Applications of the Software Radio as a Seamless Interface ... · GENI DSP Process Spectrum A DSP Process is able to establish a ‘connection’ to a particular spectrum segment

8/7/98 15:04Copyright 1998 Donald H. Steinbrecher

All rights reserved. Slide 1

Applications of the SoftwareRadio as a Seamless Interface

Between the Atmosphere and theFibersphere

1998 INTERNATIONAL SYMPOSIUM ONADVANCED RADIO TECHNOLOGIES

Boulder, Colorado

9-11 September 1998



Applications of the Software Radio as aSeamless Interface Between the Atmosphere

and the Fibersphere

Dr. Donald H. SteinbrecherSubmarine Electromagnetic Systems Department

Bldg.1319, Room 356, Code 34111176 Howell Street

Newport, RI [email protected]

Tel:401.832.5656 Fax:401.832.7345 DSN: 920.5656



RF TranslatorRF Translator

Intermediate-Frequency

Analog Processor

Intermediate-Frequency

Analog Processor

AntennaElement

AntennaElement

Analog-to-Digital

Converter

Analog-to-Digital

ConverterDigital Object

FormatterDigital Object

Formatter

Atmosphere

Network Fibersphere



A/D

Converter

Digital

Filter

Digital

Filter

Digital

Filter

Digital

FilterCommutator

CH 01

CH 02

CH 03

CH nn

A digital partitioner separates the Nyquist band intonn equal sub bands.

Dis

cret

e or

der-

nn F

ouri

er T

rans

form

01

02

03

nn



ATM PacketFormatter

ATM PacketFormatter

CH ik

Network Fibersphere

Address ControlAddress Control



SNAP Network-Centric Smart Antenna Structure

GenericGenericInterfaceInterface

DeviceDevice

High-Speed Network

AntennaElement


DeviceDevice


DeviceDevice


DeviceDevice

AntennaElement

ProcessProcess ProcessProcess ProcessProcess ProcessProcess

GENI

DSPProcess

Spectrum

A DSP Process is able toestablish a ‘connection’ to

a particular spectrumsegment through a GENIand an antenna element

High-BandwidthDigital Network

Antenna Element



Network

Element Array

Digital Beam FormerProcess



The Generic Infrastructure

ABSTRACT:

“The SpectrumWare project is applying asoftware oriented approach to wirelesscommunication and distributed signalprocessing.............”

....David L. Tennenhouse



The Generic InfrastructureBuilding a DSP Thread

DSPOBJ

DSPOBJ




DSPOBJ

DSPOBJ

DSPOBJ

CORB

Application programming InterfaceApplication programming Interface




DataTable

DSPOBJ

DataTable

DSPOBJ

DataTable

DSPOBJ

CORBA


SignalFlowPath




DataTable

DSPOBJ

DataTable

DSPOBJ

DataTable

DSPOBJ

CORBA


SignalFlowPath



ATMInterfaceObject


DataTable

DSPOBJ

CORBA


SignalFlowPath

ATMInterfaceObject



ATMInterfaceObject


DataTable

DSPOBJ

CORBA


SignalFlowPath

ATMInterfaceObject

FMDemodulator




FMDemodulator

CORBA


FM Demodulator

ATM ATM




FMDEMOD




FMDEMOD

FMDemodulator

CORBA


FM Demodulator

ATM ATM




DataTable

DSPOBJ

DataTable

DSPOBJ

DataTable

DSPOBJ

CORBA


SignalFlowPath



VirtualRadios

Vanu Bose

Software Devices & Systems Group

MIT Laboratory for ComputerScience



GuPPII/O

AMPS Application



I/O System Design

Hardware: General Purpose PCI I/O card (GuPPI)– Stream samples directly to/from memory

