Adaptive Code Book for Multi-Stage Beam Forming

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Solution Overview

Problem

In multi-stage beam forming systems, conventional methods struggle to provide adaptive design of the code book for digital beam forming, which is essential for considering the operational conditions of both analog and digital beam forming stages, leading to limited channel information feedback and inefficient communication.

Innovation Solution

A method and apparatus that determine statistical channel information to prioritize analog beams, configure an adaptive code book for digital beam forming, and perform communication using this adaptive code book, considering the channel estimation and operational conditions of both stages.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional code book design is used for digital beam forming, then the system operates with a fixed code book structure, but it cannot adapt to the operational conditions of analog beam forming and provides limited channel information feedback

Engineering Contradiction:

Improveadaptability of code book to channel environmentVSAvoidcomplexity of code book configuration

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The code book is designed to be dynamic rather than static. The transmitter configures the code book adaptively based on statistical channel information obtained from the receiver, allowing the code book structure to change according to actual channel conditions and analog beam forming operations

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system implements a feedback mechanism where the receiver measures channel information and feeds it back to the transmitter. The transmitter uses this statistical channel information to configure an adaptive code book, creating a closed-loop system that continuously adapts to channel variations

Inventive Principle:

Principle #23Feedback

2Device complexity

If the number of radio frequency chains is small compared to the number of antennas, then the system reduces hardware complexity, but it becomes very difficult to obtain channel information on all antennas of the analog stage

Engineering Contradiction:

Improvenumber of radio frequency chainsVSAvoidchannel information on analog antennas

Core Design Contradiction:

Device complexityVSLoss of information

Solution Approach 1:

The patent introduces statistical channel information as an intermediary representation. Instead of requiring direct channel information from all analog antennas, the system uses statistical characteristics derived from a subset of measurements to represent the overall channel state, enabling code book configuration without full channel knowledge

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system creates a statistical copy or representation of the channel information rather than requiring complete original channel data. The receiver measures channel characteristics and provides statistical information that captures the essential properties needed for digital beam forming without needing all antenna details

Inventive Principle:

Principle #26Copying

3Productivity

If analog beam forming is operated prior to digital beam forming, then the system enables multi-stage beam forming, but the digital beam forming cannot consider the operational condition of the front-end analog beam forming

Engineering Contradiction:

Improvebeam forming performanceVSAvoidconsideration of analog beam operating condition

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The system performs preliminary measurement of statistical channel information that reflects the analog beam forming operation conditions. This preliminary information is then used to configure the digital code book, allowing the digital stage to adapt to the front-end analog conditions

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The receiver measures and feeds back statistical channel information that characterizes the analog beam forming operational conditions. This feedback enables the transmitter to configure the digital code book in consideration of how the analog stage is operating, creating coordinated multi-stage beam forming

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS9356809B2Method and apparatus for performing communication in multi-stage beam forming system

Publication Date: 2016.05.31 SAMSUNG ELECTRONICS CO LTD

AI summary

A method for performing communication in a multi-stage beam forming system includes determining statistical channel information which indicates a priority of analog beams transmitted by a base station, configuring an adaptive code book for digital beam forming, based on the statistical channel information and analog beams which the base station uses in actual communication among the analog beams, and performing communication with the base station through the digital beam forming based on the adaptive code book. A terminal includes a channel estimator configured to perform channel estimation for analog beams transmitted from a base station, a controller configure to determine statistical channel information indicating a priority of the analog beams, and configure an adaptive code book for digital beam forming based on the statistical channel information and analog beams that the base station uses in actual communication among the analog beams, and a communication unit.