Long Code Generation for LTE Control Information
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Generating a long-length code with a low code rate while maximizing the minimum distance between codes is challenging, particularly in the 3GPP LTE system, where error correction during control information transmission is critical.
Innovation Solution
A method involving the repetition and adjustment of basic simplex codes, such as puncturing or inserting bits, to generate a codeword that maximizes the minimum distance, ensuring optimal error correction performance for downlink control information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a long-length code with very low code rate is generated, then error correction capability is improved, but minimum distance between codes cannot be maximized
Solution Approach 1:
The patent segments the long code generation process into two parts: first generating a basic code with optimized minimum distance, then repeating it multiple times to achieve the required long code length. This segmentation allows the basic code to maintain maximum minimum distance while the repetition provides the necessary code length and low code rate for improved error correction capability.
Solution Approach 2:
The patent employs periodic repetition of the basic code to generate the final long code. By repeating the basic code structure multiple times, the system achieves the required code length and low code rate while maintaining the error correction properties of the original basic code, thus resolving the contradiction between code length and minimum distance.
2Reliability
If code length is increased to achieve low code rate, then error correction performance is improved, but minimum distance between codes decreases
Solution Approach 1:
The patent divides the code structure into a reusable basic code segment that is repeated multiple times. This segmentation ensures that each segment maintains the maximum minimum distance property, while the overall code length increases through repetition, thereby improving error correction performance without sacrificing minimum distance.
Solution Approach 2:
The patent creates multiple copies of the optimized basic code to form the long code. By copying the basic code structure rather than generating a completely new long code, the system preserves the minimum distance characteristics of the basic code while achieving the required code length and low code rate for enhanced error correction performance.
Data Source
Figure 1
Figure 2
Figure 3(a)~3(c)
AI summary
A method for transmitting downlink control information and a method for generating a codeword for the same are disclosed. In generating a long code having a low code rate, a basic code of which minimum distance between codes is maximized is repeated by a prescribed number of times and bits of the repeated code are adjusted. Therefore, a minimum distance condition between codes of a long code is satisfied and simultaneously the code can be simply generated. Furthermore, control information can be transmitted with a low error rate by using the generated code.