TVWS Wireless System Channel Segmentation and Adaptive Modulation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently utilizing television white space (TVWS) channels for multi-channel signaling, particularly in ensuring non-interfering operations with broadcast television and varying spectral mask requirements across different countries, which affects the reliability and compatibility of wireless local area networks (WLANs) like IEEE 802.11af.
Innovation Solution
The implementation of a wireless communication system that supports contiguous and non-contiguous channel operations within TVWS, using OFDM modulation and adaptive modulation coding sets (MCS) for each channel, along with a modified signal field structure to ensure optimal channel utilization and interference minimization, allowing for flexible channel bandwidths and power spectral density management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-channel signaling is implemented in TVWS, then channel utilization efficiency is improved, but interference with broadcast television and compliance with spectral mask requirements becomes more difficult to manage
Solution Approach 1:
The patent segments the available TVWS spectrum into multiple discrete channels (e.g., 6 MHz, 8 MHz, or 20 MHz channels) that can be independently selected and utilized. This segmentation allows the wireless communication system to operate on specific non-contiguous or contiguous channels while avoiding frequencies used by broadcast television, thereby improving channel utilization efficiency without causing harmful interference.
Solution Approach 2:
The patent applies different spectral mask requirements and power spectral density limits to different channel configurations and geographic regions. By adjusting transmission parameters locally based on regulatory standards and detected TV broadcast presence, the system optimizes channel utilization while ensuring compliance with regional spectral mask requirements and avoiding interference with broadcast television.
2Productivity
If adaptive modulation coding sets (MCS) are used for each channel, then network performance is improved, but system complexity increases
Solution Approach 1:
The patent implements adaptive modulation coding sets (MCS) that dynamically adjust modulation order and coding rate based on channel conditions, signal quality, and regulatory constraints for each individual channel. This dynamic adaptation optimizes network performance by selecting the most efficient MCS configuration for current operating conditions while the patent manages complexity through standardized MCS tables and automated selection algorithms.
3Adaptability or versatility
If contiguous and non-contiguous channel operations are supported, then spectral flexibility is improved, but compatibility with varying regulatory standards becomes more challenging
Solution Approach 1:
The patent designs a universal wireless communication system capable of operating in both contiguous and non-contiguous channel modes across different regulatory domains. The system incorporates configurable channel bandwidths (6 MHz, 8 MHz, 20 MHz), adjustable spectral mask requirements, and geographic location-based regulatory compliance modes that enable a single platform to serve multiple regions and standards while maintaining spectral flexibility.
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AI summary
Multi-channel support within single user, multiple user, multiple access, and/or MIMO wireless communications. A communication device is implemented to encode information bit(s) to encoded bits, which subsequently can undergo processing by an interleaver that is implemented to generate interleaved bits. A constellation mapper is implemented to map the interleaved bits to constellation(s) to generate mapped signals. Two or more inverse discrete fast Fourier transform (IDFT) processors are respectively implemented to process the mapped signals to generate signal streams. For example, a first IDFT processor is implemented to process a first of the mapped signals to generate a first signal stream, and a second IDFT processor is implemented to process a second of the mapped signals to generate a second signal stream. Such a communication device also includes communication interface(s) to transmit the signal streams to at least one additional communication device.