Incremental Redundancy Reception for Mobile Broadcast Decoding
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Solution Overview
Problem
Existing broadcast systems, such as DVB-T2, are optimized for fixed reception and struggle to ensure error-free data reception for mobile receivers under adverse conditions like multipath propagation and fading, as they lack feedback channels for adaptive error correction.
Innovation Solution
A mobile receiver system that requests and utilizes additional redundancy via a unicast system, combining a basic codeword portion with an auxiliary codeword portion generated using a second code, allowing for improved decoding even in poor reception conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If broadcast systems use fixed reception optimization with standard error correction codes, then system complexity remains manageable, but reliability of data reception deteriorates under mobile reception conditions with multipath propagation and fading
Solution Approach 1:
The error correction capability is segmented into two distinct parts: a basic error correction code transmitted with every broadcast data packet, and an additional incremental redundancy code that can be requested separately via unicast channel. This segmentation allows the system to provide basic reliability through the broadcast channel while offering enhanced reliability on-demand through the unicast channel, resolving the contradiction between maintaining simple broadcast transmission and improving mobile reception reliability.
Solution Approach 2:
The system implements dynamic error correction by allowing receivers to adaptively request additional redundancy based on their reception conditions. Mobile receivers experiencing poor signal quality can dynamically request incremental redundancy through the unicast channel, while fixed receivers with good signal quality can rely solely on the basic broadcast transmission. This dynamic adaptation resolves the contradiction by making error correction capability flexible rather than static.
2Reliability
If broadcast systems transmit additional redundancy information for every data packet, then reliability of mobile reception improves, but transmission bandwidth consumption and system complexity increase
Solution Approach 1:
Instead of transmitting full redundancy information with every broadcast packet, the system transmits only the basic minimum error correction code necessary for standard reception. Additional redundancy information is transmitted partially and only when specifically requested by mobile receivers experiencing poor signal conditions. This partial action approach provides sufficient reliability improvement for mobile reception without the excessive bandwidth consumption of always transmitting full redundancy.
Solution Approach 2:
The system implements a self-service mechanism where receivers that experience poor reception conditions autonomously request additional redundancy information through the unicast channel. Rather than the transmitter proactively sending redundant data to all receivers (which would waste bandwidth), each receiver serves its own need by requesting incremental redundancy only when necessary. This resolves the contradiction between improving reliability and reducing transmitted data volume.
3Adaptability or versatility
If broadcast systems implement feedback channels for adaptive retransmission, then adaptability to reception conditions improves, but device complexity and loss of time due to feedback processing increase
Solution Approach 1:
The system introduces a unicast channel as an intermediary mechanism between the broadcast transmitter and mobile receivers. This unicast channel serves as a efficient feedback path where receivers can quickly report reception failures and request additional redundancy without requiring a complex general feedback infrastructure. The unicast intermediary resolves the contradiction by providing adaptability through targeted feedback while minimizing time loss compared to implementing comprehensive feedback channels across the entire broadcast system.
Data Source
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AI summary
The present invention relates to a receiver (50) for receiving data in a broadcast system, comprising: - a broadcast receiver unit (52) for receiving from said broadcast system a receiver input data stream (O') segmented into frames, wherein basic codeword portions (B) of codewords (Z1) are mapped onto said frames, a codeword comprising said at least a basic codeword portion (B) generated from an input data word (D) according to a first code, - a data demapper (54) for demapping the basic codeword portions (B) from said frames of the receiver input data stream (O'), - a decoder (56) for error correction code decoding said codewords into output data words (D') of at least one output data stream (I1', I2',..., In') in a regular decoding step by use of the basic codeword portion (B') comprised in a codeword, - a check unit (58) for checking if the regular decoding of a codeword is erroneous, - a unicast request unit (64) for requesting, if said regular decoding of a codeword is erroneous, through a unicast system an auxiliary codeword portion (A) of the erroneously decoded codeword for use as incremental redundancy in an additional decoding step, - a unicast receiver unit (68) for receiving from said unicast system an auxiliary codeword portion (A') of the erroneously decoded codeword, wherein said decoder (56) is adapted to decode the respective codeword again in an additional decoding step by additionally using the received auxiliary codeword portion (A'), and - a data output (60) for outputting said at least one receiver output data stream (I1', I2',..., In') segmented into said decoded output data words (D').