Massive MIMO Receive Beamforming Weight Matrix Determination
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Solution Overview
Problem
In massive-MIMO transmission schemes, determining suitable beamforming weights is computationally intensive due to the large number of antenna elements, leading to excessive processing load.
Innovation Solution
A method that generates and selects receive beamforming output components in decreasing order of reception power to determine a suitable receive beamforming weight matrix, reducing the number of combinations to be calculated and thus the computational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large number of antenna elements are used in massive-MIMO transmission schemes, then signal transmission speed is increased and interference is reduced, but processing load becomes excessive
Solution Approach 1:
The patent segments the beamforming weight determination process into two distinct stages: first determining transmit beamforming weights independently, then determining receive beamforming weights based on the transmit weights. This segmentation breaks down the computationally intensive problem of determining all possible weight combinations into manageable sequential steps, reducing the overall processing load while maintaining transmission performance
Solution Approach 2:
The patent applies preliminary action by determining the transmit beamforming weights before determining the receive beamforming weights. This preliminary determination of transmit weights provides a foundation for the subsequent receive weight determination, eliminating the need to evaluate all possible weight combinations simultaneously and thereby reducing computational complexity
2Measurement precision
If calculation is carried out on all combination patterns of beamforming weights, then suitable beamforming weights are determined, but computational complexity becomes excessive
Solution Approach 1:
The patent segments the beamforming weight determination into independent transmit and receive components, evaluating weights separately rather than as complete combinations. This segmentation maintains the accuracy of weight determination by evaluating each component thoroughly while avoiding the combinatorial explosion of evaluating all possible combinations
Solution Approach 2:
The patent applies partial action by determining transmit beamforming weights first, and then using only those specific transmit weights as the basis for determining receive beamforming weights, rather than evaluating all possible receive weights against all possible transmit weights. This partial evaluation approach maintains sufficient accuracy for practical beamforming while dramatically reducing computational requirements
Data Source
AI summary
A number LR of receive beamforming circuits provided in a receive beamformer execute receive beamforming (NR/LR) times with respect to a received signal vector received by NR reception antennas AR, thereby generating a receive beamforming (BF) output vector having NR receive BF output components. A calculation processor calculates a reception power for each of the NR receive BF output components, selects LR receive BF output components in decreasing order of reception power, and determines a suitable receive BF weight matrix including LR reception orthogonal BF weight vectors corresponding to the selected receive BF output components.