- Role of Digital Signal Processing in Embedded System

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SEMINARSEMINAR

Role of Digital Signal Processing inRole of Digital Signal Processing in

Embedded SystemEmbedded System



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What is a DSP?What is a DSP?

A DSP is designed for performing mathematical functions like "add", "subtract","multiply" and "divide" very quickly.

All of this occurs at very high speeds.

Diagram below shows how a DSP is used in an MP3 audio player .

DSP would perform other functions such as volume control, equalization and user

interface.

Although real-world signals can be processed in their analog form, processing signals

digitally provides the advantages of high speed and accuracy.

DSP can be used in a wide variety of applications.



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What's Inside a DSP?What's Inside a DSP?

Program Memory:

Data Memory:

Compute Engine:

Input/Output:

I/O Connects

to Outside

World



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High Performance Digital SignalHigh Performance Digital Signal

Processing SystemProcessing System

For next generation mobile communications.

Total quantity of processing is shared by MPU and FPGA

INTRODUCTION

Mobile communication is now one of the most popular and usefulsystems for public communications.

Real time data processing of large amount of data is needed to

communications.

Integrated with real-time operation, small power consumption, and

compact configuration.

Confirmed of high quality pictures transmission.



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DIGITAL SIGNAL PROCESSINGDIGITAL SIGNAL PROCESSING

WITH EMBEDDED SYSTEMWITH EMBEDDED SYSTEM

Advanced Mobile Communication

Low data rate transmission limits quality and size of pictures and display.

An expected communication service should provide potential users with

sufficient quality with enough amounts of pixels Newly composed system of next mobile communications is assigned for

a pair of technologies

Digital signal processing with an embedded system

Efficient technology for real-time digital signal processing



SYSTEM CONFIGURATIONSYSTEM CONFIGURATION

S trategic Configuration of S oftware and Hardware

Operational components are categorized and related with each

other.

Categorization is done as the following steps;

Software offline processing

online processing

Hardware

4 kinds as MPU, DSP, FPGA and custom LSI

MPU plays a role of flexible and a limited amount of operations

DSP plays a role of constant part of processing

FPGA plays role to process high quality pictures and related

large amount of data

Custom LSI gives central part of a system at later time of

development 6



Strategy of configuration of task and hardware

MPU: micro processing unit

DSP: digital signal processor

PLD: programmable logic device

FPGA: field programmable gate array7



SYSTEM CONFIGURATION(contd.)SYSTEM CONFIGURATION(contd.)

Ex pected Function of E mbedded S ystem

Concepts of existing embedded system are;

1) No language system is prepared2) A few protocols are supported

3) Multi-process are restricted

4) The operation system is based on open OS

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PROTOTYPE SYSTEMPROTOTYPE SYSTEM

P rototype S ystem Design

by using commercial use devices relating to mobile

communication, navigation, and video games

(a) Micro processor unit (MPU)

MPU chip is produced CMOS technology with 720Mips at clockfrequency 400MHz

(b) Digital signal processor (DSP)

(c) Field Programmable Gate Array (FPGA)

(d) Customized LSI circuit

Configuration of prototype system1) To provide high quality picture and high data rate services

2) Management and control is done by a MPU

3) Graphic processing must be a custom IC

4) Content of processing is provided by the prototype radio

system FT04 9



Configuration of a prototype embedded system

VGA: video graphics array

DVI: digital visual interface

UWVGA: ultra-wide-VGA

CMOS MPU: Complementary MOS MPU10



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Photograph of a prototype system

V alidation with prototype hardware

The radio bandwidth and transmission data rate are 40 MHz at 3.5 GHz

band, 0.256 to 32 Mbit/sec maximum

Quality of pictures was found equivalent to wired transmission system

and to meet to quality of public services



CONCLUSIONCONCLUSION

The maximum data rate was 32 Mbit/s through 40 MHz radio

bandwidth at 3.5 GHz microwave band in this study

An embedded system has been taken up to provide highperformance signal processing of high quality pictures

Suitable standard and its evaluation methods for the quality of

moving and still pictures are the future issues

It was found that sufficient and enough quality of pictures can be

transmitted by a wideband CDMA radio systems with 40 MHz

bandwidth at 3.5 GHz band

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REFERENCESREFERENCES

[1] Y. Takizawa, S. Yatano, and A. Fukasawa, ³High Performance

Digital Signal Processing System for Wideband Mobile

Communications´, International journal of mathematics and

computers in simulation, Issue 2, Volume 1, 2007, pg 146-149

[2] Gerhard Fettweis, ³DSP Cores for Mobile Communications:

Where are we going?´, Mobile Communications SystemsDresden University of Technology, D-01062 Dresden

[3] Shivi Chaturvedi and Ajay Somkuwar, ́ The role of digital signal

processors (DSP) for 3G mobile communication systems´,

International Journal on Emerging Technologies, ISSN : 0975-

8364

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- Role of Digital Signal Processing in Embedded System