MIMO Beamforming Vector Allocation for Multi-User Gain
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Solution Overview
Problem
In multi-user MIMO communication systems, unselected beamforming vectors are often wasted, reducing the multi-user gain and efficiency, as they are not utilized for data transmission, leading to interference and decreased data transmission rates.
Innovation Solution
A MIMO communication apparatus and method that determines selected beamforming vectors for selected users and allocates non-selected beamforming vectors to non-selected users based on channel quality information to maximize SINR and data transmission rates, using a Per-User Unitary Rate Control scheme and performance information generation to select additional beamforming vectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If beamforming is performed for only particular users using selected beamforming vectors, then interference between multiple users is reduced, but unselected beamforming vectors are wasted and multi-user gain is reduced
Solution Approach 1:
The patent recovers and reuses unselected beamforming vectors by allocating them to non-selected users. Instead of discarding these vectors after selecting only certain users for beamforming, the system reallocates the previously unselected vectors to remaining users, thereby reducing waste and improving overall system productivity while maintaining interference reduction benefits
Solution Approach 2:
The patent makes beamforming vectors universal by enabling them to serve multiple purposes and multiple users. Selected beamforming vectors serve selected users, while unselected beamforming vectors are subsequently allocated to non-selected users, allowing the same set of vectors to provide multi-user gain across different user groups rather than being limited to a single function
2Device complexity
If only selected beamforming vectors are used for beamforming, then system complexity is reduced, but efficiency is decreased due to wasted unselected beamforming vectors
Solution Approach 1:
The patent introduces dynamic allocation of beamforming vectors based on user selection status. The system adaptively assigns selected beamforming vectors to selected users and unselected beamforming vectors to non-selected users, creating a flexible two-stage allocation process that improves system efficiency without significantly increasing processing complexity
3Productivity
If multi-user MIMO technology is used to transmit data to multiple users via multiple antennas, then multi-user gain and multiple antenna gain are obtained, but interference occurs between multiple users which reduces data transmission rate
Solution Approach 1:
The patent segments users into two distinct groups: selected users who receive beamforming service first, and non-selected users who receive service from unselected beamforming vectors. This segmentation allows the system to manage interference by treating different user groups differently, allocating resources in a structured manner that reduces inter-user interference while maintaining multi-user gain
Data Source
AI summary
A multiple-input multiple-output (MIMO) communication method and apparatus are provided. A MIMO communication apparatus includes a selected beamforming vector determining unit to determine a selected beamforming vector corresponding to a selected user, a performance information generating unit to generate performance information corresponding to where a non-selected beamforming vector is allocated to a non-selected user, and an additional beamforming vector selecting unit to select an additional beamforming vector corresponding to the non-selected user based on the performance information.