DVB-H Burst Reception Timing for Low-Power Signal Acquisition
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Solution Overview
Problem
DVB-H receivers face high power consumption due to the need for full signal acquisition with every burst reception, as they must wait for and align with super frame boundaries, leading to increased power usage in the RF front-end and baseband signal processor.
Innovation Solution
A method that allows the receiver to skip certain acquisition steps and use delta-t-time information to switch off between bursts, reducing the need for continuous reception and enabling a more accurate standby clock to calculate the next burst's timing, thereby reducing the switch-on time and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiver performs full signal acquisition with every burst reception to ensure proper alignment, then the reliability of signal reception is improved, but the acquisition time and power consumption increase
Solution Approach 1:
The receiver performs full signal acquisition and establishes synchronization only once at the beginning. The acquired synchronization information (frame boundaries, super frame alignment, timing parameters) is stored and reused for subsequent burst receptions, eliminating the need to repeat the acquisition process for each burst.
Solution Approach 2:
The receiver creates a copy of the synchronization state and timing information from the first burst and reuses it for subsequent bursts. This allows the receiver to maintain alignment without performing complete signal acquisition again, significantly reducing acquisition time while preserving reception reliability.
2Manufacturing precision
If the receiver waits for super frame boundary alignment before processing each burst, then the manufacturing precision of data alignment is improved, but the loss of time increases
Solution Approach 1:
The receiver identifies and records the super frame boundary position during the initial acquisition phase. This boundary information is then used as a reference point for aligning subsequent bursts, allowing the receiver to process bursts without waiting for super frame boundaries while maintaining proper MPEG-TS packet alignment.
Solution Approach 2:
The invention uses timing information (delta-t values) and synchronization markers as intermediary elements to bridge the gap between bursts. These intermediaries carry the necessary alignment information from one burst to the next, enabling the receiver to maintain precision without waiting for super frame boundaries.
3Productivity
If the receiver remains on continuously to capture all bursts, then the productivity of data reception is improved, but the power consumption increases
Solution Approach 1:
The receiver operates in periodic bursts, turning on only when a burst is transmitted and turning off between bursts. The standby clock maintains minimal operation to track timing, allowing the receiver to wake up at the correct intervals to capture bursts while consuming minimal power during idle periods.
Solution Approach 2:
The standby clock and timing mechanisms operate autonomously to track burst intervals and wake the receiver at the correct times. This self-service capability eliminates the need for continuous receiver operation, as the system automatically manages its own power states based on the transmitted timing information.
4Use of energy by stationary object
If the receiver switches off between bursts to save power, then the power consumption is reduced, but the acquisition time for the next burst increases
Solution Approach 1:
The receiver performs preliminary synchronization and acquires timing information (delta-t values) during the first burst. This preliminary action enables the receiver to calculate the exact wake-up time for subsequent bursts, minimizing the switch-on time required while ensuring the receiver is ready precisely when needed.
Solution Approach 2:
The invention replaces the mechanical approach of continuous receiver operation or long waiting periods with a clock-based timing system. The standby clock and delta-t timing mechanism provide precise scheduling, allowing the receiver to switch on and off at optimal moments, reducing both power consumption and unnecessary waiting time.
Data Source
AI summary
A method for reception of DVB-H signals wherein a MPEG transport stream is grouped into packets belonging to a certain IP data stream and forming bursts in time slices, the MPEG-TS is modulated into OFDM symbols, these symbols are grouped in frames, the frames themselves are grouped in superframes and symbols, frames and superframes are provided with numbers, whereas a transmitter does not change the transmission parameters (FFT mode, guard interval, code rate, modulation format) between successive bursts and a receiver is notified about a relative time from a first burst to transmission of the next burst and the receiver is switched off between the first and the next burst comprising: accurately calculating the receive time of the next burst from the DVBH delta-t time received in the first burst; setting a wake up timer and powering down the receiver; powering up the receiver for reception of the next burst exactly at the superframe boundary; executing signal acquisition; calculating the symbol number and frame number of the first symbol that contains relevant data to be modulated within the actual superframe; calculation the number of bis to be discarded from the MPEG-TS to align with a boundary of a MPEG-TS-packet; discarding the bits; and starting demodulation at the boundary of the MPEG-TS-packet.