Distortionless UWB Antenna

Description
Ultra wideband (UWB) radio technology requires low power, offers high bandwidth efficiency, and is difficult to detect in covert applications compared to narrowband. It is used in radar imaging applications such as through-wall imaging, in internal medical diagnostics, environmental and weather monitoring, and security-related target tracking. Current UWB technologies rely on antennas that significantly distort […]

A Novel and Improved OFDM System

Description
The growing demand for high-speed wireless communications has prompted the development of higher performance technologies. A key technology that promises to deliver higher data capacity and greater spectral efficiency required by these communication systems is Orthogonal Frequency-Division Multiplexing (OFDM). OFDM is an enhanced technique that transmits information using multiple carriers that are compressed together in […]

Zonal UWB Receiver

 
Description
An ultra-wideband (UWB) receiver is a short range wireless communications technology currently gaining popularity for use with personal area networking (PAN) applications such as wireless monitors, camcorders, and other high bandwidth devices.  UWB utilizes a very large frequency range in order to drastically increase the available bandwidth without interfering with existing traditional communications devices, even […]

Non-Repeating Interval Sequences for Coded Imaging and Multi-User Communications

Description
Coded excitation is widely used in ultrasound, radar, sonar and other imaging systems as well as in communication systems. Coded excitation involves the transmission of long-duration pulses with a time-bandwidth product (TBP) greater than 1. By coding the pulse on transmission, the received signals may be processed to compress (decode) the effective impulse response, and […]

Overhead & Complexity Optimized Network Coding for Improved Network Performance

Description
Communication and data transfer over the internet is driven by speed and the ability to provide uninterruptable high quality services. Conventional network broadcast/multicast protocols are either unreliable (e.g. user datagram protocol- UDP) or rely significantly on control or feedback messages (e.g. transmission control protocol- TCP, pragmatic general multicast- PGM) incurring a great deal of overhead […]

Novel Small-Area Low-Power Analog to Digital Converter for In-Pixel Data Conversion

Description
Most image sensors incorporate one analog-to-digital converter (ADC) per pixel array, or per column, to process a photodiode’s sensitive signal. The next generation of products aims to incorporate one ADC per pixel, which can result in higher contrast range and resolution, as well as sensitivity. The main challenge in pixel-level data conversion is producing a […]

New Optimized Receiver for Pilot Symbol Assisted Modulation (PSAM)

Description
Pilot Symbol Assisted Modulation is a wireless communications method for reducing the effects of a fading signal. By periodically inserting known ‘pilot’ symbols into a transmitter’s data stream, a receiver is able to derive an estimation of a fading channel’s amplitude and phase reference. This channel gain estimate allows the receiver to compensate for fading, […]

Low Loss Meta-Material Optical Waveguides

Description
The researchers at the University of Alberta have developed a new class of optical waveguides with a meta-material cladding which enables strong confinement of energy within the waveguides making it an ideal choice for Photonic Integrated Circuits (PIC) and optical communication systems. Unlike many other existing approaches, the current approach does not suffer from propagation […]

Fast, Low-Power Decoders for LDPC Codes

Description
Low-density parity-check (LDPC) codes are used in communications technologies to successfully send a message over a noisy channel. These codes come much closer to the theoretical maximum transmission rate than other methods. Unfortunately the conventional (logarithm likelihood ratio or LLR) message scheme of LDPC decoders requires complex algorithms involving time, power, and memory intensive hyperbolic […]

Easily Fabricated Hollow Optical Waveguides Including Tapers

Description
Optical waveguides are devices that guide electromagnetic waves along a desired path, and with a minimum of loss from the generating point to the point of application. Air-core (hollow) optical waveguides enable controlled interaction between an optical beam and a gaseous or liquid medium, and thus have tremendous potential for applications in the telecommunications, computing, […]