Group 248

From ECE Department Wiki

Contents 1 Background 2 Project Description 3 Members 4 Documents 5 Pictures

Background

Time reversed signal processing is the process of sending a signal over a channel in one direction, receiving that signal over an array of antennas, and then sending the reversed mirrored signal back out of the received array. This signal, in theory, will then take the exact same path back to the source as it took coming to the array, thus converging back at the source. The signal that is returned is an autocorrelated version of the original signal. Time reversal signal processing is an effective way to obtain measured data and improve system performance. Some of the applications that have used this theory are lithotripsy (the blasting of kidney stones), underwater communications, and broadband wireless data transfer.

Project Description

This website will cover the process taken to develop a daughter card for a Spectrum Digital TMS320C6416 Digital Signal Processor Starter Kit (DSK). The purpose of the card is to provide a means for time reversal and processing of signals. It has been designed to allow the researcher to capture two high frequency channels or two composite channels made up of several low frequency signals modulated on separate carriers. Regardless of the type of signal that is sent in, the daughter card will digitize it so that it may be time reversed and processed by the Digital Signal Processor or DSP. Once the DSP has finished with the signal, it can then be transmitted back out using the daughter card. The DSK will interface the daughter card using its built-in External Memory Interface (EMIF). The daughter card will be connected to an application specific card, which has not yet been created. The additional card will contain filter and amplification blocks.

Members

Students

(left to right)

• Jon Blixt
• Kurt Pulczinski
• David Hinkemeyer

Advisor

• David Farden

Documents

• TRDSP Final Schematic

• Technical Document

• User's Guide

Pictures

Jon hand soldering components onto the board.

The Analog to Digital Converter has a pad under the chip that needs to be soldered to the board.

Jon is using a heat gun to melt the 64 pin component to the board while keeping the pins aligned.

Dave is working on the code that will be loaded onto the Digital Signal Processor (DSP).

This is the daughter card that we designed.

This is the Digital Signal Processor Development Kit (DSK) that the daughter card was design for.