Hybrid automatic repeat request method for joint polar encoding and decoding in the Internet of Things

Abstract

The invention discloses a hybrid automatic retransmission request method of joint polarization encoding and decoding in the Internet of Things. In the IoT communication scenario, the first information packet is directly modulated and sent to the channel after CRC encoding. If the receiving end does not detect an error, it will feed back an ACK signal and start a new packet transmission; if the first transmission error occurs, the receiving end will feed back a NACK signal. The sender adopts polar code encoding and decoding for the information packet for transmission. If the decoding fails, joint coding and decoding is performed, that is, a certain amount of information is selected from the information package that failed the last transmission to be jointly encoded with the new information package, and joint decoding in the fallback freezing mode is performed at the receiving end. And optimize the two parameters of packet size and retransmission rate to obtain maximum throughput. The transmission mechanism of the present invention is simple and effective, is applicable to the scene of the Internet of Things, and can effectively improve the throughput of the system under the condition of ensuring low power consumption of the terminal equipment of the Internet of Things.

Description

technical field [0001] The present invention relates to the technical field of channel coding for wireless communication, more specifically, a hybrid automatic retransmission request method for joint polarization coding and decoding in the Internet of Things. Background technique [0002] Polar code is a new channel coding method first proposed by Turkish scholar Arikan in 2009 based on channel polarization theory, and it is also the first constructable coding method that can be proved to achieve channel capacity through theoretical methods. In addition to the achievable capacity, the polar code has a regular coding structure, excellent robustness and a structured construction method. [0003] The ideological basis of polar code coding is channel polarization. N=2 to be coded n (n=1,2,3...) bits are considered to be transmitted in the corresponding N bit channels. After linearly merging and splitting the N bit channels, the phenomenon of "two-level differentiation" will ap...

AI Technical Summary

Problems solved by technology

However, the existing polar code-based HARQ transmission mechanism is not suitable for IoT scenarios

The HARQ retransmission control based on Chase combination is simple, but the throughput efficiency is low; although the HARQ based on incremental redundancy can obtain higher throughput, due to the complex retransmission control, high computational complexity, large storage space, hardware implementation requirements High, and it is not well suited for IoT applications with low complexity and low power consumption of terminal equipment

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