Beamforming Coordination for Phase Alignment and Delay Spread Control
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Solution Overview
Problem
Wireless communication networks face issues with phase misalignments and delay spread in beamformed transmissions due to singular value decomposition (SVD), leading to potential packet loss and errors when channel smoothing is applied to channels with large delay profiles.
Innovation Solution
Implement techniques to reduce phase misalignment and delay spread in beamformed messages by ensuring the delay spread of the steered channel is roughly equal to the open-loop channel delay spread, and indicate to the receiving device to apply channel smoothing filtering, using dedicated bits or fields in control signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SVD techniques are used to generate beamformed transmissions, then beamforming performance is improved, but phase misalignments are introduced across tones in the frequency domain
Solution Approach 1:
The patent applies channel smoothing filtering to modify the channel impulse response parameters, reducing the delay spread introduced by SVD beamforming. This filtering operation changes the temporal characteristics of the channel to compensate for phase misalignments across frequency tones, thereby resolving the contradiction between maintaining beamforming performance and achieving phase alignment.
2Measurement precision
If channel smoothing is applied to a channel with a large delay profile, then channel estimation error is reduced, but part of the channel is cut out introducing error or packet loss
Solution Approach 1:
The patent applies channel smoothing filtering to the beamformed transmission channel in advance, before the actual data transmission occurs. This preliminary smoothing operation prepares the channel by reducing delay spread and improving estimation accuracy, while the filtering is designed to preserve the essential channel characteristics needed for reliable packet reception, thus avoiding packet loss.
Data Source
AI summary
This disclosure provides methods, components, devices and systems for coordination for smooth beamforming. Some aspects more specifically relate to techniques to reduce phase misalignment and delay spread to beamformed messages such that a receiving device may apply channel smoothing filtering to the received beamformed message. In some examples, the transmitting device may ensure that the delay spread of the steered channel for a beamformed message is roughly matching the delay spread of an open-loop channel. The transmitting device may signal for the receiving device to perform channel smoothing filtering to a received beamformed message, for example, because the transmitting device applies techniques to reduce the phase misalignment and delay spread to the beamformed message. In some examples, based on the indication, the receiving device may apply channel smoothing filtering to a beamformed transmission received from the transmitting device.