Broadcast Receiver Redundancy Data Selection for Error-Free Reception
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Solution Overview
Problem
Existing broadcast systems, such as DVB-T2, face challenges in providing error-free reception, especially in mobile scenarios with multipath propagation, fading, and Doppler shifts, due to the lack of feedback channels and redundancy data, leading to poor signal reception at the edge of coverage areas and indoors.
Innovation Solution
A receiver system that utilizes redundancy data from a broadband network to enhance demodulation and decoding, selecting or requesting redundancy data via a broadband system when necessary, and using it to correct errors in channel symbols and codewords, thereby improving reception quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If broadcast systems use traditional redundancy data transmission, then coverage area is increased, but system complexity and latency increase
Solution Approach 1:
The system pre-calculates and stores mutual information values for different redundancy data rates before actual reception. When receiving signals, the receiver can directly query these pre-computed values to determine the optimal redundancy rate, avoiding real-time complex calculations and reducing system latency while maintaining expanded coverage area.
Solution Approach 2:
The receiver autonomously determines the optimal redundancy data rate by comparing received signal quality against pre-stored mutual information thresholds, without requiring external control or complex coordination. This self-service mechanism reduces system complexity by eliminating the need for centralized control while maintaining effective coverage extension.
2Reliability
If additional redundancy data streams are transmitted, then error-free reception is enabled, but transmission bandwidth and cost increase
Solution Approach 1:
The system dynamically adjusts the redundancy data rate based on real-time signal quality assessment. By comparing received signal strength against pre-stored mutual information values, the system selects the minimum necessary redundancy level to achieve error-free reception, avoiding transmission of excessive redundancy data and optimizing bandwidth utilization while maintaining high reliability.
Solution Approach 2:
The system changes the redundancy data rate parameter adaptively based on reception conditions. By pre-calculating mutual information for different redundancy rates and selecting the appropriate rate based on current signal quality, the system achieves error-free reception with minimal bandwidth consumption, avoiding the need for fixed high-rate redundancy transmission.
3Productivity
If real-time determination of optimal redundancy data rate is performed, then transmission efficiency is improved, but calculation complexity increases
Solution Approach 1:
The system pre-calculates and stores mutual information values for various redundancy data rates before actual operation. During real-time transmission, the system only needs to query these pre-computed values and select the matching rate, achieving real-time adaptability without the computational burden of real-time calculations, thus improving transmission efficiency while keeping device complexity low.
Data Source
AI summary
A receiver for receiving data in a broadcast system comprises a broadcast receiver configured to receive, 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 demodulates said channel symbols into codewords and a decoder decodes said codewords into output data words. A redundancy unit selects or requests, if demodulation of a channel symbol and/or decoding of a codeword is erroneous or likely to fail, redundancy data for demodulation of future channel symbols and/or decoding of future codewords via a broadband system and a broadband receiver obtains said redundancy data via said broadband system. Said demodulator and/or said decoder is configured to use the obtained redundancy data to demodulate the respective future channel symbols and to decode the respective future codewords, respectively.