Multi-Antenna Wireless Transmitter with MIMO Beamforming for Spatial Reuse
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Solution Overview
Problem
Existing wireless communication systems face challenges in high-density deployments where multiple access points share the same channel, leading to increased interference, reduced throughput, and inefficient spatial reuse due to conventional power reduction strategies that limit cell coverage and SINR.
Innovation Solution
Implementing a multi-antenna wireless transmitter with MIMO beamforming, utilizing a wireless initiator access point and participator access point to exchange precoder information through null data packets and compressed beamforming frames, enabling adjustable precoding configurations for MU-MIMO communication to enhance spatial reuse and maintain high SINR levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional power reduction strategies are used to reduce interference in high-density deployments, then interference between access points is reduced, but cell coverage and SINR are limited
Solution Approach 1:
The system changes the parameter of transmit power from a reduced state to a higher state by implementing MIMO beamforming, which enables high-power transmission without proportionally increasing interference through spatial focusing of the transmitted signals
Solution Approach 2:
The system applies different transmission characteristics to different spatial directions by using beamforming weights, concentrating transmitted energy toward intended receivers while creating nulls in directions of interfering receivers, thus achieving high power transmission with localized interference management
2Object-affected harmful factors
If conventional power reduction strategies are used to reduce interference in high-density deployments, then interference between access points is reduced, but SINR levels are reduced
Solution Approach 1:
The system changes the transmit power parameter to higher levels while simultaneously applying beamforming processing that maintains high SINR by directing energy spatially, thus breaking the conventional trade-off between power reduction and SINR maintenance
Solution Approach 2:
The beamforming process creates spatially selective transmission quality by focusing energy toward desired receivers and suppressing it toward interfering receivers, enabling high SINR maintenance even with increased transmit power
3Productivity
If MIMO beamforming with adjustable precoding configuration is implemented, then spatial reuse efficiency and SINR are improved, but device complexity increases
Solution Approach 1:
The system performs preliminary action by exchanging precoding matrices and beamforming information between access points before actual data transmission, enabling the complex precoding configurations to be pre-calculated and optimized, thus reducing real-time processing complexity while maintaining high spatial reuse efficiency
Data Source
AI summary
A wireless initiator access point comprising a communication interface with an array of antennas and configured to operate the array of antennas with a precoding configuration for multi-user multiple-input multiple-output (MU-MIMO) communication with a plurality of wireless stations; send a Null Data Packet (NDP) Announcement frame to the wireless stations; trigger a wireless participator access point to send an NDP frame to the wireless stations; receive a plurality of Compressed Beamforming frames from the wireless stations; and forward the Compressed Beamforming frames to the wireless participator access point.