Adaptive Spectral Content Variation for Wireless Interference Reduction
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Solution Overview
Problem
Wireless communications systems face limitations in bandwidth, leading to challenges in transmitting voice, data, and multimedia content effectively, and existing methods are vulnerable to interception and interference due to cyclostationary signatures.
Innovation Solution
The implementation of a wireless communications system that generates and transmits baseband waveforms with varied spectral content, using non-contiguous frequency intervals devoid of frequency content to reduce interference, and employs Gaussian-distributed orthonormal waveforms to eliminate cyclostationary signatures, enhancing privacy and resistance to jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If available bandwidth is increased to transmit more voice/data/multimedia content, then transmission capacity is improved, but interference from other communications increases
Solution Approach 1:
The frequency spectrum is divided into multiple non-contiguous frequency intervals (first frequency interval, second frequency interval, third frequency interval) rather than using a single continuous bandwidth. This segmentation allows the system to transmit information across distributed frequency bands while leaving gaps (third frequency interval) to reduce interference with other communications.
Solution Approach 2:
Different frequency intervals are used with different spectral content characteristics. The baseband waveform is designed to have substantial spectral content in the first and second frequency intervals while being substantially devoid of spectral content in the third frequency interval, creating local quality variations that reduce interference in specific frequency regions.
2Device complexity
If conventional waveforms are used for transmission, then system complexity is reduced, but vulnerability to interception and detection increases
Solution Approach 1:
The patent changes the spectral content parameters of the transmitted waveform by using non-contiguous frequency intervals and controlling the spectral distribution within those intervals. This parameter change eliminates cyclostationary signatures that make conventional waveforms detectable, thereby improving privacy and security without requiring fundamentally different transmission mechanisms.
Data Source
AI summary
A spectral content of a baseband waveform is varied and a measure of the baseband waveform whose spectral content has been varied is used by a transmitter in order to convey information. According to embodiments of inventive concepts, a set of frequencies that is used to provide spectral content to the baseband waveform is varied. In some embodiments, the spectral content comprises non-contiguous first and second frequency intervals wherein a third frequency interval that is between the first and second frequency intervals remains substantially devoid of providing spectral content in order to reduce or avoid interference. In other embodiments, the spectral content that is varied comprises a bandwidth that is varied. The inventive concepts are relevant to 4G LTE carrier aggregation systems/methods and/or other aspects of 4G LTE. Various transmitter/receiver embodiments are disclosed including direct synthesis transmitter/receiver embodiments.