Frequency Selective Waveform Filtering for Wireless Interference
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Solution Overview
Problem
Wireless communication systems face challenges in managing interference, particularly in small-coverage base stations with ad-hoc deployments, leading to RF interference issues and restricted association requirements, which affect communication performance.
Innovation Solution
The implementation of an optimal transmit waveform filtering technique at access points to reduce perceived interference, using a selected optimal filter to minimize interference at neighboring access terminals, and the transmission of an overhead channel with this optimized filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If frequency selective transmission with optimal waveform filtering is implemented, then interference reduction is improved, but device complexity increases
Solution Approach 1:
The patent applies dynamics by making the transmit waveform adaptive rather than fixed. The access point dynamically selects from multiple candidate waveforms based on real-time interference conditions and channel state information, allowing the system to optimize performance without requiring a completely complex redesign of the transmission architecture.
Solution Approach 2:
The patent changes the parameter of waveform selection by introducing multiple candidate waveforms with different frequency characteristics. Instead of using a single fixed waveform, the system varies the waveform parameters (frequency selectivity, spectral shape) to optimize interference rejection while maintaining manageable system complexity through a finite set of predefined options.
2Reliability
If multiple candidate waveforms are used for frequency selective transmission, then communication performance is improved, but device complexity increases
Solution Approach 1:
The patent applies partial action by using a limited number of candidate waveforms rather than exhaustively testing all possible waveforms. This provides sufficient performance improvement for practical applications while avoiding the excessive complexity that would arise from considering every possible waveform combination.
Solution Approach 2:
The patent applies preliminary action by pre-defining a set of candidate waveforms before actual transmission occurs. The access point prepares multiple waveform options in advance and selects from these pre-computed options during operation, avoiding the need to compute optimal waveforms in real-time and reducing processing complexity.
3Ease of operation
If ad-hoc deployment of small-coverage base stations is allowed, then ease of operation is improved, but RF interference increases
Solution Approach 1:
The patent applies self-service by enabling the access point to autonomously select optimal waveforms based on its own measurements of interference and channel conditions. The system self-adjusts without requiring centralized coordination or complex manual configuration, maintaining ease of deployment while reducing RF interference through intelligent local decision-making.
Solution Approach 2:
The patent applies feedback by incorporating channel state information and interference measurements into the waveform selection process. The access point continuously monitors the radio environment and adjusts its waveform choices based on real-time feedback, allowing ad-hoc deployed systems to automatically mitigate RF interference without external intervention.
Data Source
AI summary
Interference that occurs during wireless communication may be managed by determination of a selected transmit waveform exhibiting a preferred channel quality. A method, apparatus and medium of communication determine a transmit waveform from among a plurality of allocated waveforms of an unplanned access point to an associated access terminal. The transmit waveform exhibiting a highest channel quality with an associated access terminal over others of the plurality of allocated waveforms is determined. Signals are transmitted according to the transmit waveform from the unplanned access point to the associated access terminal.