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A Fountain Code Collaborative Communication Method in Multiple Relay Scenarios

A technology of cooperative communication and fountain code, which is applied in wireless communication, signaling distribution, and characterized by signaling, can solve the problems of ineffective selection of relay nodes and low efficiency of cooperative transmission

Active Publication Date: 2021-08-24
HANGZHOU DIANZI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0023] However, existing cooperative transmissions are inefficient and cannot effectively select relay nodes

Method used

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  • A Fountain Code Collaborative Communication Method in Multiple Relay Scenarios
  • A Fountain Code Collaborative Communication Method in Multiple Relay Scenarios
  • A Fountain Code Collaborative Communication Method in Multiple Relay Scenarios

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Embodiment 1

[0069] like Figure 1 Shown, the present embodiment proposes a multi-fountain scenario code cooperative relay communication method, comprising:

[0070] Step S1, the packet to be transmitted is encoded;

[0071] The present invention uses a first type fountain code encoding LT code, such as figure 2 , The particular coding steps are as follows:

[0072] The Group K in the original packet (1, k) in accordance with the distribution of the degree Ω, randomly selected integer d i , Set the degree of encoding group; randomly extract D in the packet i A packet, as a neighbor of the encoded packet.

[0073] Using the degree distribution as follows:

[0074] Ω (x) = 0.008X + 0.493X 2 + 0.166X 3 + 0.073X 4 + 0.083X 5 +0.056 8 +0.037 9 +0.056 19 + 0.025X 65 +0.003 66

[0075] Wherein, x is indicated by the input symbol, the index represents the degree of output symbol, and the corresponding coefficient represents the probability of selecting the degree.

[0076] Step S2, broadcast the encod...

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Abstract

The invention discloses a fountain code cooperative communication method in a multi-relay scenario, comprising steps: step S1, encoding a data packet to be sent; step S2, broadcasting the encoded data packet to a relay node and a destination node, and calculating The packet loss rate of each link; step S3, calculate the weight selection vector based on the link channel state and the node decoding situation, and select the data packet according to the weight selection vector; step S4, calculate the candidate based on the packet loss rate of the link A set of relay nodes; step S5, if the set of candidate relay nodes is an empty set, start the direct retransmission mode; if the set of candidate relay nodes is not an empty set, select the best relay node for retransmission. The present invention is used to assist in solving problems such as low frequency spectrum utilization rate caused by excessive resource occupation of feedback channel in cooperative communication, waste of space system resources caused by participation of multiple relays in cooperation, and so on, so as to realize efficient and reliable transmission of wireless broadcast channel.

Description

Technical field [0001] The present invention relates to the field of digital communication technologies, and in particular to a multi-relay scenario, a multi-relay scene, a communication method. Background technique [0002] Collaborative relay technology uses the mutual collaboration between nodes to form a virtual multi-input multi-output system, increase system diversity gain, effectively resist multipath fading and improve information transmission reliability. There are three common collaborative methods: amplified forwarding protocol, decoding and forwardingprotocol, and Code Forwarding Protocol. [0003] Enlarge forwarding (AF): A relay node amplifies the direct received signal. The disadvantage is that the noise will be further enlarged when the channel link is poor. Decoding forwarding (DF): The signal decoded and then rebounded after the relay node. The disadvantage is that the error decoding will be further propagated. Encoding Forward (CC): The relay node receives diff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L5/00H04W40/12H04W40/22
CPCH04L1/0026H04L1/0057H04L5/0055H04W40/125H04W40/22
Inventor 曾嵘霍文佳包建荣王天枢姜斌刘超邱雨
Owner HANGZHOU DIANZI UNIV
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