Antenna Switching Circuit for Signal Fading Resistance
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Solution Overview
Problem
Existing spatial diversity receiving systems in medical telemetry monitoring face challenges with passive channel switching, leading to communication errors due to transient interference and high costs associated with multiple signal strength indication units.
Innovation Solution
Implement a method and device with a main control circuit that dynamically selects the antenna with stronger signal strength by analyzing RSSI values in real-time, performing channel switching during interframe spaces or after data frame completion, and using a single RSSI unit per channel to minimize interference and reduce system complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single RSSI unit is used for two antenna input channels, then the device complexity and cost are reduced, but the channel switching becomes passive and causes communication errors due to transient interference
Solution Approach 1:
The patent applies preliminary action by performing channel switching during interframe spaces or after data frame completion, rather than during active data transmission. This timing strategy prevents transient interference from affecting communication, as the switching occurs during natural idle periods in the protocol. The main control circuit is designed to detect frame boundaries and execute switching operations at these predetermined safe moments, thereby maintaining reliability while using a single RSSI unit.
2Measurement precision
If two independent RSSI units are provided for two antenna input channels, then real-time signal strength monitoring is achieved, but the device complexity and implementation cost increase significantly
Solution Approach 1:
The patent merges the signal strength monitoring function into a single shared RSSI unit that sequentially measures both antenna channels. The main control circuit orchestrates the switching between channels and coordinates the RSSI measurements, combining what would traditionally require two independent units into one resource. This approach maintains the ability to monitor signal strength for both channels while significantly reducing hardware complexity and cost.
Solution Approach 2:
The single RSSI unit is designed to serve multiple functions by measuring signal strength for both antenna input channels sequentially. The unit is not dedicated to a single channel but is universally applicable to both, with the main control circuit managing the timing and coordination. This multi-functional approach eliminates the need for separate RSSI units while preserving real-time monitoring capability.
3Reliability
If channel switching is performed when signal strength falls below a threshold, then the influence of signal fading is reduced, but communication errors occur due to switching during data frame transfer
Solution Approach 1:
The patent implements periodic action by scheduling channel switching to occur during interframe spaces or after data frame completion, rather than continuously or arbitrarily. This periodic timing strategy aligns switching operations with the natural rhythm of the communication protocol, ensuring that transitions happen during idle periods when no data is being transmitted. This approach maintains fading resistance while eliminating transient interference errors.
Data Source
AI summary
The invention relates to a spatial diversity receiving device and an input channel switching method. The device comprises a main control circuit and at least one receiving channel including a RF selective switch, wherein the circuit controls the switch, so as to select one of the plurality of input signals from the plurality of antennae and send that signal to a receiving module. The module comprises a RSSI unit for outputting a RSSI value and sends the value to the circuit. On basis of a real time analysis to the receiving signal, the circuit selects a predetermined occasion to perform a compulsive switching and dynamically selects the antenna with a stronger signal so that the generation of error code due to transient interference may be reduced. The system exhibits an excellent resistance to wireless signal fading, and has a simple structure as well as a low cost and power consumption.