FSK Receiver Packet Detection Using Orthogonal Sync Words

Solution Overview

Problem

Conventional frequency-shift keying (FSK) receivers face challenges in accurately detecting packets in environments where multiple signals coexist, due to complex correlation operations and inaccuracy caused by automatic gain control, leading to increased implementation complexity and power consumption.

Innovation Solution

A frequency-shift keying signal receiver and method utilizing a multi-binary correlator that calculates correlation values using synchronization words with orthogonality or quasi-orthogonality, allowing for independent packet detection regardless of signal attenuation, and employing Exclusive OR (XOR) operations to simplify the detection process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional correlation operations are used for packet detection in multi-signal environments, then detection capability is maintained, but implementation complexity and power consumption increase

Engineering Contradiction:

Improvepacket detection capabilityVSAvoidimplementation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the packet structure into distinct synchronization words with orthogonal properties. By dividing the detection process into separate correlation operations for different synchronization words (e.g., first synchronization word for one signal type, second synchronization word for another signal type), the system can independently detect multiple signals without requiring complex multi-signal correlation algorithms, thus reducing implementation complexity while maintaining detection reliability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the parameter of synchronization words to have orthogonal or quasi-orthogonal properties. This parameter change enables the use of simpler correlation-based detection instead of complex multi-signal processing, as orthogonal sequences allow independent detection through basic correlation operations, thereby reducing both implementation complexity and power consumption while maintaining reliable packet detection

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If automatic gain control is used to handle signal attenuation, then detection range is extended, but detection accuracy deteriorates

Engineering Contradiction:

Improvedetection rangeVSAvoiddetection accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent extracts only the sign information from the frequency-demodulated signal for correlation operations, completely removing the need for automatic gain control. By taking out only the essential sign component and discarding amplitude information, the system achieves detection accuracy independent of signal attenuation, while still maintaining extended detection range through the correlation process itself

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces synchronization words with orthogonal properties as an intermediary between the transmitted signal and detection process. These synchronization words serve as reference patterns that enable accurate packet detection through correlation without requiring amplitude matching or automatic gain control, thus eliminating the trade-off between detection range and accuracy

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If complex correlation operations are performed for packet detection, then detection accuracy is maintained, but power consumption increases

Engineering Contradiction:

Improvedetection accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent extracts only the sign information from the frequency-demodulated signal for correlation operations, completely removing the need for automatic gain control. By taking out only the essential sign component and discarding amplitude information, the system achieves detection accuracy independent of signal attenuation, while still maintaining extended detection range through the correlation process itself

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the parameter of synchronization words to have orthogonal or quasi-orthogonal properties. This parameter change enables the use of simpler correlation-based detection instead of complex multi-signal processing, as orthogonal sequences allow independent detection through basic correlation operations, thereby reducing both implementation complexity and power consumption while maintaining reliable packet detection

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10523416B2Independent packet detection method using synchronization words with orthogonality and receiver therefor

Publication Date: 2019.12.31 ABOV SEMICON CO LTD

AI summary

A receiver performs independent packet detection using synchronization words with orthogonality when multiple signals on which frequency-shift keying is performed coexist. The receiver includes a frequency demodulator generating a quasi-amplitude modulation signal that has a value proportional to frequency shift from the first signal or second signal being received, a sign discriminator discriminating a sign of the generated quasi-amplitude modulation signal, and a multi-binary correlator calculating a first correlation value which is a binary correlation value between the discriminated sign and a first synchronization word and calculating a second correlation value which is a binary correlation value between the discriminated sign and a second synchronization word.