Wireless Beam Selection for Multi-User MIMO Reception
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Solution Overview
Problem
In multi-user MIMO transmission, wireless base stations face challenges in improving reception quality due to thermal noise from fixed beams, which can have varying reception levels for different wireless terminals, leading to reduced signal detection accuracy.
Innovation Solution
A wireless apparatus that includes a first weight multiplication part, channel estimation part, metric computation part, beam selection part, and signal detection part to select and use optimal beams for signal detection, reducing thermal noise and enhancing reception quality by computing and applying second weights based on channel responses and metrics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If all fixed beams are used to receive radio signals from multiple wireless terminals, then signals from any incoming direction can be received, but thermal noise from individual fixed beams affects signal detection and reduces reception quality
Solution Approach 1:
The patent segments the set of all fixed beams into a subset of selected beams based on channel response quality. Instead of using all available fixed beams for signal detection, the system divides them and selects only those beams that provide adequate channel response, thereby reducing thermal noise while maintaining coverage capability.
Solution Approach 2:
The patent applies local quality by evaluating and selecting beams based on their individual channel response characteristics for each wireless terminal. Each beam is assessed locally according to its specific performance metrics (channel response quality, signal-to-noise ratio), and only beams meeting quality thresholds are selected for use in signal detection.
2Reliability
If a fixed beam with high reception level is selected for a certain wireless terminal, then reception quality for that terminal improves, but the same beam may have low reception level for different wireless terminals, reducing overall system performance
Solution Approach 1:
The patent implements dynamic beam selection by evaluating channel responses for each wireless terminal individually and selecting beams adaptively based on current channel conditions. The beam selection is not fixed but dynamically adjusted according to the specific needs of each terminal, allowing the system to optimize reception quality for each terminal while maintaining overall system adaptability.
Solution Approach 2:
The patent changes the selection criteria parameter from fixed beam assignment to dynamic selection based on channel response quality metrics. By adjusting the selection parameters (signal-to-noise ratio thresholds, channel response quality measures), the system can optimize performance for different terminal configurations and channel conditions.
3Loss of information
If fixed beams are used for channel estimation, then channel response can be obtained, but thermal noise components reduce estimation accuracy
Solution Approach 1:
The patent applies preliminary action by performing channel estimation using selected high-quality beams before signal detection. The system pre-evaluates beam quality metrics and selects appropriate beams for channel estimation, ensuring that the channel response information is obtained with minimal thermal noise contamination before the actual signal detection process begins.
Data Source
AI summary
A wireless apparatus multiplies, by a first weight corresponding to each of a plurality of beams, a received signal corresponding to a reference signal transmitted from each of wireless terminals, estimates a channel response associated with each of the beams, computes a predetermined metric for each combination of beams to be used, selects the beams to be used when performing signal detection with respect to a received signal into which radio signals transmitted from the wireless terminals are spatially multiplexed based on the predetermined metric, determines a second weight to be used for the signal detection and multiplies, by the second weight, the received signal into which radio signals transmitted from the wireless terminals are spatially multiplexed to perform the signal detection.