Broadcast Receiver Decoding With Broadband Redundancy Data
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Solution Overview
Problem
Existing broadcast systems face challenges in ensuring error-free reception of data by mobile receivers, especially under adverse conditions such as multipath propagation, fading, and Doppler shifts, due to the lack of feedback channels and signaling in broadcast systems like DVB-T2, which limits the reliability of data demodulation and decoding.
Innovation Solution
A receiver system that utilizes redundancy data from a broadband network to improve demodulation and decoding, specifically using least robust bits or constellation subset identifiers to enhance the reliability of channel symbols and codewords, allowing for error-free reception even in poor signal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If broadcast systems use fixed transmission parameters optimized for stationary receivers, then coverage area and signal stability are improved, but mobile reception reliability deteriorates under multipath propagation and fading effects
Solution Approach 1:
The system dynamically adapts transmission parameters including code rate, modulation scheme, and redundancy data allocation based on channel conditions and receiver type. The broadcast transmitter can switch between different transmission modes to optimize performance for both stationary and mobile receivers under varying channel conditions such as multipath propagation and fading.
Solution Approach 2:
The invention changes key transmission parameters including forward error correction code rate, modulation order, and redundancy data insertion rate according to channel quality and receiver capabilities. By adjusting these parameters, the system maintains reliable reception for mobile devices experiencing Doppler shifts and fading while preserving coverage for stationary receivers.
2Reliability
If redundancy data is transmitted to improve error-free reception under bad conditions, then reception reliability is improved, but transmission bandwidth and data rate are reduced
Solution Approach 1:
The system transmits redundancy data selectively rather than continuously. Redundancy information is inserted at controlled rates based on channel conditions and receiver needs, providing sufficient error correction capability only when required. This partial application of redundancy transmission maintains acceptable data rates while improving reception reliability under adverse conditions.
Solution Approach 2:
Redundancy data is pre-calculated and prepared in advance during the encoding process. The forward error correction codes generate parity bits and redundancy information beforehand, allowing the receiver to reconstruct lost or corrupted data without requiring retransmission. This preliminary preparation of redundancy data improves error-free reception while minimizing impact on transmission efficiency.
3Device complexity
If no feedback channel is used in broadcast systems, then system complexity is reduced, but the ability to adapt to channel conditions and improve reception reliability is limited
Solution Approach 1:
The system uses intermediate signaling mechanisms such as transmission mode indicators, code rate indicators, and redundancy data presence flags embedded in the broadcast stream. These intermediaries convey channel condition information and transmission parameter changes from transmitter to receiver without requiring complex feedback channels, maintaining system simplicity while enabling adaptive reception.
Solution Approach 2:
The receiver performs self-adaptation by detecting transmission parameters and channel conditions locally, then automatically adjusting its demodulation and decoding settings. The system uses built-in intelligence to identify redundancy data patterns, select appropriate decoding algorithms, and optimize reception parameters without external control, reducing overall system complexity while maintaining reliability.
Data Source
AI summary
A receiver for receiving data in a broadcast system includes a broadcast receiver that receives, via the broadcast system, a receiver input data stream including plural channel symbols represented by constellation points in a constellation diagram. A demodulator demodulates the channel symbols into codewords and a decoder decodes the codewords into output data words. A broadband receiver obtains redundancy data via a broadband system, the redundancy data for a channel symbol including one or more least robust bits of the channel symbol or a constellation subset identifier indicating a subset of constellation points including the constellation point representing the channel symbol. The demodulator and/or the decoder is configured to use the redundancy data to demodulate the respective channel symbol and to decode the respective codeword, respectively.