DVB-H Time Deinterleaving for Cellular Interference Mitigation
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Solution Overview
Problem
Interference between digital broadband broadcasting and cellular communication systems, particularly in terminals supporting both services, due to overlapping frequency bands, causes disruptions in digital broadband broadcast reception, and existing solutions like filtering or block periods lead to irrecoverable signal quality damages.
Innovation Solution
Implementing a time deinterleaver in digital broadband broadcast receivers and a time interleaver in transmitters to spread interfering noise across multiple OFDM symbols, using stronger error correction codes when interference is detected, and applying reliability scaling to mitigate interference effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If filtering is applied in the cellular transceiver to reduce broadband noise, then interference to digital broadband broadcast reception is reduced, but cellular signal quality deteriorates due to insufficient filter performance
Solution Approach 1:
The patent introduces an intermediary mechanism (time deinterleaver and error correction coding) between the interfering cellular signal and the digital broadband broadcast reception. Instead of directly filtering the cellular signal, the system uses time deinterleaving to spread interference across multiple OFDM symbols and employs error correction codes to recover from the distributed interference, thereby protecting broadcast reception without compromising cellular signal quality
Solution Approach 2:
The patent changes the temporal distribution parameter of the cellular signal by applying time deinterleaving. This transforms concentrated interference into distributed interference across multiple time slots, making it manageable through error correction mechanisms while maintaining cellular communication reliability
2Object-affected harmful factors
If block periods are used to block cellular transmission during digital broadband broadcast reception, then interference is avoided, but cellular service quality deteriorates due to signal blockage
Solution Approach 1:
The patent segments the cellular transmission into time-interleaved slots, allowing selective transmission during digital broadband broadcast reception. Instead of blocking entire transmission periods, the system divides cellular traffic into segments that can be transmitted in non-conflicting time slots, maintaining cellular service continuity while protecting broadcast reception
Solution Approach 2:
The patent implements dynamic resource allocation where cellular transmission parameters are adjusted based on digital broadband broadcast reception requirements. The system dynamically switches between transmission modes using time deinterleaving and error correction, adapting to varying interference conditions without permanent service degradation
3Object-affected harmful factors
If steep filters are designed to separate cellular and broadcast frequencies, then interference is reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent replaces the mechanical/filter-based interference separation approach with a signal processing-based solution. Instead of relying on physical filters to separate frequencies, the system uses time deinterleaving and error correction coding to handle interference in the digital domain, significantly reducing hardware complexity and manufacturing difficulties
Data Source
AI summary
In a digital broadband broadcast transmitter, digital data is time interleaved for transmission, and the time interleaved digital data is transmitted in a digital broadband broadcast transmission towards a plurality of receivers. A cellular transmitter is operated in an apparatus. In the same apparatus, the digital broadband broadcast transmission transmitted by the digital broadband broadcast transmitter is received, and the received digital broadband broadcast transmission is time deinterleaved.