Slide Slide 1 1 http:// http:// www.ece.vt.edu/~swe/mcms www.ece.vt.edu/~swe/mcms / / Ellingson, Ellingson, Mostafa Mostafa , & Reed , & Reed – – Sept 19, 2004 Sept 19, 2004 MIMO Development Efforts MIMO Development Efforts at Virginia Tech at Virginia Tech S. Ellingson S. Ellingson 1 1 , R. , R. Mostafa Mostafa 2 2 & J. Reed & J. Reed 2 2 { { ellingson,ramostaf,jhreed}@vt.edu ellingson,ramostaf,jhreed}@vt.edu 1 1 Virginia Tech Antenna Group (VTAG) Virginia Tech Antenna Group (VTAG) 2 2 Mobile & Portable Radio Research Group (MPRG) Mobile & Portable Radio Research Group (MPRG) Bradley Dept. of Electrical & Computer Engineering Bradley Dept. of Electrical & Computer Engineering Virginia Polytechnic Institute & State University Virginia Polytechnic Institute & State University 340 340 Whittemore Whittemore Hall, Blacksburg VA 24061 Hall, Blacksburg VA 24061 September 19, 2004 September 19, 2004
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MIMO Development Efforts at Virginia Tech · MIMO Development Efforts at Virginia Tech S. Ellingson 11, R. , R. MostafaMostafa 22 & J. Reed & J. Reed 22 {ellingson,ramostaf,jhreed}@vt.edu
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1 1 Virginia Tech Antenna Group (VTAG)Virginia Tech Antenna Group (VTAG)22 Mobile & Portable Radio Research Group (MPRG)Mobile & Portable Radio Research Group (MPRG)
Bradley Dept. of Electrical & Computer EngineeringBradley Dept. of Electrical & Computer EngineeringVirginia Polytechnic Institute & State UniversityVirginia Polytechnic Institute & State University340 340 WhittemoreWhittemore Hall, Blacksburg VA 24061Hall, Blacksburg VA 24061
Virginia Tech is interested in all aspects of MIMO:Virginia Tech is interested in all aspects of MIMO:MIMO channel physicsMIMO channel physicsMIMO communication theory MIMO communication theory Practical implementation Practical implementation (HW, SW, Systems, & Networks)(HW, SW, Systems, & Networks)
This talk:This talk:Evolution of a serialEvolution of a serial--bus based data aggregation bus based data aggregation scheme for array receivers scheme for array receivers “Full” presentation (including more details on other “Full” presentation (including more details on other efforts) available:efforts) available:
Limitations of Polled Bus ArchitectureLimitations of Polled Bus ArchitectureData AggregationData AggregationProcessing ThroughputProcessing Throughput
MIMO Field StudiesMIMO Field StudiesEasy to be overrun by complexity, yet:Easy to be overrun by complexity, yet:Traditional architectures are too slow Traditional architectures are too slow --> Time IS money> Time IS moneyNear real time monitoring is GOOD (less wasted effort when thingNear real time monitoring is GOOD (less wasted effort when things go wrong!)s go wrong!)
More info:More info:S.W. Ellingson, "Effects of Angle Spread in a Complex Outdoor EnS.W. Ellingson, "Effects of Angle Spread in a Complex Outdoor Environment At vironment At 2.4 GHz", 2.4 GHz", 2003 IEEE Antennas & Propagation Soc. Int'l Symposium2003 IEEE Antennas & Propagation Soc. Int'l Symposium, Columbus, , Columbus, OH, June 2003 (OH, June 2003 (33:264:264--7). 7). S.W. Ellingson, "Vector Channel Coherence in a Complex Outdoor ES.W. Ellingson, "Vector Channel Coherence in a Complex Outdoor Environment nvironment At 2.4 GHz", At 2.4 GHz", 2003 IEEE Antennas & Propagation Soc. Int'l Symposium2003 IEEE Antennas & Propagation Soc. Int'l Symposium, , Columbus, OH, June 2003 (Columbus, OH, June 2003 (44:208:208--11). 11).
