Predefined Spatial Mapping Matrices for MIMO Beamforming Overhead Reduction

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Traditional MIMO wireless communication systems incur system overhead and sacrifice throughput due to the need for explicit channel state information (CSI) through sounding procedures, which limits the effective communication range and efficiency of beamforming techniques.

Innovation Solution

The use of predefined spatial mapping matrices in a codebook allows for beamforming without channel training, where data packets themselves act as sounding packets, enabling the selection of optimal spatial mapping matrices based on reception quality, thereby increasing the effective transmission range and reducing system overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional explicit beamforming with sounding procedures is used, then channel state information is obtained for beamforming, but system overhead increases and throughput is sacrificed

Engineering Contradiction:

Improvechannel state information accuracyVSAvoidsystem throughput

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent combines the sounding packet transmission with regular data packet transmission by using the same spatial mapping matrices from the codebook for both purposes. This merging eliminates the need for separate sounding procedures while still enabling the receiver to determine reception quality for each spatial mapping matrix, thereby maintaining channel state information accuracy without sacrificing system throughput.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent makes data packets serve multiple functions: they act as both the transmission medium for user data and as sounding packets for channel state estimation. By using predefined spatial mapping matrices from a shared codebook, the system enables receivers to evaluate reception quality for beamforming selection without requiring dedicated sounding resources, thus achieving multi-functionality that resolves the throughput-overhead contradiction.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If traditional sounding procedures are performed before beamforming, then beamforming can be implemented, but transmission delays occur and effective communication range is limited

Engineering Contradiction:

Improvebeamforming effectivenessVSAvoidtransmission delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent enables continuous data transmission without interruption for separate sounding procedures. By using predefined spatial mapping matrices from a codebook that are already available at both transmitter and receiver, the system eliminates the need for pause-based channel training, allowing beamforming to be implemented continuously alongside data transmission, thereby reducing transmission delays while maintaining beamforming effectiveness.

Inventive Principle:

Principle #20Continuity of useful action

3Productivity

If predefined spatial mapping matrices from a shared codebook are used, then channel training is eliminated and throughput is improved, but the ability to adapt to channel conditions may be reduced

Engineering Contradiction:

Improvedata transmission throughputVSAvoidchannel adaptation capability

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent implements a feedback mechanism where the receiver evaluates the reception quality for each predefined spatial mapping matrix from the shared codebook and feeds back this information to the transmitter. This feedback enables the transmitter to adaptively select the optimal spatial mapping matrix based on actual channel conditions, thereby maintaining adaptability while using the simplified predefined matrices that improve throughput.

Inventive Principle:

Principle #23Feedback

4Reliability

If explicit beamforming with separate sounding packets is used, then channel state information is obtained, but system overhead and complexity increase

Engineering Contradiction:

Improvechannel state informationVSAvoidsystem overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the sounding function into regular data packet transmission by using the same spatial mapping matrices from a shared codebook for both data transmission and channel estimation. This eliminates the need for separate sounding packets and the associated overhead and complexity, while still enabling the receiver to determine reception quality for each spatial mapping matrix to support beamforming decisions.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS10200096B2Beamforming using predefined spatial mapping matrices

Publication Date: 2019.02.05 VELOCITY COMMUNICATION TECHNOLOGIES LLC

AI summary

In one or more aspects data packets are transmitted to a receiver using predefined spatial mapping matrices, a quality of reception is received from the receiver for each of the predefined spatial mapping matrices, and one of the predefined spatial mapping matrices is selected for transmitting additional data packets to the receiver based on a highest quality of reception.