Reception Device Synchronization Delay Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In DVB-T2 digital terrestrial broadcasting, the synchronization process for OFDM signals is delayed due to the need to correct carrier frequency errors and decode preamble signals, leading to a 250 ms delay before data demodulation can start, which affects the efficiency of data transmission.
Innovation Solution
A receiving device detects a first preamble signal, accumulates and corrects carrier frequency errors for a second preamble signal, and processes data based on the control information from the second preamble signal, allowing for immediate demodulation of data symbols without waiting for the next frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If carrier frequency error correction and preamble signal decoding are performed before data demodulation, then synchronization accuracy is improved, but data transmission delay increases
Solution Approach 1:
The invention performs carrier frequency error correction and preamble signal decoding operations in advance during the synchronization period, before data demodulation begins. By completing these necessary preprocessing steps beforehand, the system ensures accurate synchronization is established while minimizing the delay impact on subsequent data transmission.
Solution Approach 2:
The reception process is divided into distinct segments: a synchronization period for frequency error correction and preamble decoding, followed by a data transmission period. This segmentation allows the system to dedicate specific time resources to each function, ensuring synchronization accuracy is achieved without unnecessarily extending the overall transmission delay.
2Stability of the object's composition
If the receiving device waits for the next T2 frame to start data demodulation, then synchronization stability is improved, but productivity decreases
Solution Approach 1:
The receiving device performs all necessary synchronization operations including carrier frequency error correction and L1 signaling decoding during the initial synchronization period of the first T2 frame. This preliminary action enables the device to start data demodulation immediately within the same frame rather than waiting for the next frame, thereby maintaining synchronization stability while significantly improving transmission productivity.
Solution Approach 2:
The invention rushes through the synchronization process by efficiently performing frequency error correction and preamble decoding operations as quickly as possible during the synchronization period, allowing the system to transition to data demodulation without unnecessary delays and maximize the utilization of the current T2 frame.
3Measurement precision
If P2 symbols are stored before decoding L1PRE signaling, then decoding accuracy is improved, but loss of time increases
Solution Approach 1:
The receiving device stores P2 symbols in advance during the synchronization period and performs L1PRE signaling decoding immediately after accumulation is complete. This preliminary storage action ensures that all necessary data is available for accurate decoding while minimizing the delay by not waiting for additional frames or extended accumulation periods.
Solution Approach 2:
The system maintains continuous operation by accumulating P2 symbols without interruption and immediately proceeding to decoding once the accumulation is complete. This continuous process eliminates idle time between symbol storage and decoding, ensuring that decoding accuracy is achieved through proper signal accumulation while minimizing the overall synchronization delay.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present technique relates to a receiving device, a receiving method, and a program for realizing a prompt start of data demodulation. A receiving device of one aspect of the present technique includes: a detecting unit that detects a first preamble signal from a frame signal having a frame structure that contains the first preamble signal indicating a frame partition, a second preamble signal containing control information to be used in processing a data signal, and the data signal, the second preamble signal being transmitted after the first preamble signal; an accumulating unit that accumulates the second preamble signal when the first preamble signal is detected; and a processing unit that processes the data signal based on the control information contained in the second preamble signal accumulated in the accumulating unit, the data signal being contained in the same frame as the second preamble signal accumulated in the accumulating unit. The present technique can be applied to a receiving device that receives data transmitted by an OFDM method such as DVB-T2.