on discrete Fourier transform are put forward. The estimation on any absolute time migration can be achieved through any algorithm. By means of a Matlab simulation platform, the feasibility of the brand new orthogonality-training-based clock estimation method is verified, and the optimal algorithm combination is found. By means of the combination, when the signal to noise ratio is small, the mean square error of the system is very close to the theory lower bound, and meanwhile the calculation amount is small.

Description

technical field [0001] The invention belongs to the field of digital communication, and in particular relates to a clock estimation method for bidirectional relay channel physical layer network coding. Background technique [0002] In 2006, Shengli Zhang et al. proposed the concept of Physical-Layer Network (PNC). It is different from most communication systems that regard the signal sent by the non-target source as interference and suppress it, but uses the natural superposition of electromagnetic waves in the propagation space, and the relay end encodes in the physical layer according to certain rules according to the received superimposed signal , the coded information is sent, and the terminal obtains the transmitted information according to the decoding rules, so that the interference becomes a part of the algorithm operation in the network coding. It can greatly improve the throughput of the system, for example, in the two-way relay channel, compared with the traditio...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04J3/0635
Inventor 党小宇李强虞湘宾黎宁
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com