Receiver Collision Detection and Parameter Adjustment

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Solution Overview

Problem

In wireless circuits, collisions between data packets can occur, causing corruption and loss of data packets, particularly in scenarios where receiving devices transmit at any time, leading to inefficiencies in data processing.

Innovation Solution

A receiver circuit with a collision detector that halts decoding of a first transmission, adjusts receive parameters, and enables detection of a preamble portion of a second transmission, improving reception sensitivity by frequency and phase locking to the colliding packet.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the receiver continues processing the first transmission without collision detection, then the decoding process is completed, but data corruption occurs when a second transmission collides

Engineering Contradiction:

Improvedata integrityVSAvoidprocessing time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The receiver performs preliminary collision detection during the reception of the first transmission by monitoring for the presence of a second transmission's preamble. This preliminary action allows the system to detect potential collisions before they complete, enabling timely halting of decoding and switching to receive the second transmission, thus preventing data corruption while minimizing processing time loss.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the receiver halts decoding to detect collision, then data corruption is prevented, but processing efficiency decreases

Engineering Contradiction:

Improvedata integrityVSAvoidprocessing efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The receiver performs partial collision detection by monitoring only specific portions of incoming signals (such as preamble detection) rather than fully processing the entire transmission. This partial action provides sufficient information to detect collisions and halt decoding when necessary, while avoiding the excessive processing that would significantly reduce productivity. The selective monitoring approach balances reliability with processing efficiency.

Inventive Principle:

Principle #16Partial or excessive action

3Device complexity

If the receiver uses fixed receive parameters, then the decoding process is simple, but reception sensitivity decreases when collisions occur

Engineering Contradiction:

Improvereceiver structureVSAvoidreception sensitivity

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The receiver dynamically adjusts its receive parameters based on collision detection results. When a collision is detected, the system switches from fixed decoding parameters to adjusted parameters optimized for receiving the colliding transmission. This dynamic adaptation improves reception sensitivity for collided packets while maintaining relatively simple fixed parameters for normal operation, thus balancing device complexity with measurement precision.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS9013975B2Receiver with collision detection and method therefor

Publication Date: 2015.04.21 SILICON LABORATORIES INC

AI summary

A method of handling a collision event between a first and second transmission includes detecting a collision event between the first and second transmissions while processing the first transmission at a receiver. The method further includes halting decoding of the first transmission in response to detecting the collision, adjusting receive parameters to receive the second transmission, and detecting a preamble portion of the second transmission using the adjusted receive parameters.