Multi-Sector Antenna Beam Nulling With Predistorted Data Symbols
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Solution Overview
Problem
Existing wireless communication systems employing subband non-overlapping full duplex (SBFD) techniques face significant challenges in managing self-interference and cross-sector interference, which require substantial computing power and memory resources, and legacy receivers struggle to compensate for distortion caused by beam nulling when both types of interference are suppressed.
Innovation Solution
A closed-form beam-nulling algorithm is used to transform a DL beamforming matrix into a transformed matrix that suppresses both self-interference and cross-sector interference, accompanied by pre-distorting data symbols to account for distortion, reducing complexity and enabling receivers to compensate for interference-related distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If iterative beam nulling algorithms are used to suppress self-interference and cross-sector interference, then interference suppression performance is improved, but computing power requirements increase dramatically (requiring multiple teraflops)
Solution Approach 1:
The patent transforms the iterative beam nulling algorithm into a closed-form solution by changing the mathematical approach from iterative optimization to direct computation. This parameter change in the algorithm type reduces computing power requirements from multiple teraflops to a manageable level while maintaining interference suppression performance.
Solution Approach 2:
The patent replaces the complex iterative computational process with a closed-form mathematical expression. This substitution eliminates the need for repeated iterations and dramatically reduces the computing power required to achieve the same interference suppression effect.
2Manufacturing precision
If lookup table (LUT) predistortion techniques are used with beam nulling, then data symbol distortion is compensated, but memory requirements become prohibitively large (requiring hundreds of gigabytes)
Solution Approach 1:
The patent changes the approach from using large lookup tables to store pre-computed distortion values to using a closed-form mathematical expression for distortion compensation. This parameter change in the representation method reduces memory requirements from hundreds of gigabytes to a manageable size while maintaining distortion compensation accuracy.
3Reliability
If beam nulling is applied to suppress both self-interference and cross-sector interference, then overall interference suppression is improved, but distortion of transmitted data symbols increases and becomes dependent on neighboring sectors
Solution Approach 1:
The patent applies preliminary predistortion to the data symbols before beam nulling is applied. This preliminary anti-action counteracts the distortion that will be introduced by the beam nulling operation, ensuring that the overall effect maintains data symbol integrity while achieving comprehensive interference suppression.
Solution Approach 2:
The patent incorporates feedback mechanisms where the beamforming vectors and channel state information from neighboring sectors are taken into account when computing the predistortion. This feedback approach allows the system to compensate for distortion dynamically based on the actual interference environment.
Data Source
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AI summary
An apparatus (300), includes multiple sector antennas, each sector antenna of the sector antennas includes a reception array of antenna array elements (215) and a transmission array of antenna array elements (205), and wherein each sector antenna is configured for transmitting signals to devices (712, 722, 732) within a sector and for receiving signals, using the reception array, from devices within the sector; and processing circuitry configured to transform a downlink beamforming matrix into a transformed downlink beamforming matrix using a closed-form expression, wherein the transformed downlink beamforming matrix is configured to suppress both self-interference and cross-sector interference at individual receiver antenna array elements in a multi-sector antenna arrangement, generate beamformed data symbols based on the transformed downlink beamforming matrix, and deliver the beamformed data symbols associated with the current sector to a downlink transmit antenna included in the multi-sector antenna arrangement.