Broadcast Receiver Incremental Redundancy via Unicast Feedback
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Solution Overview
Problem
Existing broadcast systems, such as DVB-T2, are optimized for fixed reception and struggle to maintain error-free data reception in mobile scenarios due to multipath propagation, fading, and Doppler shifts, especially without feedback channels.
Innovation Solution
A receiver and data transmission system that incorporates incremental redundancy through a unicast system, where a mobile receiver can request auxiliary codeword portions for error correction, enhancing decoding robustness by using both basic and auxiliary codewords.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If broadcast systems use fixed reception optimization, then transmission efficiency is improved, but reception reliability deteriorates under mobile conditions
Solution Approach 1:
The transmitter pre-generates multiple versions of auxiliary codeword portions and stores them before transmission. When a mobile receiver experiences decoding errors, it can request these pre-prepared redundancy versions through the unicast channel, eliminating the need for real-time generation and enabling rapid error correction under mobile conditions
Solution Approach 2:
A unicast system is introduced as an intermediary communication channel between the transmitter and mobile receivers. This intermediary enables request-response communication for auxiliary codeword portions, allowing receivers to obtain additional redundancy information on-demand without disrupting the original broadcast transmission efficiency
2Device complexity
If no feedback channel is provided in broadcast systems, then system complexity is reduced, but error correction capability deteriorates
Solution Approach 1:
The unicast system serves as a feedback mechanism intermediary, enabling receivers to send decoding status information back to the transmitter without requiring a dedicated feedback channel in the broadcast system. This maintains the simplicity of the broadcast system while adding error correction capability through the intermediary unicast communication path
Solution Approach 2:
The system implements feedback through the unicast channel, where receivers can inform the transmitter about decoding errors and request specific auxiliary codeword portions. This feedback loop enables adaptive error correction while maintaining the original broadcast system's simplicity by using the unicast channel for all feedback communication
3Reliability
If incremental redundancy is provided on-demand through unicast, then reception reliability is improved, but device complexity increases
Solution Approach 1:
Multiple versions of auxiliary codeword portions are pre-generated and stored at the transmitter before transmission begins. This preliminary preparation eliminates the need for complex real-time encoding operations, reducing device complexity while maintaining the ability to provide incremental redundancy on-demand to improve reception reliability
Solution Approach 2:
The complex error correction functionality is extracted into a separate unicast communication path, distinct from the main broadcast transmission. This separation allows the broadcast system to remain simple while the unicast system handles the sophisticated incremental redundancy provision, improving reception reliability without significantly increasing overall system complexity
Data Source
AI summary
A receiver includes: a broadcast receiver receiving a receiver input data stream segmented into frames, wherein basic codeword portions of codewords are mapped onto the frames, a codeword including at least a basic codeword portion generated from an input data word according to a first code; a data demapper demapping the basic codeword portions; a decoder error correction code decoding the codewords into output data words of at least one output data stream in a regular decoding using the basic codeword portion in a codeword; a check unit checking if the regular decoding of a codeword is erroneous; a unicast request unit requesting, if the regular decoding of a codeword is erroneous, an auxiliary codeword portion of the erroneously decoded codeword for incremental redundancy in an additional decoding; a unicast receiver unit receiving an auxiliary codeword portion of the erroneously decoded codeword.