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Data transmission method for wireless cooperative relay system

A data transmission method and cooperative relay technology, applied in the field of computer network communication, can solve the problems of channel capacity waste and inefficiency, and achieve the effect of improving the erasure ability.

Inactive Publication Date: 2011-02-09
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] There are two problems in the ARQ protocol: first, the ARQ protocol needs a feedback channel, and many application scenarios do not have a feedback channel (such as broadcast and multicast services); second, retransmission is a huge waste of channel capacity, Under low channel erasure probability conditions, many unnecessary ACK frames are transmitted, under high channel erasure probability conditions, many redundant retransmissions are transmitted
But obviously, this strategy is very inefficient when multiple nodes want to send data

Method used

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  • Data transmission method for wireless cooperative relay system
  • Data transmission method for wireless cooperative relay system
  • Data transmission method for wireless cooperative relay system

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Embodiment Construction

[0018] A typical application scenario of the present invention is three-node cooperative relay. Through the joint setting of node transmission power and receiving sensitivity, the coverage of the signal is just satisfied. The two nodes that initiate data transmission are mutually hidden terminals. They cannot perceive each other's existence and can only communicate with each other with the assistance of relay nodes. .

[0019] First, digital fountain code encoding is performed on the application layer data of the source node. The digital fountain code was originally designed for the deletion channel, and its biggest feature is the code rate independence, that is, the number of coded symbols that the coder can generate is infinite and flexible, and the decoder only needs to receive any sufficient number of coded symbols Symbols can restore data. Therefore, regardless of the deletion probability of the deletion channel, the encoder can continuously generate encoding symbols un...

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Abstract

The invention belongs to the technical field of computer network communication, and relates to a data transmission method for a wireless cooperative relay system. The method comprises the following steps of: performing digital fountain code coding processing on application layer data of an information source node to acquire an application layer coding data packet; encapsulating head of each layer of a protocol stack of the acquired data packet, modulating and transmitting the data packet to a wireless channel for transmission; receiving a stacked electromagnetic wave signal on the wireless channel by a relay node, demodulating according to the mapping relationship of network coding in a physical layer, and demodulating and transmitting by a relay node; and detracting information per se from received information by a target node to acquire information of the opposite side, and decoding in the application layer by the digital fountain code decoding algorithm. The method can improve the erasing capability, throughput, packet delivery fraction and interference performance of the system.

Description

technical field [0001] The invention belongs to the technical field of computer network communication and relates to a data transmission method. Background technique [0002] The data in the network using the TCP / IP protocol is transmitted in the form of data packets. Usually, the feedback channel ARQ is used to ensure the correct transmission of each data packet. It is generally believed that each data packet at the receiving end of the transmission is either correctly Received, or lost entirely, this style of communication actually fits the model of a Binary Erased Channel (BEC). [0003] There are two problems in the ARQ protocol: first, the ARQ protocol needs a feedback channel, and many application scenarios do not have a feedback channel (such as broadcast and multicast services); second, retransmission is a huge waste of channel capacity, Under low channel erasure probability conditions, many unnecessary ACK frames are transmitted, and under high channel erasure prob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W28/06H04L1/00
Inventor 金志刚杨雪赵西满
Owner TIANJIN UNIV
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