Digital Broadcasting Receiver Power Control via Burst Prediction
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Solution Overview
Problem
Digital broadcasting systems for mobile terminals face challenges in maintaining continuous service reception due to high power consumption and service interruption during low carrier/noise ratio conditions, as they require continuous power for synchronization recovery and cannot receive partial frequency segments efficiently.
Innovation Solution
A digital broadcasting system that generates a broadcast stream with hierarchical coding and multiplexing, allowing for selective data burst reception using prediction windows and error correction, reducing power consumption and preventing service interruptions by decoding lower layer codes even during synchronization loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiver receives all frequency bands of the broadcast wave in series, then the broadcast service can be received at the mobile terminal, but the battery is drained quickly
Solution Approach 1:
The broadcast signal is divided into multiple frequency segments that are transmitted in time-division multiplexed manner. The mobile terminal receives only the necessary segments for the selected service rather than all frequency bands, significantly reducing power consumption while maintaining service reception capability
Solution Approach 2:
The system enables partial reception of frequency segments according to service requirements. The receiver can selectively receive only the segments needed for a particular service (e.g., service A) without receiving unnecessary segments from other services, optimizing the balance between reception reliability and power consumption
2Loss of energy
If the high frequency front end module is powered off during periods of arrival of data bursts of other services, then average power consumption is reduced, but the receiver cannot obtain data bursts normally after synchronization loss in low C/N conditions
Solution Approach 1:
The receiver predicts the timing of data bursts based on synchronization information and opens the high frequency front end module in advance during the predicted time window. This preliminary action ensures the module is ready to receive the data burst even if synchronization is lost, while still limiting power consumption to only the necessary time period
Solution Approach 2:
The system uses synchronization status feedback to adjust the power supply timing. When synchronization is detected, the receiver predicts future data burst timings and powers on the module accordingly. If synchronization is lost, the feedback mechanism allows the receiver to extend the power on period to capture the data burst, ensuring reliable reception
3Reliability
If the tuning/demodulation unit is powered on continuously for recovery of synchronization, then synchronization can be recovered, but much power is consumed
Solution Approach 1:
The receiver predicts when data bursts will arrive based on synchronization timing information and opens the tuning/demodulation unit in advance during the predicted time window. This preliminary opening reduces the need for continuous power supply while ensuring the unit is ready for synchronization recovery when needed
Solution Approach 2:
Instead of continuous power supply, the system uses periodic power supply aligned with predicted data burst arrivals. The tuning/demodulation unit is powered on during predicted time windows when data bursts are expected, achieving synchronization recovery without continuous power consumption
Data Source
AI summary
A digital broadcasting system transmitting and receiving a broadcast stream created from a broadcast source. The system includes a hierarchical coding unit (2) coding the broadcast source depending on a characteristic of the broadcast source and generating, from the coded broadcast source, a first layer code and a second layer code which can respectively be used for reproduction of the broadcast source and includes a synthesis unit (5) generating data bursts, each including the generated first and second layer code. The system also includes a multiplexing unit (7) creating the broadcast stream by multiplexing the generated data bursts, a transmission unit (9) transmitting the created broadcast stream to the network, a tuning/demodulation unit (301) receiving the transmitted broadcast stream, a synchronization unit (302) extracting, from the received broadcast stream, at least one of the first layer code and the second layer codes and a TS decoder (303) reproducing the broadcast source using the extracted code.