FDM Beam Switching for DFT-s-OFDM Frequency Preservation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently performing frequency-selective beamforming, particularly in non-terrestrial networks, due to the difficulty in preserving frequency characteristics of DFT-s-OFDM signals in analog beamforming implementations.
Innovation Solution
The use of frequency division multiplexed (FDM) beams generated by respective inverse Fast Fourier Transform (iFFT) components allows for the preservation of frequency characteristics, enabling more efficient and accurate identification of FDM signals based on geographical location, ephemeris information, or beam coverage, facilitating frequency-selective beamforming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If analog beamforming is used for DFT-s-OFDM signals, then beamforming capability is achieved, but frequency characteristics are not preserved
Solution Approach 1:
The patent segments the beamforming process by using multiple iFFT components (first iFFT component and second iFFT component) to generate separate FDM signals for different beams. Each iFFT component processes specific frequency subsets, allowing frequency characteristics to be preserved while achieving beamforming capability through frequency division multiplexing.
2Reliability
If frequency-selective beamforming is implemented in non-terrestrial networks, then network performance is improved, but signal identification becomes difficult
Solution Approach 1:
The patent applies frequency division multiplexing to assign distinct frequency ranges (different 'colors' in the frequency domain) to different beams. The first beam is assigned a first frequency range and the second beam is assigned a second frequency range, making it easier to identify and distinguish between beams while maintaining frequency-selective beamforming capabilities for improved network performance.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a receiving device may receive, from a transmitting device, an aggregated signal including a plurality of frequency division multiplexed (FDM) signals corresponding to a plurality of beams, each of the plurality of FDM signals comprising a waveform associated with a respective inverse fast Fourier transform (iFFT) component of a plurality of iFFT components. The receiving device may decode the plurality of FDM signals based at least in part on at least one of a geographical location, ephemeris information, or beam coverage information. Numerous other aspects are described.