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software defined radios
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HallerHaller u. 11-13. u. 11-13.1096 Budapest, HUNGARY1096 Budapest, HUNGARY
Software Defined Radio TechnologySoftware Defined Radio TechnologySDR is an enabling technology
applicable across a wide range of areaswithin the wireless industry that providesefficient and comparatively inexpensivesolutions to several constraints posed in
current and evolving systems.
The term software defined radios (SDRs) is used to describe radios that:•provide software control of a variety of modulation techniques,•wide-band or narrow-band operation,•communications security functions, and•waveform requirements of•current and evolving standards•over a broad frequency range.
Information Transfer Thread
A
Fron End Processing InformationSecurity
Information Processing and I/O
ControlB
Channelset(s) RF Modem
LinkProcessor(TRANSEC)
InformationSecurity(INFOSEC)
Coding Networking I/O
ControlC
RF Modem Coding I/O
Antennahardware
Firmware
RFhardware
Firmware
Modemhardware
Firmware
TRANSEChardware
Firmware
INFOSEChardware
Firmware
Codinghardware
Firmware Firmware
User I/Ohardware
Commonsoftware
OS
Commonsoftware
OS
Commonsoftware
OS
Commonsoftware
OS
Commonsoftware
OS
Commonsoftware
OS
Commonsoftware
OS
Antennaspecific
modules
RFspecificmodules
Modemspecificmodules
TRSECspecific
modules
ISECspecific
modules
Codingspecificmodules
User I/Ospecificmodules
Har
dwar
epl
atfo
rmR
adio
infra
stru
ctur
eR
adio
solu
tion
Common (Standard) Application Programming Interface
Platform(hardware)Vendor #1
Platform(hardware)Vendor #2
Platform(hardware)Vendor #n
Solution(software)Vendor #1
Solution(software)Vendor #2
Solution(software)Vendor #n
Input and outputHuman interface, narrowband conversion
Service and network supportMultiplexing, setup and control, internetworking
Source coding and decodingAudio, data, video and fax interfaces
Information securityAuthentication, data integrity
Transmission securityHopping, spreading
Modem and IF processingChannel waveforms, predistortion, beamforming
RF accessAntenna, diversity, RF conversion
Channel setsSimultaneity, multiband propagation
High-level hierarchical model of wireless communication and its main allocated functions
SDR architectural and application model
One of the idea behind SDR technology is that differentapplications from different vendors could run on different
platforms trough a standard API
SDR functional interface diagram and SDR implementation levels
RF
I/O
Antenna
I/O
Modem
I/O
TRANSEC
I/O
INFOSEC
I/O MsgProc
and I/O
Routing
RF RFBB
real/comdig/ana
BitsCypherTFlowC
BitsCypherTFlowC
BitsPlainTFlowC
Control
CC C C C
II I I I
CC C C C
AUX
C
AUX AUX AUX AUX AUX
AIR
Voice
Network
Data
FlowC
C: Control/StatusI: InformationBB: BasebandFlowC: Flow Control
RemoteControl
UserControl
Common
PowerClock
Cha
nnel
set
s
Sou
rce
sets
SoftwareObject interface
0. Hardware radiono provision is made for any changes of systemattributes
1. Software controlled radiocontrol functionality implemented in software, butdo not have the ability to change attributes
2. Software defined radioprovides a broad operational range wide-band ornarrow-band operation, communications securityfunctionsand meet the waveform performance requirementsof relevant legacy systems
3. Ideal software defined radioeliminates analog amplification or heterodynemixingprior to digital-analog conversion
For more information visit: http://www.sdrforum.org/tech_comm/definitions.html
