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Related Concept Videos

Design Example01:23

Design Example

The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
Receiver Operating Characteristic Plot01:15

Receiver Operating Characteristic Plot

A ROC (Receiver Operating Characteristic) plot is a graphical tool used to assess the performance of a binary classification model by illustrating the trade-off between sensitivity (true positive rate) and specificity (false positive rate). By plotting sensitivity against 1 - specificity across various threshold settings, the ROC curve shows how well the model distinguishes between classes, with a curve closer to the top-left corner indicating a more accurate model. The area under the ROC curve...
Bandpass Sampling01:17

Bandpass Sampling

In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2. The spectrum...
Aliasing01:18

Aliasing

Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original signal...
Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
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Standing Electromagnetic Waves01:15

Standing Electromagnetic Waves

Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
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Related Experiment Video

Updated: May 13, 2026

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements
09:36

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

Published on: June 25, 2021

Ultra-wideband communication system prototype using orthogonal frequency coded SAW correlators.

Daniel R Gallagher1, Nikolai Y Kozlovski, Donald C Malocha

  • 1College of Electrical Engineering and Computer Science, University of Central Florida, Orlando, FL, USA. danielgallagher@ieee.org

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|March 12, 2013
PubMed
Summary
This summary is machine-generated.

This study demonstrates a novel ultra-wideband (UWB) communication system using orthogonal frequency coded (OFC) SAW correlators. This approach simplifies hardware and enhances performance for UWB transceivers.

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Area of Science:

  • Electrical Engineering
  • Communications Engineering
  • Signal Processing

Background:

  • Ultra-wideband (UWB) communication systems offer high data rates but require efficient signal processing and spectral spreading.
  • Traditional UWB systems often involve complex and costly intermediate frequency (IF) components.
  • Orthogonal frequency coding (OFC) and pseudo-noise (PN) coding are explored for spread-spectrum UWB to enhance correlation gain and code diversity.

Purpose of the Study:

  • To present preliminary results of an UWB communication system utilizing orthogonal frequency coded Surface Acoustic Wave (SAW) correlators.
  • To demonstrate the feasibility of using SAW correlators to simplify UWB transceiver design and reduce signal processing requirements.
  • To evaluate the performance of an experimental UWB prototype system incorporating OFC SAW correlators.

Main Methods:

  • Development of an experimental UWB prototype system with a 250 MHz center frequency using modular RF components.
  • Design of SAW correlation filters using 7 chip frequencies and a fractional bandwidth of approximately 29% to meet UWB specifications.
  • Configuration and testing of the prototype system in both wired and wireless setups, comparing autocorrelation and cross-correlation outputs.

Main Results:

  • The prototype system successfully generated spread-spectrum UWB signals using OFC-coded SAW filters.
  • Matched filter correlation reception was achieved, demonstrating effective signal recovery.
  • Comparison of autocorrelation and cross-correlation outputs validated the system's performance.
  • The use of SAW correlators eliminated costly IF components and reduced signal processing complexity.

Conclusions:

  • The developed UWB system using OFC SAW correlators demonstrates a viable and simplified approach for UWB communication transceivers.
  • SAW correlators offer a cost-effective solution by reducing hardware complexity and signal processing demands.
  • The results confirm the feasibility of OFC-coded SAW correlators for future UWB applications.