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A Clock Estimation Method for Bidirectional 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: 2017-11-03
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

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

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  • A Clock Estimation Method for Bidirectional Relay Channel Physical Layer Network Coding
  • A Clock Estimation Method for Bidirectional Relay Channel Physical Layer Network Coding
  • A Clock Estimation Method for Bidirectional Relay Channel Physical Layer Network Coding

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[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...

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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...

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Application Information

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Patent Type & Authority Patents(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
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