Cooperative transmission method based on distributed non-binary LDPC code

Abstract

The invention discloses a cooperative transmission method based on a distributed non-binary LDPC (Low Density Parity Check) code and belongs to the wireless communication field. A source node independently broadcasts data to a destination node and a relay node, the relay node achieves distributed non-binary LDPC encoding to the correctly received data of the source node and then forwards the data, the destination node merges signals from the source node and the relay node to form a code word of the non-binary LDPC code, and soft-input and soft-output iterative decoding is carried out to restore data of the source node. According to the cooperative transmission method provided by the invention, the encoding and transmission of the source node and the relay node are realized in a distributed manner, so that the processing complexity is low; as the non-binary LDPC code is adopted as the encoding scheme, and the diversity gain and the encoding gain are acquired at the same time through iterative decoding, so that noise and fading are effectively prevented.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a cooperative transmission method based on distributed non-binary LDPC codes. Background technique [0002] With the development of wireless networks, the ever-increasing number of users and service requirements impose higher requirements on wireless networks. However, the wireless channel has fading characteristics. The radio waves attenuate continuously with the increase of the communication distance, resulting in large-scale fading. The shadow fading caused by objects such as buildings and trees causes mesoscale shadow fading. It is affected by the movement of network nodes and the multipath propagation of radio waves Due to the influence of factors such as small-scale fading, which restricts the performance of wireless networks; furthermore, wireless spectrum resources are becoming more and more tense, and the trend of green communication is becoming more and more obviou...

AI Technical Summary

Problems solved by technology

[0009] Although non-binary LDPC codes can achieve linear time coding, compared with binary LDPC codes, non-binary LDPC codes still have relatively high coding complexity

If non-binary LDPC encoding is used to encode data in the source node of direct transmission or in the source node and relay node participating in cooperative transmission, the complexity of the source node and relay node is increased, and the source node and relay node usually It is a user terminal with relatively limited computing and processing capabilities and power resources

Therefore, the cooperative transmission method based on non-binary LDPC coding needs to overcome the complexity problem caused by coding

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