Distributed Resource Unit Uplink Using CSD to Prevent Beamforming
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in preventing unintentional beamforming when multiple stations transmit data, leading to interference and reduced efficiency.
Innovation Solution
Implementing phase shift diversity (CSD) with different CSD values for odd and even subcarriers to separate uplink bandwidth and prevent unintentional beamforming among stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple stations transmit data simultaneously using the same bandwidth, then communication throughput is improved, but unintentional beamforming interference increases
Solution Approach 1:
The patent segments the uplink bandwidth into multiple portions (odd and even subcarriers) and assigns different CSD values to each portion. This segmentation prevents unintentional beamforming by ensuring that stations transmit on different subcarrier sets with different phase shifts, thereby maintaining high throughput while eliminating interference.
Solution Approach 2:
The patent applies different CSD (cyclic shift diversity) values to different subcarrier portions (odd vs even) locally within the bandwidth. This local differentiation ensures that each station's transmission has unique phase characteristics on specific subcarriers, preventing beamforming interference while allowing simultaneous transmissions.
2Device complexity
If CSD values are reused across stations, then device complexity is reduced, but beamforming prevention effectiveness decreases
Solution Approach 1:
The patent changes the CSD value parameter based on the subcarrier portion being used. Specifically, stations use different CSD values for odd and even subcarriers, which maintains beamforming prevention effectiveness while keeping the configuration systematic and manageable through defined patterns rather than random complex assignments.
Data Source
AI summary
A station may receive a trigger frame from an access point. The station may divide an uplink bandwidth into multiple portions (e.g., odd and even subcarriers) based on the trigger frame. The same cyclic shift diversity value may be used for: a first spatial stream with a first portion of subcarriers, and a second spatial stream using a second portion of the subcarriers, which may reduce unintentional beamforming.