Resource Offset Mapping to Contain LO Leakage Distortion
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Solution Overview
Problem
Existing wireless communication systems face challenges in minimizing the impact of local oscillator (LO) leakage at sub-THz frequencies, which can cause distortion and reduce throughput and reliability.
Innovation Solution
Implement resource offset mapping by separating frequency-domain symbols into different subsets of subcarriers with gaps to avoid spreading distortion from one subset to another, using techniques like DFT-s-OFDM to minimize LO leakage impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency-domain symbols are mapped to contiguous subcarriers, then resource utilization is maximized, but distortion from LO leakage spreads across all subcarriers reducing reliability
Solution Approach 1:
The patent divides the frequency-domain symbols into multiple subsets and maps them to separate subsets of subcarriers with gaps between them. This segmentation prevents distortion from LO leakage in one subset from spreading to other subsets, thereby improving communication reliability while maintaining efficient resource utilization through structured frequency allocation.
2Reliability
If resource offset mapping with gaps is implemented, then distortion containment is improved, but frequency-domain resource allocation becomes more complex
Solution Approach 1:
The patent employs dynamic resource allocation where the network entity can flexibly assign different subsets of subcarriers to different wireless devices based on channel conditions and interference levels. This dynamic approach allows the system to adapt to varying operational requirements while maintaining the gap-based structure that contains distortion, balancing reliability improvement with manageable system complexity.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. For instance, the described techniques support resource offset mapping for multiplexing. Resource offset mapping may refer to the mapping of frequency-domain symbols to different subsets of resources that are offset from each other or separated by gaps. For instance, a first wireless device may map a first set of frequency-domain symbols to a first subset of subcarriers and a second set of frequency-domain symbols to a second subset of subcarriers. A lowest subcarrier of the second subset of subcarriers may be separated by an offset or a gap from a highest subcarrier of the first subset of subcarriers. As a result, at least some distortion experienced on subcarriers in the gap may not spread to other subcarriers, and the reliability and throughput of communications between the first wireless device and a second wireless device may improve.