Distributed Resource Unit Pilot Design for PSD Compliance
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in data transmission due to power spectrum density (PSD) limits, restricting transmission range and data rate, especially in wireless local area networks (WLANs) adhering to IEEE 802.11 standards like 802.11be, where PPDU transmission is restricted by PSD limits, leading to suboptimal performance.
Innovation Solution
The solution involves generating a Physical Layer Protocol Data Unit (PPDU) with data and pilot tones distributed across a disjoint set of subcarriers within a larger signal bandwidth using a defined data/pilot tone mapping plan, forming a distributed Resource Unit (dRU), which allows for increased transmission power and extended range while complying with PSD limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PPDU is transmitted in accordance with a power spectrum density (PSD) limit, then transmission complies with regulatory requirements, but transmission range and data rate are restricted
Solution Approach 1:
The patent segments the resource unit (RU) into multiple distributed resource units (dRUs) that are scattered across different subcarrier sets. Each dRU is transmitted independently, allowing the system to distribute transmission power across multiple frequency segments while complying with PSD limits, thereby extending effective transmission range and improving data rate
2Productivity
If multiple-RU support is added to increase data rates, then transmission efficiency improves, but system complexity increases
Solution Approach 1:
The patent creates a universal distributed RU (dRU) structure that can function across multiple resource units and frequency bands. The dRU design allows a single transmission framework to handle multiple RUs simultaneously, providing multi-functionality that increases data rate while avoiding the need for separate processing systems for each RU
3Measurement precision
If pilot tones are distributed across disjoint subcarriers in distributed RUs, then channel estimation accuracy improves, but pilot tone placement complexity increases
Solution Approach 1:
The patent applies local quality by placing pilot tones at specific optimal positions within each distributed RU's subcarrier set. Each dRU receives tailored pilot tone placement according to its local frequency characteristics and channel conditions, improving channel estimation accuracy while maintaining manageable complexity through localized rather than global optimization
Data Source
AI summary
A wireless communication system, apparatus, and methodology are described for enabling wireless communication station (STA) devices to generate a Physical Layer Protocol Data Unit (PPDU) that includes a resource unit (RU) having a size that is less than a spreading frequency block by using one or more predetermined pilot and/or data tone mapping plans to control how each pilot/data tone from the RU is distributed onto a disjoint set of pilot/data subcarriers forming a distributed RU included in the spreading frequency block, thereby accommodating transmission of wider bandwidth and multiple resource unit assignments in accordance with power spectrum density (PSD) limits provided for orthogonal frequency-division multiplexing (OFDM) modulated symbols supported by emerging 802.11 standards.