People involved:People involved: S. Ellingson, I. Gupta (OSU), J. S. Ellingson, I. Gupta (OSU), J. HetrickHetrick (TRW), K. (TRW), K. AyotteAyotte (OSU), G. (OSU), G. WhippsWhipps (OSU)(OSU)
•• N = 36 element array, 24 N = 36 element array, 24 instrumentedinstrumented
•• 12001200--1700 MHz tuning 1700 MHz tuning
•• TTsyssys ~ 215 K per element~ 215 K per element
•• Digitizes 20 MSPS complex (14 MHz Digitizes 20 MSPS complex (14 MHz BW); processed to 78.125 BW); processed to 78.125 kSPSkSPScomplex & aggregated into a single complex & aggregated into a single 8080--Mb/s serial data streamMb/s serial data stream
•• Data stream broadcast using UDP/IP Data stream broadcast using UDP/IP over Ethernet to PC cluster for all over Ethernet to PC cluster for all subsequent processing subsequent processing
•• Pulse sensitivity ~ 24 Pulse sensitivity ~ 24 kJykJy at zenith in at zenith in 0.2 s0.2 s
•• Solves the “corner Solves the “corner turning” problem using turning” problem using serial bus architecture serial bus architecture implemented using implemented using LVDSLVDS
•• Control goes out, Control goes out, timetime--ordered data and ordered data and status comes backstatus comes back
•• Same architecture Same architecture simplifies additional simplifies additional processing & processing & interfaces to other interfaces to other systemssystems
LVDS LVDS serial bus technology is an effective replacement bus technology is an effective replacement for polled bus architectures, for polled bus architectures, especially especially for largefor large--N, lowN, low--BW systemsBW systems
More info:More info:S.W. Ellingson and G.A. Hampson, "Argus: An L-Band Array for Detection of Astronomical Transients," 2003 IEEE Int'l Ant. and Prop. Sym., Columbus, OH, June 2003 (3:256-9).S.W. Ellingson and G.A. Hampson, "Detection and Localization of L-Band Satellites Using an Antenna Array", 2004 IEEE Antennas & Propagation Soc. Int'l Symposium, Monterey, CA, June 2004.Project web site: http://www.ece.vt.edu/~swe/argus
Key involved: S. Ellingson, G. Hampson (CSIRO), many others…
FFSS/4 Conversion Stage /4 Conversion Stage 104 MSPS real @ 78 MHz 104 MSPS real @ 78 MHz →→ 52 MSPS complex @ 52 MSPS complex @ basebandbasebandProgrammable 63 tap FIR with 12Programmable 63 tap FIR with 12--bit coefficientsbit coefficients
Decimation by 2 Decimation by 2 Outputs 26 MSPS complex @ Outputs 26 MSPS complex @ basebandbaseband (16 bits)(16 bits)Can be bypassed (unless AD6620 DDC is to be used)Can be bypassed (unless AD6620 DDC is to be used)Programmable 46 tap FIR with 12Programmable 46 tap FIR with 12--bit coefficients bit coefficients
Digital Digital DowncoverterDowncoverter (DDC)(DDC)AD6620 input/output/control through FPGAAD6620 input/output/control through FPGAVery large decimations & fine tunings possibleVery large decimations & fine tunings possibleUser programmable through software interfacesUser programmable through software interfaces
MCMS: Data Acquisition and DSPMCMS: Data Acquisition and DSP
Dedicated Windows PCs in Dedicated Windows PCs in cPCIcPCI chassischassisBittwareBittware “Hammerhead” quad ADSP“Hammerhead” quad ADSP--21160 DSP board for on21160 DSP board for on--thethe--fly processingfly processingConnected to corner turner through 4 100Connected to corner turner through 4 100--MB/s “link port” MB/s “link port” cablescables
Project Status:Project Status:Mass build of subsystems & final assembly underway Mass build of subsystems & final assembly underway at industry partner’s facilityat industry partner’s facilityDelivery expected November 2004Delivery expected November 2004Long & extensive commissioning process to followLong & extensive commissioning process to follow
Planned First Uses:Planned First Uses:2.4 GHz x 40 MHz indoor channel meas. campaign2.4 GHz x 40 MHz indoor channel meas. campaign2.4 GHz 4 x 16 MIMO/OFDM simplex 2.4 GHz 4 x 16 MIMO/OFDM simplex testbedtestbed
Project Web Site:Project Web Site: http://www.ece.vt.edu/~swe/mcms/http://www.ece.vt.edu/~swe/mcms/
Key people:Key people: S. Ellingson, G. S. Ellingson, G. HampsonHampson (now at CSIRO), (now at CSIRO), B. Reynolds (B. Reynolds (AeroflexAeroflex), P. ), P. BohleyBohley ((AeroflexAeroflex), S. Fisher ), S. Fisher ((AeroflexAeroflex),…),…
Project Status:Project Status:Mass build of subsystems & final assembly underway Mass build of subsystems & final assembly underway at industry partner’s facilityat industry partner’s facilityDelivery expected October 2004Delivery expected October 2004Long & extensive commissioning process to followLong & extensive commissioning process to follow
Planned First Uses:Planned First Uses:2.4 GHz x 40 MHz indoor channel meas. campaign2.4 GHz x 40 MHz indoor channel meas. campaign2.4 GHz 4 x 16 MIMO/OFDM simplex 2.4 GHz 4 x 16 MIMO/OFDM simplex testbedtestbed
Project Web Site:Project Web Site: http://www.ece.vt.edu/~swe/mcms/http://www.ece.vt.edu/~swe/mcms/
Key people:Key people: S. Ellingson, G. S. Ellingson, G. HampsonHampson (now at CSIRO), (now at CSIRO), B. Reynolds (B. Reynolds (AeroflexAeroflex), P. ), P. BohleyBohley ((AeroflexAeroflex), S. Fisher ), S. Fisher ((AeroflexAeroflex),…),…
Current MIMO Testbed Initiatives at VT:MCMS VT-STARSDR-3000
The testbeds have strong potential for research contribution in MIMO area:
MIMO measurements and validation of performance improvementDemonstration of existing air interfaces with MIMO technology
These testbeds impart significant value and greater outreach to education:
Used by students to support wireless course projectsDifferent smart antenna algorithms have been demonstrated by studentsEmphasis on programmable, software-defined hardware