Stylus Downlink Reception Windowing to Prevent Symbol Interference
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Solution Overview
Problem
Conventional sensor controllers experience interference between symbols of a downlink signal due to synchronization loss, leading to reception errors.
Innovation Solution
The sensor controller operates with a shortened window time for receiving symbols, preventing interference by pausing reception at symbol boundaries and using a shortened window mode when synchronization is lost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sensor controller uses a window length equal to the symbol time length for demodulation, then the reception process is simple and continuous, but synchronization loss causes interference between adjacent symbols
Solution Approach 1:
The patent applies partial action by using a window length that is only 0.7 to 0.9 times the symbol time length, rather than using the full symbol duration. This shortened window prevents adjacent symbol interference while still capturing sufficient signal energy for reliable demodulation, resolving the contradiction between simple continuous reception and interference prevention.
2Productivity
If the sensor controller continuously receives the downlink signal without interruption, then the reception efficiency is high, but synchronization loss causes symbols from adjacent time slots to interfere with current symbol reception
Solution Approach 1:
The patent implements partial reception by configuring the window length to be shorter than the full symbol duration (0.7-0.9 times symbol time). This allows the system to receive signals efficiently while creating temporal gaps that prevent adjacent symbol interference, thus maintaining high reception efficiency without sacrificing reliability.
3Reliability
If the window length is shortened to prevent symbol interference, then symbol interference is reduced, but the reception time window becomes shorter potentially missing signal components
Solution Approach 1:
The patent optimizes the window length parameter to be within 0.7 to 0.9 times the symbol time length. This parameter adjustment prevents symbol interference while capturing sufficient signal energy, balancing interference prevention with complete signal component capture for accurate demodulation.
Data Source
AI summary
Provided is a sensor controller that receives a downlink signal transmitted by a stylus, by performing an operation of receiving each of a plurality of symbols constituting the downlink signal within a window time having a time length shorter than a time length of a transmission duration of one of the symbols by the stylus.