– Bus master capability takes advantage of high PCIthroughput

• Raw performance– Transmit: 850 Mbits/sec

– Receive: 930 Mbits/sec

• Design: Mike Ismert

DECPCI-PCIBridge

XilinxPCI

ControllerTX Page FIFO

RX Page FIFO

TX Data FIFO

RX Data FIFO

Xilinx Config EEPROM

PCIBus

ApplianceAdapterInterface



I/O System Performance

• GuPPI device driver– Use virtual memory remapping to eliminate expensive data copies– Use memory to absorb process scheduling variance

• Current performance– Sustained transfer of 512 Mbits/sec (32 MSPS @ 16 bits) between application

and RF front end

– Low processing overhead: < 0.1 cycles/sample





Air Interface....The Future

AirDomain

Digital-to-RF

DigitalDomain

RF-to-Digital



A Layer Model for Digital Radio

RF

Baseband

RF

Baseband

Baseband

Digital

Baseband

Digital

Digital Transport Layer: The Network

Transport Adaptation Layer

Digital Signal Processing

Air Layer




RF

Baseband

RF

Baseband

Baseband

Digital

Baseband

Digital




Air Layer




RF

Baseband

RF

Baseband

Baseband

Digital

Baseband

Digital




Air Layer




RF

Baseband

RF

Baseband

Baseband

Digital

Baseband

Digital




Air Layer



30.72 MSamples/Sec

The Partitioner/TransmultiplexerFunctions

Partitioner

Transmultiplexer

Broadband Narrowband



The Partitioner/TransmultiplexerFunctions



Asynchronous Transfer Mode

53 bytes

48 bytes

Payload

5-byte header

Standard ATM Packet Design



Asynchronous Transfer Mode

53 bytes

48 bytes

Payload

5-byte header

Standard ATM Packet Design



ATM Packetized RF Samples

• Sample Rate for 30-kHz Channel = 60 kSamples/Sec.(12-bit samples )

• 90 kbytes/Sec = 2000 ATM Packets/Sec• OC-3c data payload transport rate = 135 Mbps• OC-3c can support about 188 30-kHz channels

kkkk

512 samples



Adaptation for Digital Transport

RF

Baseband

Baseband

Digital

BU

FF

ER

DataPartitioner

Air Layer




RF

Baseband

Baseband

Digital

BU

FF

ER

BU

FF

ER

Data AddressFromNOS

Partitioner

Air Layer




RF

Baseband

Baseband

Digital

BU

FF

ER

BU

FF

ER

+

BU

FF

ER

Data Address

ATM Packets

FromNOS

Partitioner

Air Layer




RF

Baseband

Baseband

Digital

BU

FF

ER

BU

FF

ER

+

BU

FF

ER

Data Address

ATM PacketsFromNOS

BU

FF

ER

BU

FF

ER

+

BU

FF

ER

BU

FF

ER

BU

FF

ER

+

BU

FF

ER

BU

FF

ER

BU

FF

ER

+

BU

FF

ER

BU

FF

ER

BU

FF

ER

+

BU

FF

ER

Partitioner

Air Layer



Addressing Spectrum Channels

kkkk

512 samples

T

Des

ign

ated

RF

Ban

d

Des

ign

ated

RF

Ban

d

P512 Channels

CommunicationsBand



Addressing Spectrum ChannelsAddressing Spectrum Channels

kkkk

512 samples

T

Des

ign

ated

RF

Ban

d

Des

ign

ated

RF

Ban

d

P




kkkk

512 samples

T

Des

ign

ated

RF

Ban

d

Des

ign

ated

RF

Ban

d

PChannel ‘k’




kkkk

512 samples

T

Des

ign

ated

RF

Ban

d

Des

ign

ated

RF

Ban

d

PChannel ‘k’




kkkk

512 samples

T

Des

ign

ated

RF

Ban

d

Des

ign

ated

RF

Ban

d

PChannel ‘k’

512 Channels

Documents

Applications of the Software Radio as a Seamless Interface ... · GENI DSP Process Spectrum A DSP Process is able to establish a ‘connection’ to a particular spectrum segment