- role of digital signal processing in embedded system
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8/3/2019 - 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
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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
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Strategy of configuration of task and hardware
MPU: micro processing unit
DSP: digital signal processor
PLD: programmable logic device
FPGA: field programmable gate array7
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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
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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
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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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