A Network Coding Method Based on Orthogonal Codes

Abstract

The invention discloses a network coding method based on orthogonal codes and relates to the technical field of wireless communication to reduce the cost during physical layer network coding application. The method includes step S1 of source nodes S1 and S2 replacing respectively generated each information bit through two-bit orthogonal codes, step S2 of the source nodes S1 and S2 sending signals after respective replacement to a relay node R, step S3 of the relay node R separating and recovering the received, superimposed and unsynchronized signals through a secondary sampling method, step S4 of the relay node R aligning and recombining the recovered source nodes S1 and S2 signals to generated superimposed synchronous signals, step S5 of the relay node R respectively transmitting the superimposed synchronous signals to target nodes D1 and D2, step S6 of the target nodes D1 and D2 decoding the received superimposed synchronous signals. The network coding method is applicable to a butterfly network.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a network coding method based on orthogonal codes. Background technique [0002] The concept of Network Coding (NC, Network Coding) was first proposed in a wired multicast network, with the purpose of improving the utilization rate of network bandwidth. Later, with the emergence of Physical-layer Network Coding (PNC, Physical-layer Network Coding), the network coding technology was extended to the field of wireless communication. [0003] An application scenario of physical layer network coding is as follows figure 1 As shown in the classic butterfly network, two source nodes S 1 and S 2 both through the relay node R to the two destination nodes D at the same time 1 and D 2 transmit information. In the butterfly network, in order to ensure that the physical layer network coding can work normally, it is necessary to ensure the existence of a link betwe...

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Problems solved by technology

[0005] However, the inventors of the present application found that the method of adding information in the data header introduces additional overhead, which increases the cost of the application of physical layer network coding

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