Broadcast Receiver Redundancy Requests for Error-Prone Mobile Reception
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Solution Overview
Problem
Existing broadcast systems face challenges in ensuring error-free reception of data by mobile receivers, especially under poor reception conditions such as multipath propagation, fading, and Doppler shifts, due to the lack of feedback channels and signaling in broadcast systems like DVB-T2, leading to increased costs and inefficiencies in transmitting redundancy data.
Innovation Solution
A receiver and broadband server system that dynamically requests and provides redundancy data via a broadband network, using techniques like Redundancy on Demand (RoD), where the receiver determines the required amount of redundancy data based on channel state information and uses it for demodulation and decoding, optimizing the amount of data transmitted to ensure error-free reception without excessive redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundancy data is transmitted to ensure error-free reception under poor reception conditions, then reliability of data reception is improved, but loss of energy and transmission costs increase
Solution Approach 1:
The system dynamically adapts the transmission of redundancy data based on real-time channel conditions. The broadcast transmitter transmits redundancy data only when reception conditions deteriorate below a threshold, making the redundancy transmission dynamic rather than static. This resolves the contradiction by transmitting redundancy selectively - improving reliability only when needed - thereby reducing unnecessary energy consumption during good reception conditions.
Solution Approach 2:
The system changes the parameter of redundancy data transmission based on channel quality metrics. When channel conditions are poor (low signal-to-noise ratio, high error rates), the system increases redundancy transmission; when conditions are good, it reduces or eliminates redundancy transmission. This parameter-based adaptation resolves the contradiction between ensuring error-free reception and minimizing energy loss.
2Reliability
If redundancy data is transmitted to correct decoding errors, then reliability of data reception is improved, but quantity of transmitted data increases
Solution Approach 1:
The system dynamically controls the quantity of redundancy data transmitted based on actual reception conditions. Instead of transmitting fixed amounts of redundancy data continuously, the system monitors channel quality and activates redundancy transmission only when decoding errors are detected or predicted. This dynamic approach improves reliability while minimizing the quantity of transmitted data.
Solution Approach 2:
The system extracts and transmits only the necessary portion of redundancy data required to correct specific decoding errors. Rather than transmitting complete redundancy copies regardless of need, the system identifies which redundancy data is actually required based on error patterns and channel conditions, transmitting only that specific portion. This extracts the essential redundancy needed while reducing overall data volume.
3Device complexity
If fixed transmission parameters are used for broadcast systems, then device complexity is reduced, but adaptability to different reception conditions deteriorates
Solution Approach 1:
The system introduces feedback mechanisms where reception conditions are monitored and used to control redundancy data transmission. The broadcast transmitter receives information about reception quality (through feedback channels or by monitoring transmission parameters) and adjusts redundancy transmission accordingly. This feedback loop enables adaptability to different reception conditions while maintaining relatively simple device complexity by using standardized feedback protocols.
Data Source
AI summary
A receiver for receiving data in a broadcast system comprises a broadcast receiver that receives via said broadcast system a receiver input data stream comprising a plurality of channel symbols represented by constellation points in a constellation diagram, a demodulator that demodulates said channel symbols into codewords, and a decoder that decodes said codewords into output data words. A redundancy calculator determines a required amount of redundancy data required for correct demodulation and decoding by use of the originally received channel symbol and additional redundancy data. A broadband request unit requests, if demodulation of a channel symbol and/or decoding of a codeword is erroneous or likely to fail, a required amount of redundancy data via a broadband system, that is received by a broadband receiver via said broadband system. Said demodulator and/or said decoder is configured to use said redundancy data for demodulation and decoding, respectively.