Multi-Sub-Band DFT-S-OFDM for Frequency-Selective Channels
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Solution Overview
Problem
Wireless communications systems experience equalization loss and inter-symbol interference due to frequency selective channels when using DFT-S-OFDM signals, particularly when signal bandwidth exceeds channel bandwidth.
Innovation Solution
Divide DFT-S-OFDM signals into multiple sub-band transmissions across different frequency bands to reduce equalization loss and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single wideband DFT-S-OFDM transmission is used, then the communication bandwidth is充分利用, but equalization loss and inter-symbol interference increase due to frequency selective channels
Solution Approach 1:
The patent divides a wideband DFT-S-OFDM transmission into multiple sub-band transmissions. Each sub-band is transmitted separately over frequency-selective channels, avoiding the equalization loss and inter-symbol interference that occur when a single wideband signal spans beyond channel bandwidth. The receiver combines the sub-band transmissions to reconstruct the original wideband signal, thus maintaining both bandwidth utilization and signal quality.
2Quantity of substance
If DFT-S-OFDM signal bandwidth exceeds channel bandwidth, then more frequency resources are utilized, but frequency selective fading and equalization loss occur
Solution Approach 1:
The patent segments the DFT-S-OFDM signal into multiple sub-band transmissions, each confined within the channel bandwidth. This segmentation ensures that each sub-band experiences minimal frequency selective fading while collectively utilizing the full available frequency resources. The sub-bands are transmitted separately and combined at the receiver to achieve both wideband resource utilization and resistance to frequency selective fading.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A network entity transmits capability information that indicates a capability of the network entity to participate in wideband communication through use of multiple single carrier waveforms, where each of multiple single carrier waveforms are associated with a corresponding sub-band of multiple sub-bands within the wideband communication. The network entity receives an indication that configures the network entity for participation in the wideband communication via the multiple single carrier waveforms and the plurality of sub-bands. The network entity receives scheduling information that schedules the wideband communication via the plurality of single carrier waveforms and the plurality of sub-bands. The network entity participates in the wideband communication via the multiple single carrier waveforms and the plurality of sub-bands.