Spatio-Temporal Filtering for Wireless Interference Rejection
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Solution Overview
Problem
In wireless communication systems, increasing interference from multiple client devices leads to data packet collisions, causing losses in data transmission as access points struggle to decode packets properly due to simultaneous receptions from multiple clients.
Innovation Solution
A method and system utilizing a radio head with multiple antennas, where a filter is determined and applied to mitigate interference by isolating and removing interfering signals, allowing for the recovery of data packets from client devices by using spatial filtering techniques, such as single or multiple sub-band filters, to decode packets accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple client devices transmit data packets simultaneously to increase network utilization, then network productivity improves, but interference increases causing packet collision and loss
Solution Approach 1:
The patent extracts and removes the interfering signal from the received composite signal. By identifying the interfering packet through correlation with a database of known interfering packets, the system isolates and eliminates the interference component, allowing the desired packet to be recovered without retransmission.
Solution Approach 2:
The patent introduces an intermediary database of known interfering packets that mediates between the received signal and the decoding process. This database serves as a reference to identify and characterize interfering signals, enabling the system to distinguish between desired and interfering packets and apply appropriate filtering.
2Reliability
If traditional interference mitigation techniques are used to reduce packet loss, then reliability improves, but significant delay is introduced reducing network efficiency
Solution Approach 1:
The patent performs preliminary action by pre-populating a database with known interfering packets before the actual data transmission occurs. This advance preparation enables rapid identification and filtering of interfering signals during reception, avoiding the need for complex real-time analysis and reducing processing delay.
Solution Approach 2:
The patent skips the traditional multi-step interference mitigation process by directly correlating received signals with known interfering packets in the database. This direct matching approach rushes through the interference identification and filtering process in a single operation, minimizing delay while maintaining reliability.
3Productivity
If multiple antennas receive signals in parallel to increase data throughput, then productivity improves, but signal collision and interference increase
Solution Approach 1:
The patent converts the harmful effect of signal interference into a benefit by using the known structure of interfering packets (stored in the database) to identify and filter them. The interference, rather than being merely eliminated, is utilized as a recognizable pattern that enables selective removal while preserving the desired signal.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively recovers data packets by filtering out interfering signals, improving wireless network communication efficiency and reducing packet loss due to collisions, even in scenarios where multiple client devices transmit simultaneously.
Implementation Method 1
filtering the received first and second signals using the filter to mitigate interference caused by the first signal being received in parallel with the second signal
Data Source
AI summary
Embodiments herein describe recovering data packets received by a plurality of wireless antennas of a radio head. In one embodiment, the signals received by the radio head are filtered using a single filter to recover at least one data packet. In another embodiment, the signals received by the radio head are filtered using a plurality of filters to recover at least one data packet. In one embodiment, a controller coupled with the radio head filters the received signals and recovers the at least one data packet.