Broadcast Receiver Broadband Redundancy for Mobile Decoding Errors
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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, and require excessive redundancy data to maintain error-free decoding.
Innovation Solution
A receiver and broadband server system that dynamically requests and provides redundancy data via a broadband network based on channel state information, using techniques like least significant bits and constellation subset identifiers to optimize redundancy, allowing for efficient error correction without increasing overall data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundancy data is transmitted via broadcast system to ensure error-free reception under bad reception conditions, then the probability of error-free reception is improved, but the amount of data transmission and network resources are increased
Solution Approach 1:
The system dynamically adapts the amount of redundancy data transmitted based on real-time channel conditions. The broadcast system monitors reception quality metrics (such as BER, SNR) and adjusts the redundancy level accordingly - transmitting more redundancy when channel conditions deteriorate and less when conditions are good, thereby optimizing both reliability and data transmission efficiency
Solution Approach 2:
The system changes transmission parameters including code rate, modulation scheme, and redundancy level based on channel state information. By dynamically adjusting these parameters, the system can maintain error-free reception under varying channel conditions without consistently transmitting maximum redundancy data, thus reducing overall data transmission while maintaining reliability
2Reliability
If broadcast system parameters are optimized for fixed reception with stationary receivers, then reception quality for stationary receivers is improved, but mobile receivers suffer from multipath propagation, fading effects and Doppler shifts
Solution Approach 1:
The broadcast system is designed to serve multiple receiver types (stationary and mobile) simultaneously through a single transmission infrastructure. By incorporating universal features such as robust synchronization signals, flexible frame structures, and adaptive redundancy mechanisms that work for both fixed and mobile receivers, the system achieves multi-functionality without requiring separate optimized systems
Solution Approach 2:
The system dynamically adapts to different receiver conditions by implementing mobile-optimized features such as frequency offset compensation, timing synchronization adjustments, and adaptive redundancy insertion that respond to Doppler shifts and multipath effects. These dynamic adjustments allow the same broadcast signal to maintain quality for both stationary and mobile receivers
3Reliability
If excessive redundancy data is transmitted to maintain error-free decoding under all conditions, then decoding reliability is improved, but transmission costs and energy consumption are increased
Solution Approach 1:
The system applies partial redundancy transmission by sending only the necessary amount of redundancy data required for error-free decoding under current channel conditions, rather than transmitting excessive redundancy unconditionally. This selective approach ensures decoding reliability is maintained while avoiding the energy waste associated with transmitting unnecessary redundancy data during good reception conditions
Solution Approach 2:
The system implements feedback mechanisms where receivers report channel quality metrics and decoding status to transmitters. Based on this feedback, transmitters dynamically adjust the redundancy level - transmitting more redundancy only when decoding failures are detected or predicted, thereby maintaining high decoding reliability while minimizing energy consumption associated with redundancy transmission
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 that demodulates the channel symbols into codewords, and a decoder that decodes the 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. The demodulator and/or the decoder is configured to use the redundancy data for demodulation and decoding, respectively.