Distributed MU-MIMO Receiver Stomp-and-Restart via RSSI Separation
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Solution Overview
Problem
In CSMA/CA wireless communication systems, co-channel frame collisions often result in both frames being lost due to conventional stomp-and-restart mechanisms assuming collocated receiver paths are equally impacted by shadow fading and path-loss variations, leading to inefficient decoding of stronger frames.
Innovation Solution
A distributed multi-user MIMO system with physically separated radio head devices, each equipped with multiple antennas and a central processor subsystem that groups receivers into disjoint sets based on signal strength and interference ratios, allowing for parallel decoding of frames and adaptive handling of stronger signals during collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional stomp-and-restart mechanisms are used with collocated receiver paths, then decoding simplicity is maintained, but frame decoding success probability decreases during collisions due to identical shadow fading and path-loss impact
Solution Approach 1:
The receiver system is segmented into multiple physically separated receiver paths (distributed receivers) rather than using a single collocated receiver. Each receiver path experiences different shadow fading and path-loss conditions, allowing at least one path to successfully decode frames during collisions even when others fail.
Solution Approach 2:
The system transitions from a single receiver dimension to multiple spatial dimensions by deploying receivers at different physical locations. This spatial separation creates diversity in signal propagation conditions, enabling the system to exploit path-loss variations across different locations to improve decoding success.
2Productivity
If all receiver paths are used for decoding the first frame, then decoding resource utilization is maximized, but ability to switch to stronger second frame during collision is reduced
Solution Approach 1:
The system dynamically assigns receiver paths to different frames based on real-time signal strength measurements. When a second stronger frame is detected during collision, the system adaptively switches specific receiver paths from decoding the first frame to decoding the second frame, optimizing resource utilization while maintaining decoding flexibility.
Solution Approach 2:
Different receiver paths are assigned to decode different frames based on their local signal conditions. Each receiver path independently evaluates signal strength and adapts its decoding target, allowing local optimization of decoding success probability while maintaining overall system productivity.
Data Source
AI summary
A system and method are provided for performing stomp-and-restart techniques in distributed MU-MIMO system. A plurality of radio head devices are provided that are configured to be deployed separated from each other in a coverage region of interest of a wireless network. A central processor subsystem is provided that is in communication with the plurality of radio head devices. The central processor subsystem configured to perform several operations based on downconverted samples received from the plurality of radio head devices.