Transmitter Pilot Insertion for Synchronization Precision
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Solution Overview
Problem
In digital broadcasting, especially for high-definition and mobile devices, existing systems face challenges in maintaining precise synchronization, particularly in poor channel environments, due to insufficient pilot signals, which affects performance and robustness.
Innovation Solution
Increasing the number of pilots inserted into frames, with specific patterns for preamble and data symbols, and adjusting their positions based on FFT sizes, to enhance synchronization performance without overlapping with scattered pilots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pilots is increased to improve synchronization performance, then synchronization precision is improved, but the frame structure becomes more complex
Solution Approach 1:
The patent divides pilots into two distinct types: first pilots inserted in preamble symbols and second pilots inserted in data symbols. Each type has specific insertion patterns and purposes, allowing the system to achieve high synchronization precision through structured segmentation rather than uniformly distributing all pilots throughout the frame.
Solution Approach 2:
The patent applies different pilot insertion strategies to different parts of the frame. First pilots are inserted in preamble symbols at specific positions, while second pilots are inserted in data symbols based on FFT size (90 for 8K, 180 for 16K, or 360 for 32K). This localized approach optimizes synchronization performance in each region without unnecessarily complicating the entire frame structure.
2Reliability
If more pilots are inserted to maintain synchronization in poor channel environments, then reliability is improved, but the amount of data that can be transmitted decreases
Solution Approach 1:
The patent uses partial action by inserting pilots only at specific positions and frequencies rather than throughout the entire frame. The number of second pilots is determined based on FFT size, using a proportional approach that provides sufficient pilots for reliable synchronization while minimizing impact on data capacity. For example, 90 second pilots for 8K FFT, 180 for 16K FFT, and 360 for 32K FFT.
Solution Approach 2:
The patent dynamically adjusts pilot insertion parameters based on FFT size. The number of second pilots varies (90, 180, or 360) depending on whether 8K, 16K, or 32K FFT is used, allowing the system to optimize the balance between synchronization reliability and data capacity for different transmission scenarios.
3Ease of operation
If pilots are inserted according to fixed patterns to simplify processing, then ease of operation is improved, but adaptability to different FFT sizes decreases
Solution Approach 1:
The patent implements dynamic adaptability through a lookup table approach where the pilot inserter stores predetermined insertion patterns for different FFT sizes (8K, 16K, 32K). When the FFT size changes, the system simply retrieves the appropriate pattern from storage rather than recalculating, maintaining ease of operation while achieving versatility across different configurations.
Solution Approach 2:
The patent prepares multiple pilot insertion patterns in advance and stores them in a lookup table. The pilot inserter retrieves the appropriate pattern based on the current FFT size, eliminating the need for real-time calculations and simplifying the processing while adapting to different FFT configurations.
Data Source
AI summary
A transmitter includes a frame generator which generates a plurality of frames each of which includes a preamble symbol and a data symbol, a pilot inserter which inserts a plurality of first pilots in the preamble symbol according to a predetermined first arrangement pattern and inserts a plurality of second pilots in a data symbol according to a second arrangement pattern, and a transmitting unit which transmits the plurality of frames in which the first and second pilots are inserted. Accordingly, a memory needed to store pilots may be reduced and precise synchronization may be performed based on an extended number of pilots.