UWB Detect-and-Avoid Module for Interference-Free Channel Selection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Ultra wide band (UWB) devices face interference issues when transmitting and receiving radio signals, particularly in the lower band, which limits communication speed and quality due to the need to lower transmit output below −70 dBm/MHz to avoid interference with other devices, restricting the use of frequency hopping in multiband orthogonal frequency division multiplexing (MB-OFDM) communications.
Innovation Solution
A UWB device with a detect-and-avoid (DAA) module that detects signal strength in multiple channels, determines communicability, and generates frequencies for available channels to avoid interference, using a multitone generation block and controller to switch between channels and prevent communication interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the transmit output is lowered below −70 dBm/MHz to avoid interference with other devices, then communication interference is reduced, but communication speed and quality deteriorate
Solution Approach 1:
The patent implements dynamic channel selection by continuously monitoring signal strength in multiple channels and switching to the best available channel. The device dynamically adjusts its operating channel based on real-time interference conditions, allowing it to maintain high transmit output when interference is low while avoiding problematic channels, thus resolving the contradiction between transmit power and interference avoidance
Solution Approach 2:
The patent changes the operating parameter from fixed transmit output to dynamic channel selection. By monitoring signal strength across multiple channels and selecting the optimal channel, the system can maintain higher transmit outputs on interference-free channels while avoiding channels with strong interfering signals, thereby improving communication speed without causing harmful interference
2Adaptability or versatility
If frequency hopping is used in MB-OFDM communications, then communication flexibility is improved, but signal interference with other devices increases
Solution Approach 1:
The patent implements a feedback mechanism where the device continuously monitors signal strength in each channel and uses this information to determine which channels are available for communication. The controller receives feedback about channel conditions and adjusts the selected channel accordingly, enabling flexible communication while avoiding interference by steering clear of channels with strong interfering signals
Solution Approach 2:
The patent performs preliminary channel assessment before initiating communication by detecting signal strength in multiple channels and determining communicability in advance. This preliminary action allows the system to pre-select optimal channels and avoid potential interference issues before actual communication begins, maintaining flexibility while preventing signal interference
3Quantity of substance
If the lower band is used for UWB communications, then bandwidth availability is improved, but interference with existing wireless services increases
Solution Approach 1:
The patent segments the UWB frequency band into multiple channels and uses a detect-and-avoid mechanism to identify which segments (channels) are available for communication. By dividing the bandwidth into discrete channels and selectively using only interference-free segments, the system can utilize available bandwidth while avoiding interference with existing wireless services operating in the lower band
Solution Approach 2:
The patent introduces an intermediary detection mechanism that monitors signal strength in each channel before communication begins. This intermediary layer of detection and avoidance allows the system to mediate between the desire to use the lower band for high-bandwidth communication and the need to avoid interfering with existing wireless services, enabling selective channel usage based on real-time conditions
Data Source
AI summary
An ultra wide band (UWB) device and a detect and avoid (DAA) method thereof are provided. The UWB device includes a detect and avoid (DAA) module block which detects a strength of radio signals received in a plurality of channels and determines communicability of the channels; a multitone generation block which generates a plurality of frequencies corresponding to the plurality of the channels and outputs one of the plurality of frequencies; and a controller which controls the multitone generation block to generate frequencies of an available channel which is determined to be communicable by the DAA module block. The method includes detecting a strength of radio signals received in a plurality of channels; determining communicability of the channels according to the detected strength of the radio signals; generating frequencies corresponding to a channel which is determined to be communicable; and transmitting or receiving a signal using the generated frequencies.