Differential Detection Unit for Low Power Communication Systems

Solution Overview

Problem

Existing data transmission systems, such as those in ZigBee communication systems according to IEEE 802.15.4, face challenges in achieving high detection efficiency with low power consumption and simplicity, especially in environments with interference and noise.

Innovation Solution

A detection unit that generates derived sequences through logic operations on PN sequences, allowing differential demodulation and correlation to accurately detect data symbols with low error rates, implemented in a transmitting/receiving device and integrated circuit.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If coherent detection is used to detect data symbols, then detection accuracy is improved, but device complexity and power consumption increase

Engineering Contradiction:

Improvedetection accuracyVSAvoiddevice complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent inverts the conventional coherent detection approach by using incoherent differential detection. Instead of converting the received signal to complex envelope form using coherent demodulation, the patent directly processes the in-phase and quadrature components through differential operations. This inversion of the detection paradigm eliminates the need for complex carrier recovery circuits while maintaining detection capability through differential symbol comparison.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent extracts only the essential detection function from the coherent detection process. By removing the carrier recovery and complex envelope conversion stages, the patent retains only the core signal comparison operation. This extraction simplifies the receiver structure to essential components: in-phase and quadrature component processors, differential delay elements, and decision logic, eliminating unnecessary complexity.

Inventive Principle:

Principle #2Taking out (Extraction)

2Measurement precision

If coherent detection with carrier control circuit is used, then detection accuracy is improved, but power consumption increases

Engineering Contradiction:

Improvedetection accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent inverts the conventional coherent detection approach by using incoherent differential detection. Instead of converting the received signal to complex envelope form using coherent demodulation, the patent directly processes the in-phase and quadrature components through differential operations. This inversion of the detection paradigm eliminates the need for complex carrier recovery circuits while maintaining detection capability through differential symbol comparison.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent extracts only the essential detection function from the coherent detection process. By removing the carrier recovery and complex envelope conversion stages, the patent retains only the core signal comparison operation. This extraction simplifies the receiver structure to essential components: in-phase and quadrature component processors, differential delay elements, and decision logic, eliminating unnecessary complexity.

Inventive Principle:

Principle #2Taking out (Extraction)

3Object-affected harmful factors

If PN sequences are used for spreading, then anti-interference capability is improved, but detection complexity increases

Engineering Contradiction:

Improveanti-interference capabilityVSAvoiddetection complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent inverts the conventional coherent detection approach by using incoherent differential detection. Instead of converting the received signal to complex envelope form using coherent demodulation, the patent directly processes the in-phase and quadrature components through differential operations. This inversion of the detection paradigm eliminates the need for complex carrier recovery circuits while maintaining detection capability through differential symbol comparison.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent extracts only the essential detection function from the coherent detection process. By removing the carrier recovery and complex envelope conversion stages, the patent retains only the core signal comparison operation. This extraction simplifies the receiver structure to essential components: in-phase and quadrature component processors, differential delay elements, and decision logic, eliminating unnecessary complexity.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS8477829B2Differential detection a communication system

Publication Date: 2013.07.02 ATMEL CORP

AI summary

In one embodiment, a detection unit includes a sequence providing unit to provide a third group of derived sequences. The third group for each first pseudo noise (PN) sequence has a derived sequence assigned to the first PN sequence. The detection unit includes a correlation unit, which is connected to the sequence providing unit and formed to calculate correlation results by correlating the differentially demodulated signal with each derived sequence of the third group. The detection unit includes an evaluation unit, which is connected to the correlation unit and is formed to derive the values of the data symbols by evaluating the correlation results.