Stomp-and-restart interference suppression for wireless frame decoding
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Solution Overview
Problem
In CSMA/CA wireless communication systems, existing stomp-and-restart mechanisms fail to effectively decode stronger frames in collisions due to insufficient signal strength differences between colliding frames, leading to loss of both frames.
Innovation Solution
The enhanced stomp-and-restart technique involves computing channel state information and interference suppression parameters to null out the energy of a weaker first frame, allowing for successful decoding of a stronger second frame by using spatial interference cancellation and automatic gain control to adjust signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a receiver aborts decoding the first frame and re-acquires on the second frame when a stronger frame is received, then the probability of successfully decoding the second frame is improved, but both frames are lost when the signal strength difference is not substantial
Solution Approach 1:
The receiver performs preliminary actions by storing channel state information and computing interference suppression parameters for the first frame before the collision occurs. When a second frame is detected, these pre-computed parameters enable rapid interference suppression and allow the receiver to successfully decode the second frame without losing the first frame's information, thus resolving the contradiction between improving decoding reliability and preventing frame loss
Solution Approach 2:
The receiver converts the harmful interference from the first frame into a beneficial signal by using its channel state information to compute interference suppression parameters. The first frame, which would normally cause collision loss, is transformed into a reference signal that enables the receiver to suppress interference and successfully decode the second frame, thereby converting the harmful collision into a useful interference suppression opportunity
2Reliability
If interference suppression parameters are computed and used to null out the first frame, then successful decoding of the second frame is achieved, but the device complexity increases
Solution Approach 1:
The receiver computes channel state information and interference suppression parameters for the first frame in advance, before the collision occurs. This preliminary computation stores the necessary processing information in memory, so that when a second frame is detected, the receiver can quickly apply the pre-computed parameters without requiring complex real-time calculations, thus reducing the actual processing complexity during the collision event
Solution Approach 2:
The first frame itself provides the information needed for its own suppression. By using the channel state information extracted from the first frame to compute interference suppression parameters, the system makes the interfering signal serve its own suppression, eliminating the need for external reference signals or additional complex processing mechanisms
Data Source
AI summary
Enhanced stomp-and-restart techniques are provided. At a plurality of antennas of a wireless communication device, energy is received in a channel in which one or more frames may be transmitted to the wireless communication device from any one of a plurality of other wireless communication devices. A first frame is acquired from the received energy. Channel state information is computed for the first frame and the channel state information associated with the first frame is stored. Interference suppression parameters are computed for the first frame from the channel state information. It is determined whether a stronger second frame is being received by the wireless communication device. The received energy associated with the first frame is nulled-out using the interference suppression parameters when the stronger second frame is determined to be received so that start-of-packet processing and decoding is performed on the stronger second frame.