Articles

March 9, 2020

Orthogonal Directional Transforms Using Discrete Directional Laplacian Eigen Solutions for Beyond HEVC Intra Coding

We introduce new transforms for efficient compression of image blocks with directional preferences. Each transform, which is an orthogonal basis for a specific direction, is constructed from an eigen-decomposition of a discrete directional Laplacian system matrix.

By [email protected]

Read More >

December 10, 2019

Transmit-Receive Cross-modulation Distortion Analysis in Full Duplex Quadrature Balanced Wireless Transceivers

This paper presents an analysis of the nonlinear interaction between the transmit (TX) and receive (RX) signals in a quadrature balanced full duplex wireless transceiver system. A nonlinear analysis is conducted to describe the inband third-order distortion experienced by the...

By [email protected]

Read More >

November 13, 2019

A Full-Duplex Quadrature Balanced RF Front End With Digital Pre-PA Self-Interference Cancellation

This article presents a quadrature balanced radio-frequency (RF) front-end transmitter (TX) architecture assisted by a digital self-interference cancellation (SIC) algorithm for simultaneous transmission and reception in next-generation full-duplex radios.

By [email protected]

Read More >

November 4, 2019

Pre-PA Delay-Line Based FIR Filter for Self-Interference Cancellation in Full Duplex Wireless Systems

In this paper we propose a pre-PA self-interference (SIC) cancellation FIR filter architecture implemented in a quadrature balanced PAs (QBPA) transmitter (TX) for full duplex wireless applications. Pre-PA SIC filter allows for flexible and efficient equalization of the cancellation signal...

By [email protected]

Read More >

August 26, 2019

A 5GHz to 6GHz CMOS transmitter for full-duplex wireless with wideband digital cancellation

This paper presents a quadrature balanced transmitter, assisted by a digital equalization and predistortion self-interference cancellation technique for Full-Duplex wireless applications. An analysis of design trade-offs between low receiver (Rx) loss and high transmitter (Tx) efficiency is laid out and...

By [email protected]

Read More >

July 31, 2019

AM-PM: Efficient Network Telemetry using Alternate Marking

The fast evolution of high-speed networks has raised the need for accurate and scalable network measurement. Thus, in the last few years several new methods to collect network state information have been pursued by network operators and vendors across the...

By [email protected]

Read More >

July 25, 2019

A simultaneous transmit-receive quadrature balanced RF front-end with wideband digital self interference cancellation

This paper presents a quadrature balanced RF Front-End transceiver architecture and a digital self-interference cancellation (SIC) algorithm for simultaneous transmit-receive (Tx-Rx) in next generation half-duplex and full-duplex radios. Tx-Rx isolation of >57dB is measured for CW signals over 80MHz BW,...

By [email protected]

Read More >

June 6, 2019

Transceiver Architectures for Full Duplex Systems with Unmatched Receiver

In this paper, we present an overview of both the challenges and the state-of-the-art in full duplex (FD) integrated transceivers in terms of loss and noise. New circuit concept is presented for mismatched receiver design with a cancelling path. An...

By [email protected]

Read More >

May 22, 2019

Time-multiplexed parsing in marking-based network telemetry

Network telemetry is a key capability for managing the health and efficiency of a large-scale network. Alternate Marking Performance Measurement (AM-PM) is a recently introduced approach that accurately measures the packet loss and delay in a network using a small...

By [email protected]

Read More >