Receiver Beamforming for Interference Mitigation in P2P Networks
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Solution Overview
Problem
In ad hoc peer-to-peer wireless networks, interference between devices sharing a frequency spectrum is a significant challenge, as existing methods lack effective mechanisms to mitigate interference and optimize communication efficiency.
Innovation Solution
Implementing transmitter and receiver yielding protocols, enhanced by multiple receive antennas, which allow devices to adjust transmission power and beamforming coefficients based on signal-to-interference ratios, enabling better interference management and communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple peer-to-peer connections share a frequency spectrum, then network capacity and connectivity are improved, but interference between transmissions increases
Solution Approach 1:
The patent applies local quality by making each receiver device evaluate interference locally based on its own beamforming capabilities and signal-to-interference ratio measurements. Each device independently determines whether to yield based on its specific reception conditions rather than using a centralized control mechanism, allowing local optimization of interference management.
Solution Approach 2:
The patent changes the parameter of yielding threshold based on beamforming capability. Receivers with better beamforming capabilities (higher signal-to-interference ratios) are assigned lower yielding thresholds, allowing them to operate more aggressively. This dynamic parameter adjustment resolves the contradiction by adapting interference tolerance to actual receiver capabilities.
2Reliability
If receiver yielding is implemented to reduce interference, then communication quality for other connections is improved, but network utilization and productivity decrease
Solution Approach 1:
The patent dynamically adjusts the yielding threshold parameter based on each receiver's beamforming capability and measured signal-to-interference ratio. Instead of using a fixed conservative threshold that would reduce network utilization, the system allows receivers with superior beamforming capabilities to use lower thresholds, thereby maintaining higher network utilization while still protecting communication quality for vulnerable connections.
Solution Approach 2:
The patent introduces dynamics by making the yielding decision adaptive rather than static. Receivers continuously measure signal-to-interference ratios and adjust their yielding behavior accordingly. This dynamic approach allows the network to optimize both communication quality and utilization based on real-time conditions, rather than sacrificing utilization for guaranteed quality.
3Reliability
If devices transmit at higher power to improve signal strength, then communication reliability is improved, but interference to other connections increases
Solution Approach 1:
The patent implements feedback mechanisms where receiver devices measure signal-to-interference ratios and communicate this information back to transmitters. Based on this feedback, transmitters can adjust their transmit power dynamically. This feedback loop resolves the contradiction by allowing high power transmission only when it does not create excessive interference, as detected by the receiver's beamforming capability and SIR measurements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solution effectively reduces interference by allowing devices to dynamically adjust their transmission strategies, improving communication quality and overall network performance by prioritizing higher-priority connections and optimizing beamforming capabilities.
Implementation Method 1
A plurality of receive beamforming coefficients may be determined as a function of the received first pilot signals in each of the plurality of receive antennas... The second device then calculates a signal-to-interference ratio of the first pilot signal by combining the first pilot signal received from the plurality of receive antennas using the determined plurality of receive beamforming coefficients.
Data Source
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AI summary
To mitigate interference between multiple peer-to-peer devices, transmitter yielding and/or receiver yielding may be performed among devices operating in a peer-to-peer network. Generally, a transmitter device will yield communications on a time slot to a higher priority transmitter device if it will cause unacceptable interference to a higher priority receiver device. Likewise, a receiver device may yield use of the time slot if interference is unacceptably high. Both transmitter and receiver yielding may be improved by use of beamforming at a receiver device. By utilizing beamforming information to make the transmitter and/or receiver yielding decisions, better interference mitigation may be achieved.