Non-Sinusoidal Waveform Multicarrier Communication for IoT
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Solution Overview
Problem
Current radio communication technologies, particularly OFDM, face challenges in reducing hardware resources and power consumption while maintaining high data rates and reliability, especially in applications like IoT where resources are limited.
Innovation Solution
The use of non-sinusoidal waveforms, such as square waves, for multicarrier communication, where fundamental frequencies are assigned to carriers to ensure disjoint harmonic components, reducing inter-channel interference (ICI) and allowing for reduced hardware requirements and power consumption, while maintaining compatibility with OFDM systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional OFDM with sinusoidal carriers is used, then high data rates and reliability are achieved, but hardware resources and power consumption increase
Solution Approach 1:
The patent changes the waveform parameter from sinusoidal to non-sinusoidal (square wave), which fundamentally alters the carrier generation requirements. Square waves can be generated using simple switching elements rather than complex sinusoidal oscillators, directly reducing power consumption while maintaining the multicarrier modulation capability needed for high data rates
Solution Approach 2:
The patent replaces expensive, complex sinusoidal oscillator hardware with cheaper, simpler switching elements that generate square waves. This substitution reduces hardware complexity and power consumption while achieving comparable communication performance through the harmonic components of the square wave carriers
2Productivity
If conventional OFDM with sinusoidal carriers is used, then high data rates and reliability are achieved, but hardware complexity increases
Solution Approach 1:
The patent changes the waveform parameter from sinusoidal to non-sinusoidal (square wave), which fundamentally alters the carrier generation requirements. Square waves can be generated using simple switching elements rather than complex sinusoidal oscillators, directly reducing power consumption while maintaining the multicarrier modulation capability needed for high data rates
Solution Approach 2:
The patent replaces expensive, complex sinusoidal oscillator hardware with cheaper, simpler switching elements that generate square waves. This substitution reduces hardware complexity and power consumption while achieving comparable communication performance through the harmonic components of the square wave carriers
3Device complexity
If non-sinusoidal waveforms are used for multicarrier communication, then hardware requirements and power consumption are reduced, but inter-channel interference may increase
Solution Approach 1:
The patent segments the frequency spectrum by carefully assigning fundamental frequencies to different carriers such that their harmonic components occupy disjoint frequency sets. This segmentation prevents overlap and interference between carriers, solving the ICI problem while maintaining the simplicity of non-sinusoidal waveform generation
Solution Approach 2:
The patent applies local quality by ensuring that each carrier's harmonic components are confined to specific, non-overlapping frequency regions. This localized frequency allocation allows non-sinusoidal waveforms to be used without causing inter-channel interference, as each carrier's spectral energy is contained within its designated frequency band
Data Source
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AI summary
A technique for transmitting data on carriers each using a non-sinusoidal waveform is described. As to a method aspect of the technique, a fundamental frequency (118) is assigned to each of the carriers using the non-sinusoidal waveform. Baseband frequencies corresponding to a set of harmonic components of the non-sinusoidal waveform at each of the assigned fundamental frequencies (118) are disjoint. An energy of each of the harmonic components in the set is greater than a predefined threshold value. Modulation symbols (116) representative of the data are transmitted on at least one or all of the carriers.