Hierarchical Broadcast Decoding With Single LDPC FEC
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Solution Overview
Problem
The hierarchical modulation and demodulation system requires complex structures and increased power consumption due to the need for separate forward error correctors (FEC) for high and low resolution signals, complicating the reception process in mobile devices.
Innovation Solution
A digital transmitting and receiving apparatus that simplifies the reception structure by using a single decoder to selectively receive data based on reception conditions, employing a first and second coder with low-density parity-check (LDPC) codes, and a modulator to combine and demodulate data with added parities, allowing for adaptive decoding of layer data according to reception conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hierarchical modulation and demodulation is used to provide both high and low resolution signals, then transmission resolution and reception quality are improved, but device complexity and power consumption increase due to requiring separate FEC decoders for each resolution
Solution Approach 1:
The patent merges the decoding functions for both high and low resolution signals into a single FEC decoder. The transmitter encodes both resolution signals using the same FEC scheme, and the receiver uses one decoder to decode either high or low resolution signals based on reception conditions, eliminating the need for separate decoders and reducing device complexity while maintaining adaptability
Solution Approach 2:
The single FEC decoder is designed to universally handle both high and low resolution signals. The decoder can adaptively decode different resolution signals based on reception conditions, making it a multi-functional component that replaces multiple specialized decoders, thereby reducing device complexity without sacrificing transmission versatility
2Adaptability or versatility
If hierarchical modulation and demodulation is used to provide both high and low resolution signals, then transmission resolution and reception quality are improved, but power consumption increases due to increased algorithms and processing requirements
Solution Approach 1:
By combining the decoding functions into a single FEC decoder, the patent reduces the total computational workload compared to running separate decoders. The single decoder adapts its processing based on reception conditions, reducing power consumption by avoiding redundant decoding operations while maintaining the ability to handle both high and low resolution signals
3Measurement precision
If separate FEC decoders are employed for high and low resolution signals, then decoding accuracy is improved, but device complexity increases
Solution Approach 1:
The patent uses parameter changes within a single FEC decoder to achieve decoding accuracy comparable to separate decoders. The decoder adapts its decoding parameters and algorithms based on the input signal type (high or low resolution) and reception conditions, maintaining decoding precision while avoiding the complexity of multiple dedicated decoders
Data Source
AI summary
A digital transmitting apparatus may include a first coder which codes a first layer data to add a first parity, a multiplexer which adds a second layer data to the first layer data to which the first parity is added, a second coder which codes the data outputted from the multiplexer to add a second parity, and a modulator which modulates the data to which the second parity is added and outputs the resultant data.