Broadcast Transmitter LDPC Shortening with Nonsequential Bit Groups
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current digital broadcasting systems face challenges in providing improved performance and error rates in signal transmission and reception, particularly in high-definition digital television and portable broadcasting, due to limitations in existing transmitter and receiver technologies.
Innovation Solution
A transmitter is designed with an outer encoder, zero padder, and LDPC encoder to encode input bits, pad zero bits, and divide them into bit groups based on a predetermined shortening pattern, improving bit error rate (BER) and frame error rate (FER) performance by strategically positioning LDPC information bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional encoding methods are used in digital broadcasting systems, then the transmission process is simple, but the bit error rate and frame error rate are high
Solution Approach 1:
The information bits are divided into multiple bit groups (first bit group, second bit group, third bit group) with different sizes. This segmentation allows selective zero-padding on specific groups to achieve better error rate performance while maintaining manageable complexity through structured organization of encoded data
Solution Approach 2:
Different bit groups are assigned different qualities through selective zero-padding. The first bit group receives zero-padding while the second and third bit groups do not, creating local quality differences that optimize overall system reliability by protecting more critical information segments
2Reliability
If zero bits are padded to all bit groups, then the bit error rate performance improves, but the complexity of determining padding positions increases
Solution Approach 1:
The system segments bit groups into different categories (first bit group that receives zero-padding, second and third bit groups that do not). This segmentation simplifies the padding determination process by establishing clear rules for which groups receive padding, reducing complexity while maintaining performance benefits
Solution Approach 2:
The system changes the parameter of zero-padding application from uniform (all groups) to selective (specific groups based on size and position). This parameter change optimizes bit error rate performance by applying padding where most beneficial while avoiding unnecessary complexity in other groups
Data Source
AI summary
A transmitter is provided. The transmitter includes: an outer encoder configured to encode input bits to generate outer-encoded bits including the input bits and parity bits; a zero padder configured to constitute Low Density Parity Check (LDPC) information bits including the outer-encoded bits and zero bits; and an LDPC encoder configured to encode the LDPC information bits, wherein the LDPC information bits are divided into a plurality of bit groups, and wherein the zero padder pads zero bits to at least some of the plurality of bit groups, each of which is formed of a same number of bits, to constitute the LDPC information bits based on a predetermined shortening pattern which provides that the some of the plurality of bit groups are not sequentially disposed in the LDPC information bits.