UWB Piconet Interference Mitigation via Structured Collision Patterns
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Solution Overview
Problem
Current communication systems, particularly piconets, face significant interference challenges when operating in close proximity, leading to suboptimal performance and increased symbol collisions, with existing solutions failing to adequately address these issues for simultaneous operation without significant interference.
Innovation Solution
A communication device with a radio front end, ADC, demodulator, and decoder that selectively de-weights symbols based on structured interference patterns, reducing collisions by employing frequency hopping and Orthogonal Frequency Division Multiplexing (OFDM) with a reduced duty cycle, allowing piconets to operate with fewer collisions and maintain high performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple piconets operate in close proximity simultaneously, then network coverage and connectivity are improved, but interference between piconets increases and performance deteriorates
Solution Approach 1:
The patent segments the available spectrum into multiple frequency bands and assigns different bands to different piconets operating in close proximity. This frequency division approach allows multiple piconets to operate simultaneously without mutual interference, resolving the contradiction between network coverage and interference.
Solution Approach 2:
The patent employs periodic frequency hopping where piconets switch between frequency bands in a structured periodic manner. This allows piconets to share the spectrum resource efficiently while maintaining adequate separation to minimize interference, enabling both good coverage and reduced interference.
2Ease of operation
If piconets operate without synchronization, then ease of operation is improved, but symbol collisions increase and reliability decreases
Solution Approach 1:
The patent changes the timing parameters of piconets by assigning different duty cycles and time slot structures to different piconets. This parameter differentiation allows piconets to operate independently without strict synchronization while minimizing symbol collisions, thus maintaining both ease of operation and communication reliability.
3Reliability
If interference compensation is applied to all symbols, then reliability is improved, but use of energy increases
Solution Approach 1:
The patent applies interference compensation selectively rather than universally. By identifying and compensating only for symbols that are likely to experience interference based on the structured interference patterns, the system maintains communication reliability while significantly reducing the energy consumption associated with processing all symbols.
Solution Approach 2:
The patent employs structured interference patterns that allow receiving devices to self-identify interfered symbols without requiring complex coordination with transmitting devices. This self-service approach improves reliability through targeted interference compensation while minimizing the energy and processing resources required.
Data Source
AI summary
UWB (Ultra Wide Band) interference mitigation. A novel solution is presented whereby various piconet operable devices are operated to support a relatively structured interference pattern. The devices operate cooperatively (e.g., within multiple piconets that may be in relatively close proximity) such that undesirable symbol collisions generate relatively structured interference (e.g., a structured interference pattern). A piconet operable device (e.g., a communication transceiver or receiver) operating therein includes intelligence such that it may detect a symbol that has undergone an undesirable symbol collision. Then, after those symbols have been identified, they may be modified appropriately so the overall performance of the piconet may be kept at a high performance level. For example, those symbols having an energy (or power) above a predetermined threshold (such as an expected energy level or a power level) may be appropriately de-weighted.