Coordinated Beamforming Synchronization for Interference Reduction
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Solution Overview
Problem
Wireless networks experience interference due to bursts of energy from beamformed signals when symbol alignments between overlapping networks are not synchronized, leading to issues like packet loss and delays in transmission.
Innovation Solution
A MIMO transceiver with a signal detection circuit and a precoding determination circuit synchronizes symbol alignments between overlapping networks, using a precoding matrix to create a null at overlapping STA locations, thereby reducing interference by aligning symbols and pre-coding signals to avoid energy bursts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If beamformed signals are transmitted in overlapping wireless networks without synchronized symbol alignment, then signal coverage and transmission power are improved, but interference between networks increases causing packet loss and delays
Solution Approach 1:
The system performs preliminary synchronization of symbol alignment between overlapping wireless networks before transmitting beamformed signals. By detecting signals from other networks and determining their symbol alignment, the system proactively adjusts its own symbol timing to match, preventing interference before it occurs. This preliminary action ensures that energy bursts from different networks do not collide, maintaining both high transmission power and low interference.
2Object-affected harmful factors
If symbol alignment is synchronized between overlapping networks, then interference is reduced, but system complexity and detection requirements increase
Solution Approach 1:
The system uses its own transmit chains to detect signals from other wireless networks, effectively making the detection function self-serving. By utilizing existing hardware resources for both transmission and detection, the system avoids adding separate dedicated detection equipment. The signal detection circuit leverages the receive chains that are already part of the MIMO transceiver structure, reducing overall system complexity while achieving the necessary synchronization.
3Object-affected harmful factors
If precoding matrix is used to create nulls at overlapping STA locations, then interference is minimized, but processing complexity and computation requirements increase
Solution Approach 1:
The precoding matrix is designed to create nulls specifically at the locations of wireless stations in overlapping networks, applying interference cancellation only where needed rather than uniformly across all directions. This localized approach focuses computational resources on specific spatial positions where interference would occur, reducing the overall processing complexity compared to omnidirectional interference management while effectively protecting vulnerable STA locations.
Data Source
AI summary
A first transceiver communicates with a first station in a first network according to a first symbol alignment and includes a detection circuit and a precoding determination circuit. The detection circuit detects a signal in a second network from a second transceiver to a second station in the second network via receive chains, coverage areas of the first and second networks overlapping, and determines a second symbol alignment of the signal based on a preamble of the signal in the second network. The precoding determination circuit is coupled to transmit chains, determines a precoding matrix that creates a null in a location of the second station, and determines the first symbol alignment, which is synchronized with the second symbol alignment. The transmit chains pre-code a signal in the first network using the precoding matrix and align symbols of the signal in the first network according to the first symbol alignment.