Digital Broadband Receiver Scaling Module for Wideband Noise Interference
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Solution Overview
Problem
Interference between digital broadband broadcasting and cellular communication systems, particularly due to wideband noise from TDMA-based cellular transmitters, causes disruptions in digital broadband broadcast reception, as frequency bands often overlap, leading to desensitization and blocking effects.
Innovation Solution
A digital broadband broadcast receiver with a scaling module that uses a non-linear scaling function to adjust the reliability of received bits based on interfering transmission burst state information and channel state information, spreading noise energy across OFDM symbols and accounting for cellular wideband noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a filter is made steep enough to filter wideband noise in the DVB-H receiver, then interference from cellular transmission is reduced, but the wanted cellular transmission signal is also blocked due to the short transition band
Solution Approach 1:
The patent introduces an intermediary mechanism (block periods) between the cellular transmission and DVB-H reception. During block periods, cellular transmission is temporarily suspended to allow DVB-H reception without interference. This mediator approach resolves the contradiction by preventing simultaneous operation that causes both interference and signal blocking.
Solution Approach 2:
The patent implements periodic block periods where cellular transmission is interrupted at regular intervals to allow DVB-H reception. This periodic action creates time windows where interference is eliminated, resolving the contradiction between filtering noise and preserving wanted signals by separating their operation in time rather than frequency.
2Object-affected harmful factors
If block periods are used to prevent cellular transmission during DVB-H reception, then interference is avoided, but the quality of cellular signal in services like voice calls deteriorates
Solution Approach 1:
The patent changes the parameters of block periods (duration, frequency, timing) to optimize the balance between reducing DVB-H interference and maintaining cellular service quality. By adjusting these parameters, the system can minimize impact on voice calls while still providing adequate protection for DVB-H reception.
Solution Approach 2:
The patent makes the block period configuration dynamic rather than fixed, allowing adaptation to different service requirements. The system can adjust block period characteristics based on current cellular traffic conditions and service priorities, resolving the contradiction by making the solution flexible rather than static.
3Productivity
If the frequency bands for cellular and DVB-H services are allocated close to each other or overlapping, then spectrum utilization is improved, but mutual interference between the services increases
Solution Approach 1:
The patent uses periodic block periods to separate cellular and DVB-H operations in time, allowing their frequency bands to overlap or be adjacent without causing continuous interference. This temporal separation enables high spectrum utilization while preventing harmful interactions between the services.
Solution Approach 2:
The patent implements preliminary scheduling of block periods to proactively prevent interference before it occurs. By planning and executing block periods in advance based on predicted traffic patterns and service requirements, the system maintains high spectrum efficiency while preemptively avoiding interference scenarios.
Data Source
AI summary
A digital broadband broadcast receiver is configured to receive bits transmitted in transmission symbols, such as orthogonal frequency division multiplexing (OFDM) symbols. The reliability of the received bits is scaled with a non-linear scaling function which is in relation to the amount of interfered part of a received transmission symbol. In the scaling, a burst state information (BSI) and/or channel state information (CSI) method can be used.