Beam Gain Adjustment via Null Widening in Wireless Networks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication networks face challenges in adjusting beam gain effectively, particularly in systems with large antenna arrays, as existing methods are inadequate for reducing beam gain beyond power limitations and are computationally expensive, especially when using Reciprocity Assisted Transmission (RAT) and Multiple-Input Multiple-Output (MIMO) transmissions.
Innovation Solution
A mechanism is introduced for adjusting beam gain using a single beam widening parameter and an iterative procedure, involving a null widening parameter to modify the channel matrix, which allows for non-linear reduction of beam gain to meet pre-determined limits, utilizing a tabulated approach for initialization and iterative root finding methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamforming gain is increased to improve capacity and coverage, then network performance is improved, but interference to other systems increases and operator requirements are violated
Solution Approach 1:
The patent applies parameter changes by modifying the channel matrix through a null widening parameter (rho) that transforms the beamforming weights. This mathematical transformation adjusts the beam pattern parameters to reduce peak gain while maintaining coverage, thereby reducing interference to other systems while preserving network performance
2Productivity
If Reciprocity Assisted Transmission (RAT) and MIMO techniques are used to enhance transmission efficiency, then data rate is improved, but computational complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-computing the null widening parameter and its effect on beam gain reduction. By determining the appropriate parameter transformation in advance based on the channel matrix, the system avoids complex real-time calculations during transmission, thereby reducing computational complexity while maintaining high data rates through RAT and MIMO
3Object-affected harmful factors
If beam gain is reduced to meet operator requirements, then interference is minimized, but communication quality may deteriorate
Solution Approach 1:
The patent applies local quality by using the null widening parameter to selectively reduce beam gain only in specific directions where interference occurs, while maintaining adequate gain in other directions for communication quality. This localized adjustment through mathematical transformation of the channel matrix ensures interference reduction without compromising overall communication reliability
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Embodiments of the disclosure provide a method for adjusting beam gain in a radio network node. The method comprises: obtaining a channel estimate based on a reference signal transmitted by a target wireless device; applying a set of weights to the channel estimate to obtain a weighted channel estimate; and outputting the weighted channel estimate for use in determining beamforming weights to be applied to signals output to a plurality of antenna elements for transmission to the target wireless device, wherein the beamforming weights are determined as a function of the weighted channel estimate.