Transmission Power Normalization via Beam Forming Gain Lookup Table

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Solution Overview

Problem

Traditional beam forming techniques fail to account for automatic gain control in target devices, leading to an inaccurate view of the communication medium and degradation in beam-formed communication channel performance.

Innovation Solution

The implementation of transmission power normalization techniques using a beam forming gain lookup table to adjust the power of sounding frames, ensuring they approximate the power of beam-formed frames, thereby addressing automatic gain control and improving channel accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If traditional beam forming techniques are used without transmission power normalization, then the implementation is simpler, but the view of the communication medium becomes inaccurate due to automatic gain control effects

Engineering Contradiction:

Improveaccuracy of communication medium viewVSAvoidcomplexity of beam forming implementation

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by pre-calculating and storing beam forming gain values in a lookup table before actual beam forming operations. The gain values are computed based on simulated channel conditions and stored for later retrieval, eliminating the need for real-time complex calculations and allowing the system to compensate for automatic gain control effects without adding runtime complexity

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the transmission power parameter of sounding frames by applying gain values from the lookup table. This parameter adjustment compensates for automatic gain control effects at the target device, enabling accurate measurement of the communication medium characteristics while maintaining system simplicity through pre-computed correction factors

Inventive Principle:

Principle #35Parameter changes

2Reliability

If transmission power normalization is implemented to address automatic gain control, then the beam forming performance improves, but the implementation complexity increases

Engineering Contradiction:

Improvebeam forming performanceVSAvoidcomplexity of transmission power normalization

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent creates a simplified copy of the beam forming gain calculation by pre-computing gain values through simulation and storing them in a lookup table. Instead of performing complex real-time calculations, the system retrieves pre-computed gain values that copy the essential correction factors needed to compensate for automatic gain control, thereby improving reliability without significantly increasing implementation complexity

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent performs the complex gain calculation work in advance through simulation and stores results in a lookup table. This preliminary action shifts the computational burden from runtime operations to an initial setup phase, allowing the actual beam forming operations to use simple table lookups and maintain high reliability while keeping runtime complexity low

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS7620416B2Transmission power normalization

Publication Date: 2009.11.17 APPLE INC

AI summary

Embodiments of transmission power normalization are presented herein.