LDPC Zero-Padding Layout in Transmitters for Lower Error Rates
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Solution Overview
Problem
Current digital broadcasting systems face challenges in efficiently managing bit error rates and frame error rates due to limitations in signal transmission and reception methods, particularly in high-definition digital television and portable broadcasting scenarios.
Innovation Solution
A transmitter is designed with an outer encoder, zero padder, and LDPC encoder to encode input bits, pad zero bits based on a preset shortening pattern, and map these bits to form Low Density Parity Check (LDPC) information bits, 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 without strategic bit positioning, then the transmission process is simpler, but the bit error rate and frame error rate performance deteriorates
Solution Approach 1:
The patent applies preliminary action by performing zero-padding with a predetermined pattern before LDPC encoding. The zero padder strategically positions zero bits in specific bit groups based on a preset pattern, preparing the bit sequence in advance to improve BER and FER performance. This preliminary arrangement of bits before encoding resolves the contradiction by enhancing reliability through strategic positioning without requiring complex modifications to the encoding process itself.
2Reliability
If zero bits are padded sequentially in bit groups, then the padding process is simpler, but the error rate performance deteriorates
Solution Approach 1:
The patent applies local quality by implementing a non-uniform zero-padding pattern where different bit groups receive zero bits at different positions according to a predetermined pattern. Instead of uniformly padding all bit groups sequentially, the system selectively positions zero bits in specific locations within specific bit groups. This localized strategic positioning improves error rate performance by addressing vulnerable positions, while the predetermined nature of the pattern keeps the implementation complexity manageable.
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 generate a plurality of bit groups each of which is formed of a same number of bits, maps the outer-encoded bits to some of the bits in the bit groups, and pads zero bits to remaining bits in the bit groups, based on a predetermined shortening pattern, thereby to constitute Low Density Parity Check (LDPC) information bits; and an LDPC encoder configured to encode the LDPC information bits, wherein the remaining bits in which zero bits are padded include some of the bit groups which are not sequentially disposed in the LDPC information bits.