DVB Receiver Signal Acquisition Using Pre-Estimated Frame Parameters
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Solution Overview
Problem
Mobile devices receiving DVB signals face challenges in quickly acquiring the necessary information due to intermittent and frequency-hopping signals, leading to reduced image quality and increased power consumption, especially when only one tuner is available and signal parameters change between frames.
Innovation Solution
Implementing a method where a receiver initializes signal parameter estimation based on the preceding DVB-T2 signal to reduce the time required to acquire DVB-NGH signals by pre-estimating parameters such as signal power and frequency offsets, and storing these estimates to facilitate faster re-acquisition during interleaved transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a mobile device uses only one tuner to receive DVB signals, then cost is reduced, but signal acquisition time increases and image quality deteriorates
Solution Approach 1:
The patent applies preliminary action by performing signal parameter estimation on DVB-T2 signals before the actual DVB-NGH signal transmission begins. The receiver estimates parameters such as frequency offset, timing offset, and channel impulse response from the preceding DVB-T2 frame, so that when the DVB-NGH signal arrives, the receiver is already prepared with initial parameter values, significantly reducing acquisition time despite using only one tuner
Solution Approach 2:
The patent uses the DVB-T2 signal as an intermediary to facilitate faster acquisition of the DVB-NGH signal. By extracting and estimating parameters from the DVB-T2 transmission, the system creates a bridge that provides initial conditions for the subsequent DVB-NGH reception, enabling faster signal acquisition with a single tuner
2Measurement precision
If signal parameters are re-estimated for each intermittent DVB transmission, then acquisition accuracy is improved, but power consumption increases
Solution Approach 1:
The patent performs parameter estimation in advance during the DVB-T2 transmission period, storing these estimates for use during DVB-NGH reception. This preliminary estimation reduces the need for extensive re-estimation during each intermittent transmission, thereby lowering power consumption while maintaining adequate accuracy
Solution Approach 2:
The system recovers and reuses signal parameter estimates from previous DVB-T2 transmissions instead of discarding them. By storing and reapplying these estimates during subsequent DVB-NGH receptions, the system avoids redundant full parameter estimation processes, reducing power consumption while maintaining measurement precision
3Reliability
If signal acquisition is delayed, then robust encoding can be used, but image quality deteriorates due to lost data frame information
Solution Approach 1:
The patent performs preliminary parameter estimation during the DVB-T2 signal transmission, so that when the DVB-NGH signal begins, the receiver already has initial parameter values ready. This reduces the acquisition time required, allowing the receiver to capture the initial information in the DVB-NGH frame before it expires, thereby maintaining both robustness and image quality
Solution Approach 2:
The system rushes through the signal acquisition process by using pre-estimated parameters to quickly lock onto the DVB-NGH signal. This accelerated acquisition allows the receiver to obtain the initial frame information before the data expires, preventing image quality deterioration while maintaining reliable signal capture
Data Source
AI summary
A receiver comprises a first signal acquisition unit for acquiring a first type of signal block formatted according to a first format, where the first signal acquisition unit includes one or more parameter estimation units for estimating from the received signals one or more signal parameters related to acquisition of the first type of signal block. The first type of signal block is interleaved with a second type of signal block formatted according to a second format, and one or more parameter estimation units are arranged to conduct signal parameter estimation based upon one or more respective properties of the received second type of signal block prior to continuation of the estimation based upon one or more respective properties of the received first type of signal block.