Implicit Beamforming via Reverse Channel Estimation
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Solution Overview
Problem
In wireless communication systems, devices that do not support explicit beamforming protocols cannot participate in beamforming training, limiting transmission reliability between communication devices with multiple antennas.
Innovation Solution
A method for implicit transmit beamforming, where a communication device determines that a non-sounding data unit from a device without explicit support is used to estimate the reverse channel, and subsequently the forward channel, to develop a transmit beamforming matrix for communication via a forward channel, without requiring explicit beamforming support from the receiving device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If explicit beamforming training protocols are used, then transmission reliability is improved for devices that support them, but devices without explicit support cannot participate in beamforming training
Solution Approach 1:
Instead of having the transmitter initiate beamforming training (explicit method), the invention inverts the approach by having the receiver transmit a data unit that the transmitter can use to estimate the reverse channel, which is then used to derive the forward channel for beamforming matrix calculation. This allows devices without explicit beamforming support to participate in the process.
Solution Approach 2:
The invention uses a non-sounding data unit as an intermediary carrier to convey channel information. Rather than requiring dedicated beamforming training packets, the system embeds channel estimation capabilities within regular data units that all devices can transmit and receive, serving as a mediator between devices with and without explicit beamforming support.
2Reliability
If beamforming training protocols are implemented, then spatial gain patterns are improved, but the complexity of the communication protocol increases
Solution Approach 1:
The invention makes regular non-sounding data units serve multiple functions: they carry both data communication and channel estimation information. This eliminates the need for separate dedicated training protocols, reducing overall protocol complexity while maintaining beamforming capabilities.
Solution Approach 2:
The system uses the receiver's own transmitted data units to provide the transmitter with channel information. The receiver essentially serves itself by transmitting data units that simultaneously fulfill communication and channel sounding purposes, eliminating the need for separate training phases and reducing protocol overhead.
3Adaptability or versatility
If non-sounding data units are used for channel estimation, then explicit beamforming support is not required at the receiver, but the receiver must still transmit data units that can be used for estimation
Solution Approach 1:
The receiver performs channel estimation using its own transmitted data units. By sending regular data units, the receiver automatically provides the transmitter with the information needed for beamforming, without requiring the receiver to understand or participate in complex beamforming training protocols.
Data Source
AI summary
A first communication device receives a non-sounding data unit from a second communication device that does not support beamforming training procedures. The first communication device develops an estimate of a reverse channel via which the non-sounding data unit traveled based on the non-sounding data unit. The first communication device develops a transmit beamforming matrix based on the estimate of the reverse channel, the transmit beamforming matrix for the first communication device to utilize when transmitting via a forward channel.