Wireless Base Station Transmit Weight Selection for Spatial Multiplexing

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Solution Overview

Problem

Conventional wireless base station devices face challenges in efficiently managing spatial correlation coefficients between terminals, leading to increased processing delays and complexity in spatial division multiplexing transmission due to varying propagation environments.

Innovation Solution

The implementation of a wireless base station device with transmit weight generation sections, a beam selection section, and a transmit beam formation section, which generate and select optimal transmit weights based on different algorithms to simplify the allocation process and enhance spatial division multiplexing transmission robustness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the wireless base station device detects and updates the spatial correlation coefficient frequently to adapt to changing propagation environments, then the spatial division multiplexing transmission can maintain robustness, but the processing delay increases and system complexity increases

Engineering Contradiction:

Improvespatial division multiplexing transmission robustnessVSAvoidprocessing delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent pre-stores multiple transmit weight generation algorithms in the base station device before actual transmission occurs. When spatial division multiplexing is needed, the system selects from pre-available algorithms rather than computing weights in real-time, thereby reducing processing delay while maintaining adaptation to changing propagation environments.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically selects which transmit weight generation algorithm to use based on current channel conditions and spatial correlation characteristics. This dynamic algorithm selection allows the system to adapt to varying propagation environments without requiring frequent re-computation of transmit weights, thus reducing processing delay while maintaining transmission robustness.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If the wireless base station device frequently detects and updates the spatial correlation coefficient to maintain optimal transmission, then the system can adapt to changing propagation environments, but the device complexity increases

Engineering Contradiction:

Improveadaptation to propagation environment changesVSAvoiddetection and allocation process complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Multiple transmit weight generation algorithms are pre-stored in the base station device before actual transmission occurs. This preliminary preparation eliminates the need for complex real-time detection and computation processes, reducing device complexity while maintaining the ability to adapt to changing propagation environments through algorithm selection.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system changes the operating parameter from continuous real-time computation of transmit weights to discrete selection from pre-stored algorithms. This parameter change simplifies the detection and allocation processes while maintaining adaptability to propagation environment changes through algorithm switching based on spatial correlation characteristics.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If conventional allocation processes are used based on spatial correlation coefficient detection, then the system can perform spatial division multiplexing, but the processing time required for control increases

Engineering Contradiction:

Improvesystem capacityVSAvoidprocessing time for spatial division multiplexing control

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

Transmit weight generation algorithms are pre-computed and stored before actual transmission occurs. This preliminary action eliminates time-consuming real-time computations during the control process, reducing processing time for spatial division multiplexing control while maintaining high system capacity through efficient algorithm selection.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces the mechanical process of real-time transmit weight computation with a selection process from pre-stored algorithms. This substitution significantly reduces processing time for spatial division multiplexing control while maintaining productivity through efficient algorithm-based weight generation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS8755358B2Wireless base station device, terminal, and wireless communication method

Publication Date: 2014.06.17 PANASONIC HOLDINGS CORP

AI summary

A wireless base station device includes a plurality of transmit weight generation sections and a beam selection section. The transmit weight generation sections generate pieces of transmit weight information used for spatial division multiplexing transmission according to different algorithms. The pieces of transmit weight information are generated based on channel information on a plurality of terminals each having one or more antennas with which the wireless base station device performs spatial division multiplexing transmission. The beam selection section selects one of the pieces of transmit weight information generated.