LDM Signal Decoding via Layer Segmentation
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Solution Overview
Problem
Existing signal reception and decoding technologies face challenges in efficiently processing layered division multiplexing (LDM) signals in diverse environments, particularly in terms of signal latency and performance.
Innovation Solution
A receiving apparatus and decoding method that utilize a first decoder to decode the first layer of an LDM signal using a parity check matrix, generate LDPC information word bits and parity bits, and a second decoder to decode the second layer by removing the first layer signal, using the generated LDPC information word bits and parity bits to produce information word bits for the second layer, with specific configurations involving LDPC and BCH decoders and encoders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional decoding methods are used for LDM signals, then the decoding process is simpler, but signal latency increases and decoding performance deteriorates in diverse environments
Solution Approach 1:
The patent segments the LDM signal into multiple layers (first layer and second layer) and processes each layer separately through dedicated decoders. The first decoder handles the first layer signal, while the second decoder processes the second layer signal after removing the first layer contribution. This segmentation enables parallel processing paths that reduce overall signal latency while maintaining high decoding performance for each layer independently.
Solution Approach 2:
The patent applies preliminary action by pre-processing the received LDM signal to separate and decode the first layer before proceeding to the second layer. The first decoder performs preliminary decoding of the first layer, and its output is used to subtract the first layer signal from the composite LDM signal, enabling the second decoder to work on a cleaner, pre-separated signal. This preliminary processing reduces the complexity and time required for subsequent decoding stages.
2Adaptability or versatility
If conventional single-layer decoding is used, then the device complexity is lower, but the system cannot efficiently process diverse LDM signal environments
Solution Approach 1:
The patent implements multi-functionality by designing a decoding system that can handle multiple LDM signal configurations and environments. The first decoder and second decoder are configured to process different layer types and modulation schemes, making the system adaptable to various LDM signal formats. The same decoder structure can be applied to different service types and signal conditions, providing universal processing capability across diverse environments.
3Measurement precision
If all parity bits are decoded for both layers, then decoding accuracy improves, but processing time and computational load increase
Solution Approach 1:
The patent extracts and processes only the necessary parity bits for each layer separately. The first decoder extracts and decodes parity bits specific to the first layer, and the second decoder extracts and decodes parity bits specific to the second layer. This selective extraction avoids the computational overhead of processing all parity bits for both layers simultaneously, maintaining high decoding accuracy while improving processing efficiency through targeted parity bit processing.
Data Source
AI summary
A receiving apparatus includes: a first decoder configured to decode a signal transmitted through a first layer from a layered division multiplexing (LDM) signal using a parity check matrix to generate low density parity check (LDPC) information word bits and parity bits; an encoder configured to encode the LDPC information word bits, generated by decoding the signal transmitted through the first layer, using the parity check matrix to generate parity bits corresponding only to preset columns in the parity check matrix; and a second decoder configured to decode a signal obtained by removing, from the LDM signal, a signal corresponding to the LDPC information word bits generated by decoding the signal transmitted through the first layer, the parity bits generated by the encoder, and the parity bits generated by the first decoder except the parity bits generated by the encoder, thereby to generate information word bits transmitted through a second layer.