WiFi Interference Mitigation via LTE Signal Classification
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Solution Overview
Problem
Interfering signals from LTE and other sources degrade the performance of WiFi data transmissions in the unlicensed 5 GHz frequency band, leading to increased bit error rates, packet drop rates, and decreased data rates.
Innovation Solution
A wireless access point equipped with a software-defined monitor radio detects and classifies interfering signals, allowing it to adjust transmission parameters such as transmission time, data rate, and frequency to minimize interference by coordinating data transmissions with the duty cycles and presence of LTE signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data transmission is performed in the unlicensed 5 GHz frequency band, then data rate and network capacity are improved, but interfering signals from LTE and other sources degrade transmission quality and increase bit error rates
Solution Approach 1:
The system performs preliminary detection and classification of interfering signals before data transmission. The access point uses a monitor radio to detect LTE and other interfering signals, classifies them by type and duty cycle, and prepares transmission strategies in advance. This preliminary action allows the system to anticipate interference patterns and adjust transmission parameters proactively, resolving the contradiction between maintaining high data rates and ensuring transmission reliability in the presence of interferers.
Solution Approach 2:
The system dynamically adjusts transmission parameters based on real-time interference conditions. Transmission power, data rate, and timing are continuously adapted according to the detected interferer characteristics and duty cycles. This dynamic adaptation allows the system to optimize performance by transmitting at higher rates when interference is low and reducing rates or power when interference is detected, thereby resolving the contradiction between productivity and reliability.
2Strength
If transmission power is increased to overcome interference, then signal strength is improved, but interference from other transmissions increases and overall network performance degrades
Solution Approach 1:
The system exploits the periodic duty cycle patterns of LTE interferers by transmitting data during their off-periods. Instead of continuously transmitting at high power, the access point synchronizes transmissions with the interferer's duty cycle, sending data during intervals when LTE is not transmitting. This periodic action allows the system to maintain adequate signal strength during transmission windows while avoiding constant high-power transmission that would interfere with other networks, thus resolving the contradiction between signal strength and harmful interference.
3Object-affected harmful factors
If transmission timing is adjusted to avoid LTE duty cycles, then interference is reduced, but available transmission time decreases and data rate may be impacted
Solution Approach 1:
The system changes multiple transmission parameters simultaneously to compensate for reduced transmission time. When transmitting during LTE off-periods, the access point adjusts data rate, modulation scheme, and coding rate to maintain overall throughput. By dynamically modifying these parameters based on the available transmission window size, the system can achieve adequate data rates even with fragmented transmission opportunities, resolving the contradiction between avoiding interference and maintaining productivity.
Data Source
AI summary
A method for transmitting a data transmission based on the classification of an interfering signal is described. The method comprises transmitting a first data transmission within a frequency band and detecting an interfering signal within the frequency band. The method comprises classifying the interfering signal as one of a plurality of interfering signal types. The method comprises transmitting, based on the classification, a second data transmission within the frequency band.