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A Low Complexity Design Method for Variable Rate Harq-IR

A low-complexity, design-method technology, applied in the direction of transmission rate adjustment, link quality-based transmission modification, digital transmission system, etc., can solve the problems of high system complexity, high interruption probability and high computational complexity of spectral efficiency, and The effect of broad applicability

Active Publication Date: 2021-03-19
JINAN UNIVERSITY
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Problems solved by technology

[0004] On the other hand, variable rate HARQ-IR has significant advantages in spectral efficiency compared with traditional constant rate HARQ-IR methods. However, the complexity of this HARQ-IR system is high, which leads to the calculation of the corresponding outage probability and spectral efficiency. relatively higher

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  • A Low Complexity Design Method for Variable Rate Harq-IR
  • A Low Complexity Design Method for Variable Rate Harq-IR
  • A Low Complexity Design Method for Variable Rate Harq-IR

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Embodiment

[0047] In this embodiment, a transmission rate optimization method of variable rate HARQ-IR is designed. According to the variable rate HARQ-IR protocol, such as figure 1 As shown in , the original b information bits are encoded into L symbol long codewords firstly, and the L symbols obey random and independent complex normal distribution. Next, the generated long codeword is divided into K sub-codewords, and each sub-codeword has a length of L k and satisfied Then K is the maximum allowable number of transmissions. Different from the constant rate transmission method of traditional HARQ-IR, it assumes that all K sub-codewords have the same length, that is, L 1 =…=L K , but the variable rate HARQ-IR does not require this restriction, that is, the retransmission rate of each round can be different. Therefore, variable rate HARQ-IR can adjust the transmission rate during each transmission to adapt to the corresponding channel conditions. K sub-codewords are sent to the re...

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Abstract

The invention discloses a design method of a low-complexity variable rate hybrid automatic repeat quest of incremental redundancy (HARQ-IR), belonging to the technical field of wireless communication.The method comprises following steps: firstly, the HARQ-IR transmission rate per round is designed to maximize spectral efficiency and ensure low outage probability; in order to reduce the computational complexity and expand the application range, the Beckman channel model is used to derive the approximate expression of the interrupt probability and spectral efficiency of the variable rate HARQ-IR and theapproximate expressions of IR outage probability and spectral efficiency are substituted into the original problem. Then the optimization problem is decoupled into a series of univariate quantum optimization problems by using alternating iterative algorithm. Finally, the concave fractional optimization technique is used to transform each sub-optimization problem into a convex problem forglobal solution, and the Dinkelbach algorithm is executed iteratively until each sub-optimization problem converges. Compared with the traditional precise design method of constant rate HARQ-IR,the method has the advantages of wide application range, low complexity and high spectral efficiency.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a low-complexity variable-rate incremental redundant hybrid automatic repeat request (HARQ-IR) design method. Background technique [0002] Since Hybrid Automatic Repeat Request (HARQ) can achieve reliable transmission, HARQ is widely adopted in various wireless communication standards, and HARQ will definitely play a very important role in achieving the ultra-reliability goal of 5G communication. Among them, Incremental Redundancy HARQ (HARQ-IR) is proved to be the most effective HARQ scheme, which not only guarantees transmission reliability, but also greatly improves spectrum efficiency, but this method sacrifices computational complexity. Therefore, in order to further reduce the computational complexity, it is imperative to accurately analyze the performance of the HARQ-IR system, use the performance analysis results to provide a basis for simplifying the syst...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L1/18
CPCH04L1/0002H04L1/1819
Inventor 施政杨光华李童马少丹屈挺
Owner JINAN UNIVERSITY
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