INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 1 UMR 6164 A reciprocal MIMO-UWB...
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Transcript of INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 1 UMR 6164 A reciprocal MIMO-UWB...
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
1UMR6164
A reciprocal MIMO-UWB Radio Channel Deterministic Modeling Framework
CROWNCOM - 2006Mykonos June 10
B. Uguen,L.-M. Aubert, F. Tchoffo Talom, [email protected]
CROWNCOM 2006 June 10 2006
mars 2006
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
2
OUTLINE
Interest of site-specific transmission channel simulation
Description of the proposed formalism • SISO case• MIMO case• Antenna plug in• Emphasis on channel reciprocity
Illustrations from the simulation tool • Effect of antennas on the UWB transmission channel • 2X2 MIMO situation
Conclusion
CROWNCOM 2006 June 10 2006
mars 2006
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
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UWB application context
• Short range High data rate systems (OFDM, DS-CDMA)• WPAN
• Low data rate systems with location capabilities• Sensor networks
Indoor propagation is the most common situation
CROWNCOM 2006 June 10 2006
mars 2006
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
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Evaluate channel characteristics in site-specific situation
Study the effect of antennas on the transmission channel
Evaluate location capabilities of a radio network in a given environment
Study the spatial structure of the channel
Build heterogeneous radio scenario
Evaluate time reversal focusing techniques
Interest of site-specific channel simulation
Site-specific channel simulation can be advantageously used to
CROWNCOM 2006 June 10 2006
mars 2006
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
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Ray tracing techniques for propagation channel simulation
RT techniques approach radio propagation through a finite number of rays
Upon each ray are encountered localized interactions with obstacles which separate Tx from Rx as diffraction, reflection, double refraction (wall, doors, windows,…)
The ray cluster that is obtained is conditioned by the geometry of the floor and by constitutive properties of building materials.
The E.M field is constructed using GO/UTD techniques.
CROWNCOM 2006 June 10 2006
mars 2006
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
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The matrix propagation channel
a: Txb: Rxk: rayl: interaction
Stored for each ray
CROWNCOM 2006 June 10 2006
mars 2006
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
7
The propagation channel (without antennas)
Indoor 3D Ray tracing 3D
Matrix channel in the time domain
CROWNCOM 2006 June 10 2006
mars 2006
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
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Exhaustive vectorial description of antennas
The vectorial knowledge of antenna (antenna array) radiation can be obtained
• Closed form analytical expressions (few simple antennas) • Electromagnetic simulation (HFSS, CST, …)• Near-field measurements
Unitary property
CROWNCOM 2006 June 10 2006
mars 2006
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
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Wideband measurements in a near-field chamber
Near Field chamber Satimo Stargate 32 (0.8-6GHz)
Electric field polarization ellipse in the far fieldAntenna CMA-118A (f = 3 GHz)
CROWNCOM 2006 June 10 2006
mars 2006
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
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Introducing the antenna into the channel model
Scalar ray transfer function
CROWNCOM 2006 June 10 2006
mars 2006
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
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SISO static transmission channel
Transmission channel reciprocity
Ray propagation reciprocity
CROWNCOM 2006 June 10 2006
mars 2006
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
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MIMO static transmission channel
MIMO channel
(NxM) RT 1 RT
CROWNCOM 2006 June 10 2006
mars 2006
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
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MIMO transmission channelApproximated approach
MIMO channel matrix obtained with 1 R.T
Steering vector – side a
Steering vector – side b
CROWNCOM 2006 June 10 2006
mars 2006
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
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MIMO mutual coupling
MIMO transmission channel with mutual coupling
As mutual coupling matrices are symmetric
CROWNCOM 2006 June 10 2006
mars 2006
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
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UWB antennas used for channel sounding
Conical Monocone AntennaCMA-118/A1.0-18 GHzA.R.A
Fréquence (GHz) Fréquence (GHz)
S11
(dB
)
S11
(dB
)
Cornets large bande1.0-12 GHz
Tx Rx
CROWNCOM 2006 June 10 2006
mars 2006
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
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Synthesis of an antenna LOS radio link
Frequency (GHz) Frequency (GHz)
Synthetised link from NFC measurements Measured link (FT(S21))
CROWNCOM 2006 June 10 2006
mars 2006
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
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Tx & Rx antennas : CMA-118
The antenna is
CROWNCOM 2006 June 10 2006
mars 2006
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
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... strongly modifying the transmission
channel
Tx et Rx antenna : Wideband horn antennas
CROWNCOM 2006 June 10 2006
mars 2006
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
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MIMO configuration
MIMO channel 2x2 fc = 4 GHzB(-10dB) = 2 GHzd = c / fc
CROWNCOM 2006 June 10 2006
mars 2006
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
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MIMO channelApproaches comparison
omnidirectional antennas
MIMO Matrices (Exact) MIMO Matrices (Approximated)
directional antennas
CROWNCOM 2006 June 10 2006
mars 2006
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
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AOA repartition MIMO 2x2
Omnidirectionnal antennas – azimuth
CROWNCOM 2006 June 10 2006
mars 2006
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
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Conclusion
• Deterministic E.M simulation can be used to model typical UWB indoor channel situations
• We have proposed a framework which establishes a bridge between RT and classical channel model formalisms
• It take into account antenna mutual coupling and radiation pattern of individual elements of each array• It underlines the transmission channel reciprocity
• This kind of simulation tool can help • To study of the effect of antenna • To evaluate location algorithms• To build an heterogeneous radio environment simulator • For better understanding of what amount of useful information the channel has to offer.
CROWNCOM 2006 June 10 2006
mars 2006
INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES
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Thank You