OFDM Reception Apparatus Synchronizing Common and Data PLP
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Solution Overview
Problem
In DVB-T.2 systems, establishing synchronism between Common PLP and Data PLP is challenging due to variable T2 frames, necessitating a method to detect and correct frame indices and insertion distances for reliable packet sequence synchronization.
Innovation Solution
A reception apparatus and method that includes acquisition and detection means to specify frame combinations based on demodulated OFDM signals, using specification information for frame numbers and insertion distances, and correction means to adjust frame indices and handle differing frame lengths and structures, ensuring synchronism between Common PLP and Data PLP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If variable T2 frames are used in Common PLP and Data PLP, then the system flexibility and adaptability are improved, but the difficulty of establishing synchronism between packet sequences increases
Solution Approach 1:
The patent applies preliminary action by inserting synchronization packets at predetermined positions in both Common PLP and Data PLP before transmission. These synchronization packets contain frame count information and insertion distance information that are prepared in advance, allowing the reception apparatus to detect and establish synchronism without complex real-time analysis of variable frame structures.
Solution Approach 2:
The patent uses synchronization packets as an intermediary element between Common PLP and Data PLP. These packets serve as reference markers that mediate the synchronism establishment process by providing measurable reference points (frame counts and insertion distances) that bridge the variable frame structures of the two packet sequences.
2Device complexity
If frame indices and insertion distances are not properly synchronized, then the complexity of the reception process is reduced, but the reliability of packet sequence reconstruction deteriorates
Solution Approach 1:
The patent implements feedback by having the reception apparatus detect frame count information and insertion distance information from synchronization packets, compare these with received Common PLP and Data PLP frames, and adjust the frame combination accordingly. This feedback mechanism ensures reliable synchronization while maintaining relatively simple reception processing through automated detection and correction.
3Productivity
If synchronization detection methods are simplified, then the operation efficiency of the receiver is improved, but the precision of synchronism establishment deteriorates
Solution Approach 1:
The patent changes the measurement parameters by using frame count information and insertion distance information as quantifiable metrics instead of attempting to analyze complex variable frame structures directly. This parameter transformation enables precise synchronism detection through simple counting and comparison operations, achieving both high efficiency and high precision in the reception process.
Data Source
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AI summary
Disclosed herein is a reception apparatus, including: a reception section adapted to receive an OFDM (Orthogonal Frequency Division Multiplexing) signal obtained by modulating a first frame configured so as to include packets of a common packet sequence configured from a packet common to a plurality of streams and a second frame configured so as to include packets of a data packet sequence configured from packets individually unique to the plural streams; an acquisition section (12) adapted to acquire specification information for specifying a combination of a first frame and a second frame obtained by demodulating the received OFDM signal; and a detection section (13) adapted to detect a combination of a packet of the common packet sequence which configures the first frame and a packet of the data packet sequence which configures the second frame, whose combination is specified based on the acquired specification information.