Broadcast Transmitter LDPC Repetition and Parity Puncturing

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Solution Overview

Problem

Current signal transmitter and receiver technologies for digital broadcasting lack improved performance in transmitting and receiving schemes, particularly in high definition digital television and portable broadcasting devices, necessitating enhanced methods for better signal transmission and reception.

Innovation Solution

A transmitter system utilizing a Low Density Parity Check (LDPC) encoder, repeater, and puncturer to encode and repeat bits of a broadcasting signal, including the selection and addition of parity bits based on specific calculations to improve decoding performance at the receiver.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If bits are repeated to improve decoding performance, then reliability is improved, but device complexity increases

Engineering Contradiction:

Improvedecoding performanceVSAvoidtransmitter structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The transmitter is divided into distinct functional modules: an LDPC encoder for encoding input bits, a repeater for selecting and repeating specific bits, and a puncturer for removing selected parity bits. This segmentation allows each module to perform its specific function independently, improving decoding performance through bit repetition while managing complexity through modular design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of repeating all bits in the LDPC codeword, the repeater selectively repeats only certain bits (such as parity bits or specific positions) based on the repetition rate and pattern. This partial action approach improves decoding performance for critical bits without unnecessarily increasing the overall transmission length and complexity.

Inventive Principle:

Principle #16Partial or excessive action

2Productivity

If parity bits are punctured to reduce transmission overhead, then loss of information increases, but productivity improves

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidparity bit information

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The puncturing pattern is predetermined and agreed upon between transmitter and receiver before transmission begins. The transmitter pre-identifies which parity bits will be punctured based on the code rate and transmission requirements, allowing the receiver to compensate for the missing bits using the known pattern and the repeated bits, thus maintaining transmission efficiency while managing information loss.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The code rate is adjusted by changing the puncturing rate - the proportion of parity bits that are removed. By dynamically adjusting this parameter, the system can optimize transmission efficiency for different channel conditions while the receiver uses the corresponding puncturing pattern information to correctly decode the transmitted data.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11025282B2Transmitter and repetition method thereof

Publication Date: 2021.06.01 SAMSUNG ELECTRONICS CO LTD

AI summary

A transmitter is provided. The transmitter includes: a low density parity check (LDPC) encoder configured to encode input bits to generate an LDPC codeword including the input bits and parity bits; a repeater configured to select at least a part of bits constituting the LDPC codeword and add the selected bits after the input bits; and a puncturer configured to puncture at least a part of the parity bits.