For hands-free, untethered full-duplex speech communication at the human-machine interface, the acoustic feedback from the loudspeaker(s) to the microphone(s) has to be suppressed. Following the analysis of the problem, the basic concept of acoustic echo cancellation is reviewed. Typical adaptation algorithms are discussed and adaptation control as well as computationally efficient filtering sc...

This paper describes the design of Universal Asynchronous Receiver and Transmitter (UART) using VHDL. A UART is a full duplex receiver/transmitter. It is the microchip with programming that controls a computer's interface to its attached serial devices. It handles the conversion between serial and parallel data. It is the most widely used serial data communication circuit ever. Whole process of...

Cdma2000 is an international standard of the third generation wireless communication system, which is still widely used today. In our project, we attempt to apply this standard in spatial modulated full duplex (SMFD) system, which aims to test a novel self-interference (SI) cancellation method in digital domain. The SMFD system and the proposed SI cancellation scheme are both introduced in grea...

Data exchange with strong data transmission time guarantees is necessary in the internal communication of an aircraft. The Avionics Full Duplex Switched Ethernet (AFDX) has been developed for this purpose. Its design is based on the principle of a switched network with physically redundant links to support availability. It should also be tolerant to transmission and link failures in the network...

A key component for hands-free, full-duplex, communication technology is the echo canceler. An echo canceler consists primarily of an adaptive 4lter and a control device called the double-talk detector. We derive a test statistic based on a normalized cross-correlation vector for the multichannel frequency-domain adaptive algorithm. The advantages of this approach are: low computational complex...

This paper presents work on a switched Ethernet network extended to allow for periodic real-time traffic, using earliest deadline first (EDF) scheduling. A scheme of asymmetrically dividing deadlines of real-time channels between the in and outgoing links to/from the switch is proposed (ADPS). The result of the simulations of setting up RT channels over a full-duplex switched Ethernet network i...