Multi-Narrowband TVWS Transceiver With Log-Periodic Harmonic Filtering
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Solution Overview
Problem
The television white space (TVWS) spectrum, which includes unused frequencies in the UHF and VHF bands, poses challenges for communication due to its non-continuous nature and sensitivity to interference, limiting its use for devices like IoT devices that require longer range and higher capacity communications.
Innovation Solution
A computerized method using a multi-narrowband transceiver configured with a log periodic filter, which filters out second harmonics, allows for communication within the TVWS spectrum by determining an optimal channel and switching to the corresponding filter element, enabling longer range, higher capacity, and lower power consumption communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If TVWS spectrum is used for communication, then communication coverage and range are improved, but the non-continuous nature of the spectrum limits communication capacity and reliability
Solution Approach 1:
The patent divides the TVWS spectrum into multiple narrowband channels (e.g., 1.25 MHz, 2.5 MHz, or 5 MHz bandwidth channels) instead of using wideband communication. This segmentation allows the system to operate reliably on individual continuous frequency segments while maintaining extended communication range through frequency hopping across multiple segments.
Solution Approach 2:
The patent implements dynamic frequency hopping and channel switching mechanisms that allow the communication system to adaptively select and switch between different TVWS channels based on spectrum availability, interference conditions, and communication requirements. This dynamic approach maintains reliability despite the non-continuous nature of TVWS spectrum.
2Productivity
If single channel capacity is used in TVWS, then device complexity is reduced, but communication capacity is insufficient for satisfactory communication between IoT devices
Solution Approach 1:
The patent segments the available TVWS spectrum into multiple narrowband channels that can be individually accessed. Instead of requiring complex wideband transceivers, the system uses simpler narrowband transceivers that can be frequency-hopped across multiple segmented channels to achieve aggregate communication capacity sufficient for IoT applications.
Solution Approach 2:
The patent designs a universal narrowband transceiver architecture that can operate across multiple TVWS channels and frequency bands. This multi-functional transceiver can adapt to different channel configurations and spectrum conditions, providing versatile communication capability without requiring device-specific complex hardware for each channel.
3Productivity
If TVWS is used for broadband communication, then communication capacity is improved, but sensitivity to interference increases when signal is low
Solution Approach 1:
The patent uses narrowband channel segmentation instead of wideband communication. Each narrowband channel has lower absolute signal power but also lower interference sensitivity due to the reduced bandwidth. The system maintains communication capacity through frequency hopping across multiple narrowband channels rather than relying on high power in a single wideband channel.
Solution Approach 2:
The patent employs frequency hopping and channel switching as intermediary mechanisms that allow the system to avoid interfered channels and transition to cleaner channels. This intermediary approach to channel selection reduces the impact of interference on communication capacity while maintaining overall system productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables IoT devices to operate over tens of miles with large bandwidth, supporting large-scale IoT deployments at long ranges while reducing power consumption and interference, thereby enhancing communication capabilities in remote locations.
Implementation Method 1
the log periodic filter comprises a plurality of filter elements each having a filter frequency increasing periodically in a same frequency increasing factor (K). Each filter of the plurality of filter elements is configured to filter out second harmonics in a defined frequency range.
Implementation Method 2
at least one of transmitting and receiving over the TVWS channel using the filter element
Data Source
AI summary
The disclosure described herein configures a multi-narrowband transceiver for communication within the television white space (TVWS) frequency spectrum using a log periodic filter, wherein the log periodic filter comprises a plurality of filter elements each having a filter frequency increasing periodically in a same frequency increasing factor (K). Each filter of the plurality of filter elements is configured to filter out second harmonics in a defined frequency range. The disclosure determines a TVWS channel for the communication and switches to a filter element of the plurality of filter elements corresponding to the determined TVWS channel. Data is transmitted and/or received over the TVWS channel using the filter element, thereby allowing narrowband communication over the TVWS channel.