MU-MIMO Weight Design for Receiver Capability Pairing
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Solution Overview
Problem
In multi-user multiple-input multiple-output (MU-MIMO) wireless communication systems, existing weight design solutions treat all user equipment equally, leading to degraded signal quality for user equipment with weaker receiver capabilities and underutilized interference suppression capabilities of those with stronger receiver capabilities.
Innovation Solution
A method where the base station determines user equipment pairing and weight design based on receiver capabilities, using unidirectional zero forcing to ensure channel quality for weak-receiver-capability users and maintain channel quality for strong-receiver-capability users by leveraging their superior interference suppression abilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If all user equipments are treated equally in MU weight design process, then device complexity is reduced and ease of operation is improved, but signal quality of weak-receiver-capability user equipment degrades and interference suppression capability of strong-receiver-capability user equipment is wasted
Solution Approach 1:
The patent applies local quality by differentiating the weight design process based on receiver capability levels. Strong-receiver-capability user equipment undergoes interference cancellation processing while weak-receiver-capability user equipment does not, creating localized quality adjustments tailored to each device's capabilities rather than applying a uniform approach to all equipment.
2Reliability
If receiver capability-based pairing is implemented, then signal quality of weak-receiver-capability user equipment is ensured and interference suppression capability of strong-receiver-capability user equipment is utilized, but device complexity increases
Solution Approach 1:
The patent segments user equipment into two distinct groups based on receiver capability: strong-receiver-capability user equipment that performs interference cancellation, and weak-receiver-capability user equipment that does not. This segmentation simplifies the overall system design by creating clear boundaries and distinct processing paths for different device types, making the complexity manageable through structured division.
Solution Approach 2:
Strong-receiver-capability user equipment serves itself by performing interference cancellation processing autonomously to eliminate interference from other paired user equipment. This self-service capability allows these devices to improve their own signal quality without requiring additional network intervention, thereby managing complexity at the device level rather than the network level.
3Object-affected harmful factors
If downlink weight adjustment is performed after MU pairing, then interference between paired user equipments is avoided, but productivity decreases due to additional processing steps
Solution Approach 1:
The patent performs preliminary actions by pre-calculating and notifying downlink weights and modulation and coding scheme (MCS) information to user equipment before actual data transmission begins. This preliminary provision of weighting information allows user equipment to prepare their reception processing in advance, eliminating the need for iterative weight adjustments during transmission and thereby improving processing efficiency while still preventing interference.
Data Source
AI summary
Embodiments of the present invention relate to a signal sending method, a signal receiving method, a base station, and user equipment. The method includes: determining, by a base station based on receiver capabilities of user equipments, that first user equipment is to be paired with N second user equipments on a first resource block, where N is a positive integer; and multiplexing, by the base station, a signal of the first user equipment and signals of the N second user equipments onto the first resource block, and sending the signals. It can be learned from the foregoing that according to the embodiments of the present invention, not only channel quality of weak-receiver-capability user equipment is ensured, but also channel quality of strong-receiver-capability user equipment is maintained by using an excellent interference suppression capability of the strong-receiver-capability user equipment.