Distributed Resource Unit Tone Layout for Frequency Diversity and Power
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems inefficiently utilize available transmit power due to suboptimal allocation of data and pilot tones within resource units (RUs), leading to reduced power spectral density and frequency range utilization.
Innovation Solution
Distribute resource units across a channel bandwidth by allocating data tones in contiguous groups and pilot tones at edges or center, ensuring defined spacing to enhance frequency diversity and power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resource units are allocated with conventional tone placement, then device complexity is reduced, but frequency diversity and power spectral density utilization are worsened
Solution Approach 1:
The patent segments the resource unit into multiple distributed tone groups spread across the channel bandwidth, with each group containing data tones and pilot tones separated by at least one empty tone. This segmentation increases frequency diversity by distributing tones across multiple frequency locations rather than concentrating them in a single contiguous block.
Solution Approach 2:
The patent applies different allocation strategies to different parts of the channel bandwidth. Pilot tones are positioned at specific locations (edges or center) of the bandwidth, while data tones are distributed in groups at other locations. This local differentiation optimizes both frequency diversity and power spectral density utilization without requiring complete redesign of the entire tone allocation system.
2Power
If tones are concentrated in a narrow bandwidth, then device complexity is reduced, but power spectral density and available transmit power are worsened
Solution Approach 1:
The patent transitions from a one-dimensional contiguous tone allocation to a two-dimensional distributed allocation pattern. Tones are arranged in multiple groups across different frequency locations, effectively utilizing the frequency dimension to spread power spectral density over a wider bandwidth, thereby increasing available transmit power without exceeding regulatory limits.
Solution Approach 2:
The patent changes the spatial distribution parameter of tones within the frequency domain. By introducing separation of at least one empty tone between pilot tones and data tones, and by distributing multiple tone groups across the channel bandwidth, the system achieves better power spectral density utilization and increased available transmit power.
3Reliability
If pilot tones are placed close to data tones, then device complexity is reduced, but frequency diversity and channel estimation accuracy are worsened
Solution Approach 1:
The patent extracts pilot tones from the immediate vicinity of data tones and positions them at distinct locations within the channel bandwidth (such as edges or center). This separation allows pilot tones to serve multiple data tone groups effectively, improving channel estimation accuracy while maintaining manageable device complexity through standardized placement patterns.
Data Source
AI summary
This disclosure provides methods, devices and systems for configuring tones for a distributed resource unit (RU) across a channel bandwidth to improve frequency diversity and available transmit power. A distributed RU may include a set of tones that may be allocated across a bandwidth that is greater than a bandwidth of the aggregate quantity of tones. The set of tones may include a set of data tones grouped into contiguous groups of one or more data tones and a set of non-contiguous pilot tones. The data tones may be mapped to useful tones over a center portion of a half-bandwidth of the channel. The pilot tones may be mapped near edge tones at edges of the channel bandwidth or near direct current tones at a center of the channel bandwidth. A system bandwidth may include one or more channel bandwidths associated with distributed RUs.