WiFi Radio Adaptation for Co-Located UWB Interference
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Solution Overview
Problem
UWB and WiFi radios co-located in the same frequency spectrum experience interference, leading to degraded WiFi reception sensitivity, packet errors, and throughput disruption due to overlapping and adjacent channel interference.
Innovation Solution
The WiFi radio adjusts its operating bandwidth, power, or modulation coding scheme (MCS) to reduce interference from co-located UWB radios, using a 20 MHz band-stop filter and direct MCS-0 adaptation to maintain reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If WiFi radio operates with wide bandwidth (80 MHz or 160 MHz) in 5 GHz band or up to 320 MHz in 6 GHz band, then WiFi throughput and data rate are improved, but interference from co-located UWB radio increases due to overlapping frequency spectrum
Solution Approach 1:
The WiFi radio dynamically adapts its operating parameters (bandwidth, MCS) based on detected UWB transmission conditions. When UWB interference is detected, the system transitions from static wideband operation to dynamic narrowband operation at 20 MHz, allowing flexible response to changing spectral conditions while maintaining coexistence with UWB radios
Solution Approach 2:
The system changes key operational parameters including reducing bandwidth to 20 MHz and adjusting MCS to MCS-0 when UWB interference is present. These parameter changes allow the WiFi radio to operate in a narrower frequency slice that avoids the bulk of UWB spectral overlap, thereby maintaining communication reliability despite the presence of wideband UWB transmissions
2Stability of the object's composition
If WiFi radio reduces bandwidth and MCS gradually based on long term statistics, then adaptation stability is improved, but response time to UWB interference increases causing packet errors and throughput disruption
Solution Approach 1:
The system performs preliminary detection of UWB transmissions and pre-adapts parameters before significant interference occurs. By detecting UWB presence early and proactively adjusting bandwidth and MCS, the system prevents packet errors rather than reacting after they occur, thereby reducing response time while maintaining stability
Solution Approach 2:
The system implements feedback mechanisms that monitor spectral conditions and immediately adjust WiFi transmission parameters in response to detected UWB interference. This closed-loop feedback enables rapid adaptation (reducing response time) while the continuous monitoring ensures adjustments are appropriate to actual conditions (maintaining stability)
3Power
If WiFi radio transmits at high power (up to 17 dBm/MHz in 5 GHz band or up to 23 dBm/MHz in 6 GHz band), then transmission range and coverage are improved, but interference to UWB reception increases
Solution Approach 1:
The WiFi radio applies different power levels in different spectral regions or time periods based on UWB activity. When UWB transmissions are detected, the WiFi radio locally reduces power in the overlapping frequency regions while potentially maintaining higher power in non-overlapping regions or during periods when UWB is not transmitting, thereby providing targeted interference reduction without sacrificing overall coverage
Data Source
AI summary
A method and system for a WiFi radio and a ultrawide band (UWB) radio to co-exist. A UWB transmission is detected and based on the UWB transmission generating adjacent channel interference to the WiFi radio, a transmit power of the WiFi radio is only reduced and a WiFi signal with the reduced transmit power is transmitted. Based on the UWB transmission generating overlapping frequency interference with the WiFi radio, causing a WiFi signal with the one or more of a reduced transmit power, reduced modulation coding scheme, or reduced operating bandwidth to be transmitted.