Distributed RU Pilot Layout for Reliable Wireless Data Transmission
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Solution Overview
Problem
The issue of narrowband interference and frequency selective fading in pilot signal transmission due to sparse distribution of pilot subcarriers in wireless networks, which affects transmission reliability.
Innovation Solution
Distributing pilot signals evenly across a determined frequency band by allocating discrete resource units (RUs) to devices, ensuring pilot subcarriers are fixed and non-overlapping, and using orthogonal matrices to separate pilot signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If pilot subcarriers are sparsely distributed on a frequency band to reduce subcarriers per MHz, then transmit power can be increased, but narrowband interference and frequency selective fading occur affecting transmission reliability
Solution Approach 1:
The frequency band is divided into multiple discrete RU groups, with pilot subcarriers segmented and distributed across these groups. This segmentation allows pilot subcarriers to cover the entire frequency band more uniformly while maintaining the expanded transmit bandwidth, thereby resolving the contradiction between increased transmit power and pilot signal transmission reliability.
2Area of stationary object
If pilot subcarriers are sparsely distributed on a frequency band, then bandwidth can be expanded, but pilot signal transmission is greatly affected by interference and fading
Solution Approach 1:
The frequency band is divided into multiple discrete RU groups, with pilot subcarriers segmented and distributed across these groups. This segmentation allows pilot subcarriers to cover the entire frequency band more uniformly while maintaining the expanded transmit bandwidth, thereby resolving the contradiction between increased transmit power and pilot signal transmission reliability.
3Productivity
If discrete RUs are allocated to devices, then subcarriers can be distributed more discretely in frequency domain, but pilot subcarriers cannot evenly cover the entire frequency band
Solution Approach 1:
The frequency band is divided into multiple discrete RU groups, with pilot subcarriers segmented and distributed across these groups. This segmentation allows pilot subcarriers to cover the entire frequency band more uniformly while maintaining the expanded transmit bandwidth, thereby resolving the contradiction between increased transmit power and pilot signal transmission reliability.
Solution Approach 2:
Pilot subcarriers from multiple discrete RU groups are merged and distributed across the entire frequency band. This merging ensures uniform coverage of the frequency band by pilot subcarriers while maintaining the spectral efficiency benefits of discrete RU allocation.
Data Source
AI summary
This application provides example methods for sending data in a wireless network, and example related apparatuses. One example method includes determining, by a first device, a distributed resource unit (RU) allocated to the first device, where the distributed RU includes data subcarriers and pilot subcarriers, all subcarriers of one distributed RU are distributed on a first frequency band, a size of the first frequency band is 20 MHz, the first frequency band includes a maximum of 18 pilot subcarriers that are disposed at an interval, a quantity of pilot subcarriers included in one distributed RU is greater than or equal to 2, and at least two pilot subcarriers included in one distributed RU are spaced by at least M pilot subcarriers. The first device sends a physical layer protocol data unit (PPDU) on the distributed RU.