Receive Data Value Assignment for Wireless Collision Mitigation
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Solution Overview
Problem
Wireless communication systems face challenges in mitigating the adverse effects of collisions, particularly in systems without system-wide time or frequency division multiplexing, where low complexity, low cost, and low-power devices are required, and collisions can occur due to clock asynchrony and random time-hopping, leading to data reception degradation.
Innovation Solution
A method where a device defines receive data values during transmission periods, using predefined values, noise levels, or signal levels, and employs hybrid on-off keying and pulse-position modulation schemes to mitigate collisions by specifying data values for affected periods, allowing multiple transmissions during reception, and using slicer-based transceivers to process these values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If system-wide time division multiplexing or frequency division multiplexing is employed to avoid collisions, then collision avoidance is improved, but device complexity increases
Solution Approach 1:
The patent extracts the collision mitigation function from the receive path by defining predetermined data values during transmit intervals, separating the transmit and receive operations' collision handling responsibilities. This allows collision mitigation without requiring system-wide timing synchronization.
Solution Approach 2:
The patent applies preliminary action by pre-defining data values for expected collision periods before collisions occur. The receiver prepares predetermined values in advance for time intervals when transmit/receive collisions are expected, eliminating the need for complex real-time collision detection and resolution mechanisms.
2Reliability
If a device defines receive data values during transmission periods to mitigate collisions, then data reception degradation is reduced, but signal-to-noise ratio requirement increases
Solution Approach 1:
The patent changes the parameter of receive data values by introducing predetermined values that differ from traditional zero-valued erasures. These predetermined values are specifically designed to match expected collision signal characteristics, allowing the receiver to more accurately reconstruct collided signals and maintain better reception quality with minimal SNR penalty.
3Ease of manufacture
If predefined data values are used for receive data during transmit intervals, then implementation simplicity is improved, but data accuracy may deteriorate
Solution Approach 1:
The patent applies local quality by using different data value strategies for different time intervals. During non-collision intervals, the receiver uses actual received signals for high accuracy. During expected collision intervals, the receiver uses predetermined values that are specifically tailored to match collision characteristics, optimizing accuracy for each local condition without requiring complex system-wide coordination.
Data Source
AI summary
Adverse effects associated with collisions in a wireless communication system are mitigated by defining one or more values for receive data. Here, data that is expected to be received during a data transmission may be set to a defined value. In some cases the defined value is a predefined value (e.g., zero or some other value). In some cases the defined value is based on noise and/or signals levels in the system. In some implementations a device may define receive data values for a period of time during which data is expected to be received and during which a transmission occurs. In some aspects a hybrid on-off keying scheme is employed to determine received data values.