Binning-Based Transmit Beamforming for Wireless Systems
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Solution Overview
Problem
In wireless communication systems like Bluetooth, the master device faces challenges in obtaining a current beamforming vector due to its transmit-receive order, leading to outdated beamforming weights when the channel coherence time exceeds the return time to the same hopping channel, resulting in performance degradation.
Innovation Solution
The technology exploits time and frequency correlation by grouping nearby channels into bins, using the most recent beamforming vector estimate within each bin to infer weights for the current channel, with implementations including global binning, local binning, and adaptive binning to optimize bin-width for changing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the master device uses the most recent beamforming vector estimate from the previous receive time slot, then the beamforming weights are available for transmission, but the beamforming weights become outdated when the channel coherence time exceeds the return time to the same hopping channel
Solution Approach 1:
The master device performs beamforming vector estimation in advance during the receive time slot before the next transmission. By preparing the beamforming weights beforehand using the received packet with known preamble, the system ensures that current beamforming weights are available when needed, reducing the time delay and preventing outdated weights from being used.
Solution Approach 2:
The system utilizes feedback from the slave device's received signal quality measurements to update the beamforming vector. The slave device measures the received signal strength indicator (RSSI) and provides feedback that helps the master device refine its beamforming weight estimates, ensuring continued accuracy even as channel conditions change.
2Ease of operation
If the master device transmits first and then receives, then the standardized transmit-receive order is maintained, but the most recent beamforming vector is not available at the master device during a Tx beamforming in a transmit time slot
Solution Approach 1:
The master device performs beamforming vector estimation in advance during the receive time slot before the next transmission. By preparing the beamforming weights beforehand using the received packet with known preamble, the system ensures that current beamforming weights are available when needed, reducing the time delay and preventing outdated weights from being used.
Solution Approach 2:
The system dynamically adapts the beamforming vector based on the timing of the last receive operation. The master device updates its beamforming weights whenever a receive operation occurs, allowing the system to maintain accuracy while following the standardized transmit-receive order. This dynamic updating ensures that the most recent beamforming information is always available.
Data Source
AI summary
A binning-based transmit beamforming for wireless communication systems includes determining a time correlation and a frequency correlation of a beamforming vector estimated from a previous transmission on a current hopping channel and one or more neighboring channels using one or more binning architectures that exploit channel correlation in both frequency and time dimensions. These binning architectures include global binning, local binning, and adaptive version of global and local binning. The subject system determines one or more beamforming weights for the current hoping channel according to the binning architecture, and provides, for transmission, a signal using transmit beamforming based on the one or more beamforming weights.