Relaying method based on uniquely decodable code

A forwarding method and decoding technology, applied in radio relay systems, active electrical relay systems, digital transmission systems, etc., can solve the problems of reduced system throughput, high bit error rate, and increased number of time slots. The effect of improving throughput and good channel capacity

Active Publication Date: 2014-11-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem that the number of time slots to be transmitted increases and the throughput of the system decreases due to the high bit error rate of the Rayleigh channel and the relay system of M (M>3) nodes in the existing physical layer network coding. A unique decodable based relay forwarding method is provided

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  • Relaying method based on uniquely decodable code
  • Relaying method based on uniquely decodable code
  • Relaying method based on uniquely decodable code

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Experimental program
Comparison scheme
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specific Embodiment approach 1

[0021] Specific implementation mode 1: The uniquely decodable-based relay forwarding method of this implementation mode is implemented in the following steps:

[0022] For an M-node relay system, including M-1 user nodes and a relay node, any user node uses two time slots to obtain information sent by any other user node through the relay node;

[0023] Among them, in the first time slot, all M-1 user nodes will send the uniquely decodable and encoded information to the relay node;

[0024] Then in the second time slot, the relay node sends the judged result in the form of broadcast after judgment and forwarding, and each user node matches the received broadcast information with a unique decodable code, thereby Obtaining the information sent by other user nodes completes the unique decodable-based relay forwarding method.

specific Embodiment approach 2

[0025] Specific implementation mode two: the difference between this implementation mode and specific implementation mode one is: the execution steps of the first time slot are as follows:

[0026] Step 1, all M-1 user nodes pass the effective information data of the user nodes through the unique decodable encoder to obtain the encoded code word d 1 ,d 2 ,...,d M-1 ; Wherein, each of the codewords is an n-dimensional vector;

[0027] Step 2, the M-1 codewords d obtained in step 1 1 ,d 2 ,...,d M-1 , respectively modulated into s 1 ,s 2 ,...,s M-1 , where s i Represents the modulated symbol sent by the i-th user in the first time slot, where i=1,2,...,M-1;

[0028] Step 3, the s in step 2 1 ,s 2 ,...,s M-1 through the channel h 1 ,h 2 ,...,h M-1 , the signal r received at the relay node R ;

[0029] in, r R = Σ i = 1 M ...

specific Embodiment approach 3

[0037] Specific implementation mode three: the difference between this implementation mode and specific implementation modes one or two is that: the execution steps of the second time slot are as follows:

[0038] Step one, will Broadcast through the channel h' through the relay node 1 ,h′ 2 ,... h′ M-1 sent out; where, the channel h' 1 ,h′ 2 ,... h′ M-1 , if h′ 1 =h' 2 =...=h' M-1 =1, then in the second time slot, the broadcast channel between the relay node and each user is the Rayleigh channel;

[0039] If the channel h' 1 ,h′ 2 ,... h′ M-1 Both obey the independent and identically distributed Rayleigh distribution, then in the second time slot, the broadcast channel of the relay node and each user is the Rayleigh channel;

[0040]Step 2, among all M-1 users, send the received broadcast information r 1 ,r 2 ,...,r M-1 verdict Among them, r i Represents the signal received by the i-th user in the second time slot, then r i (1≤i≤M-1) is

[0041] ...

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Abstract

The present invention relates to a relaying method based on uniquely decodable code. The present invention aims to solve the problem of existing physical-layer network coding about high error rate in Rayleigh channel and increased amount of time slots to be transmitted and decreased throughput of system in a system with M (M>3) nodes. For a relay system with M nodes comprising M-1 user nodes and one relay node, any one user node uses two time slots to obtain messages sent from any other user nodes through the relay node; in the first time slot, all of the M-1 user nodes send the messages coded by a uniquely decodable code to the relay node; and in the second time slot, the relay node sends decision results after deciding and forwarding in the form of broadcasting, and each user node matches the received broadcasting messages with the uniquely decodable code. The present invention is applied in communication field.

Description

technical field [0001] The invention relates to a unique decodable-based relay forwarding method. Background technique [0002] With the development of science and technology, Network Coding (NC) has gradually become a popular research field in the communication field. Network coding can be used in wireless network systems and wired network systems, and has a great impact on information theory, wireless communication, network architecture, etc. Physical-layer network coding (PNC) has gradually become an important research hotspot in the field of network coding. PNC improves the throughput of the system by effectively utilizing the properties of relay nodes and reducing the number of time slots that need to be transmitted between nodes. Not only that, PNC can be regarded as a cooperative communication. [0003] The research on PNC mainly focuses on the following directions. First of all, research on PNC coding methods, including convolutional codes, low density parity chec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04B7/15
Inventor 于启月李亚添智小楠孟维晓
Owner HARBIN INST OF TECH
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