Self-Correlation Receiver Using Clamping to Cancel Leakage Noise

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Solution Overview

Problem

In wireless communication systems where a transmitter and receiver share an antenna, existing solutions like isolators or circulators increase the form factor and production cost, and fail to effectively reduce noise and dynamic range requirements due to leakage signals, leading to increased noise and reduced receive sensitivity.

Innovation Solution

A self-correlation receiver is implemented, which includes a clamper to limit the magnitude of received signals and a mixer to produce a difference frequency signal, utilizing the transmitter signal as a local oscillator to eliminate phase noise-induced noise without external elements, and a quadrature transceiver with phase shifters to maintain receive sensitivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If an isolator or circulator is used between transmitter and receiver, then leakage signal is reduced, but device complexity and production cost increase

Engineering Contradiction:

Improveleakage signalVSAvoiddevice complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent extracts and removes the isolator/circulator from the system by implementing a self-correlation receiver that uses signal processing to eliminate leakage signals without requiring these external isolation devices

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The receiver uses its own transmitted signal as a reference (self-correlation) to identify and remove leakage components, making the system self-sufficient without external isolation devices

Inventive Principle:

Principle #25Self-service

2Object-affected harmful factors

If an isolator is used to reduce leakage signal, then receiver saturation is prevented, but form factor and system area increase

Engineering Contradiction:

Improvereceiver saturationVSAvoidsystem area

Core Design Contradiction:

Object-affected harmful factorsVSArea of stationary object

Solution Approach 1:

The isolator is extracted from the physical system and replaced with a signal processing function implemented in the self-correlation receiver, eliminating the need for additional physical components that would increase system area

Inventive Principle:

Principle #2Taking out (Extraction)

3Object-affected harmful factors

If isolator performance is improved to reduce leakage, then production cost rises, but leakage signals still cause noise

Engineering Contradiction:

Improveleakage signal magnitudeVSAvoidnoise

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful leakage signal into a useful reference by using the transmitted signal itself as a correlation reference, allowing the receiver to identify and remove leakage components while simultaneously using the same signal for desired reception functions

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The receiver performs its own isolation function by using signal processing techniques to identify and eliminate leakage signals, making the system self-sufficient without external isolation devices that generate noise

Inventive Principle:

Principle #25Self-service

4Extent of automation

If common local oscillator is used for transmitter and receiver, then phase noise difference increases, but PN-induced noise increases

Engineering Contradiction:

Improvecommon local oscillatorVSAvoidPN-induced noise

Core Design Contradiction:

Extent of automationVSObject-generated harmful factors

Solution Approach 1:

The receiver uses its own transmitted signal (which contains the phase noise characteristics) as a correlation reference, automatically compensating for phase noise differences without requiring separate local oscillators

Inventive Principle:

Principle #25Self-service

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution reduces noise and improves receiver performance by eliminating phase noise-induced noise and maintaining receive sensitivity, while integrating the functionality without external devices, thus enhancing the overall efficiency and cost-effectiveness of the transceiver system.

Implementation Method 1

a clamper which receives a received signal, limits the magnitude of the received signal within a predetermined range and outputs a clamping signal

Methodology Applied

Scientific EffectClamping:

Implementation Method 2

a mixer which receives the received signal and the clamping signal and outputs a signal having a difference frequency between the received signal and the clamping signal

Methodology Applied

Scientific EffectFrequency mixing:

Data Source

PatentUS20120294337A1Self-correlation receiver and transceiver including the same

Publication Date: 2012.11.22 INTELLECTUAL DISCOVERY CO LTD

AI summary

Disclosed is a self-correlation receiver of a transceiver in which a transmitter shares an antenna with a receiver. The self-correlation receiver includes: a clamper which receives a received signal, limits the magnitude of the received signal within a predetermined range and outputs a clamping signal; and a mixer which receives the received signal and the clamping signal and outputs a signal having a difference frequency between the received signal and the clamping signal.