Reception Device Compensation Circuit Multipoint Bus Switching
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Solution Overview
Problem
In communication systems using a multipoint bus, signal quality degradation occurs due to differences in transmission path impedance and delay between transmission devices and the reception device, leading to reduced bandwidth when switching transmission devices, as the reception device needs to recalibrate compensation circuits frequently.
Innovation Solution
A reception device with a compensation circuit connected to multiple transmission devices, using pre-stored adjustment values from a recording medium to adjust its operation, eliminating the need for real-time recalibration during transmission device switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the compensation circuit is adjusted in real-time each time the transmission device is switched, then signal quality degradation is prevented, but switching time increases and bandwidth utilization decreases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing optimal adjustment values for the compensation circuit in a lookup table during system initialization or calibration phase. When a transmission device is switched, the reception device simply retrieves the pre-computed adjustment value corresponding to the new transmission device from the lookup table, rather than performing real-time recalibration. This eliminates the time-consuming iterative adjustment process while maintaining signal quality, as the stored values were optimized in advance for each specific transmission device configuration.
2Reliability
If the compensation circuit is adjusted in real-time each time the transmission device is switched, then signal quality degradation is prevented, but bandwidth utilization decreases
Solution Approach 1:
The patent resolves this contradiction by performing the compensation circuit adjustment calculations in advance and storing the results in a lookup table. During data transmission, the reception device only needs to query the pre-computed adjustment value from the lookup table based on the active transmission device identifier, then apply it immediately. This eliminates the need to pause data transmission for recalibration, thereby maintaining high bandwidth utilization while ensuring signal quality through the use of pre-optimized adjustment parameters.
3Device complexity
If multiple transmission devices are connected via a multipoint bus, then the number of transmission lines is reduced, but transmission path impedance and delay differences cause signal quality degradation
Solution Approach 1:
The patent applies local quality by implementing transmission device-specific adjustment values in the lookup table that account for the unique electrical characteristics (impedance, delay) of each transmission device's connection to the multipoint bus. When a particular transmission device is activated, the reception device retrieves the corresponding adjustment value optimized for that specific device's transmission path characteristics. This allows the system to maintain signal quality despite variations in transmission path properties across different devices connected to the shared bus.
Solution Approach 2:
The patent utilizes parameter changes by dynamically modifying the compensation circuit parameters based on the selected transmission device. The lookup table stores pre-determined adjustment values that correspond to different transmission path conditions. When switching between transmission devices, the reception device changes the compensation circuit parameters by selecting the appropriate stored value, thereby adapting to the specific impedance and delay characteristics of the active transmission device's connection to the multipoint bus.
Data Source
AI summary
Provided is a reception device and a communication system. The reception device includes a compensation circuit connected to a transmission line that is connected to each of a plurality of transmission devices. The compensation circuit compensates a plurality of data signals received from the plurality of transmission devices, respectively, in time division. The reception device further includes an adjustment circuit that adjusts operation of the compensation circuit based on a plurality of training signals received from the plurality of transmission devices.