Transmit Chain Codebook for Radiation Exposure Reduction

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Solution Overview

Problem

Portable wireless devices with multiple transmit chains face challenges in reducing user exposure to electromagnetic radiation while maintaining good reception quality, as existing methods struggle to comply with regulatory limits without sacrificing output power.

Innovation Solution

The method involves adjusting the phase or amplitude of transmit chains based on a codebook generated using parameters that characterize near-field electromagnetic radiation intensity, ensuring radiation levels remain below safe thresholds while maintaining quality of reception at the intended receiver.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple transmit chains operate simultaneously at high power, then transmission quality and data rate are improved, but electromagnetic radiation exposure increases

Engineering Contradiction:

Improvetransmission qualityVSAvoidelectromagnetic radiation exposure

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the transmission power across multiple transmit chains by activating only a subset of chains at a time rather than all chains simultaneously. This is achieved through codebook-based selection where each code word specifies which transmit chains to activate, thereby dividing the total power exposure while maintaining transmission quality through selective chain activation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent dynamically adjusts which transmit chains are active based on the transmitted data and selected code word. The system transitions between different transmit chain configurations in real-time, allowing the device to adapt the radiation exposure profile to match the actual transmission requirements, thus reducing unnecessary exposure while maintaining quality.

Inventive Principle:

Principle #15Dynamics

2Object-affected harmful factors

If radiation exposure is reduced by lowering transmit power, then regulatory compliance is achieved, but transmission quality and data rate deteriorate

Engineering Contradiction:

Improveradiation exposureVSAvoiddata rate

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent applies partial action by activating only the necessary subset of transmit chains required for the transmission task rather than all available chains. This partial activation reduces the total radiation exposure while maintaining sufficient transmission power for acceptable data rates, avoiding the excessive action of activating all chains simultaneously.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent changes the operational parameters of the transmit chains by selecting different chains and power levels based on the code word. This parameter adjustment allows the system to operate at lower total power levels while maintaining transmission quality, thereby reducing radiation exposure without sacrificing data rate performance.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If all transmit chains are activated to maintain output power, then transmission reliability is improved, but compliance with radiation thresholds becomes difficult

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidradiation compliance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the transmit chains into active and inactive sets based on the code word selection. By activating only the necessary subset of chains, the system maintains transmission reliability through coherent combining of signals from active chains while reducing the total radiation exposure to comply with regulatory thresholds.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent incorporates feedback mechanisms where the system monitors transmission quality and adjusts the code word selection accordingly. This feedback loop ensures that the subset of activated chains maintains sufficient transmission reliability while keeping radiation exposure within compliance limits, allowing dynamic adaptation to channel conditions.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS8929828B2Method of coding using multiple transmit chains for reduced exposure to electromagnetic radiation

Publication Date: 2015.01.06 HOCHWALD BERTRAND M

AI summary

Embodiments of methods and apparatuses for transmission from an electromagnetic signal transmitting device utilizing a plurality of transmit chains based on a code that reduces exposure to electromagnetic radiation. One method is utilizing a plurality of chains, adjusting at least one of a phase or an amplitude of at least one of the transmit chains based on a code, wherein the codebook of code words is generated using at least one parameter that characterizes the electromagnetic radiation intensity, and wherein the number of code words satisfies a criterion for quality of reception at an intended receiver, and wherein the code words are selected, during operation of the transmitting device, in response to data that are to be transmitted.