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INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 1 UMR 6164 A reciprocal MIMO-UWB Radio Channel Deterministic Modeling Framework CROWNCOM - 2006.

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Presentation on theme: "INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 1 UMR 6164 A reciprocal MIMO-UWB Radio Channel Deterministic Modeling Framework CROWNCOM - 2006."— Presentation transcript:

1 INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 1 UMR 6164 A reciprocal MIMO-UWB Radio Channel Deterministic Modeling Framework CROWNCOM - 2006 Mykonos June 10 B. Uguen,L.-M. Aubert, F. Tchoffo Talom, bernard.uguen@insa-rennes.fr

2 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

3 CROWNCOM 2006 June 10 2006 mars 2006 INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 3 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

4 CROWNCOM 2006 June 10 2006 mars 2006 INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 4 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

5 CROWNCOM 2006 June 10 2006 mars 2006 INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 5 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.

6 CROWNCOM 2006 June 10 2006 mars 2006 INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 6 The matrix propagation channel a: Tx b: Rx k: ray l: interaction Stored for each ray

7 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

8 CROWNCOM 2006 June 10 2006 mars 2006 INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 8 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

9 CROWNCOM 2006 June 10 2006 mars 2006 INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 9 Wideband measurements in a near-field chamber Near Field chamber Satimo Stargate 32 (0.8-6GHz) Electric field polarization ellipse in the far field Antenna CMA-118A (f = 3 GHz)

10 CROWNCOM 2006 June 10 2006 mars 2006 INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 10 Introducing the antenna into the channel model Scalar ray transfer function

11 CROWNCOM 2006 June 10 2006 mars 2006 INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 11 SISO static transmission channel Transmission channel reciprocity Ray propagation reciprocity

12 CROWNCOM 2006 June 10 2006 mars 2006 INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 12 MIMO static transmission channel MIMO channel (NxM) RT 1 RT

13 CROWNCOM 2006 June 10 2006 mars 2006 INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 13 MIMO transmission channel Approximated approach MIMO channel matrix obtained with 1 R.T Steering vector – side a Steering vector – side b

14 CROWNCOM 2006 June 10 2006 mars 2006 INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 14 MIMO mutual coupling MIMO transmission channel with mutual coupling As mutual coupling matrices are symmetric

15 CROWNCOM 2006 June 10 2006 mars 2006 INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 15 UWB antennas used for channel sounding Conical Monocone Antenna CMA-118/A 1.0-18 GHz A.R.A Fréquence (GHz) S11(dB) Cornets large bande 1.0-12 GHz Tx Rx

16 CROWNCOM 2006 June 10 2006 mars 2006 INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 16 Synthesis of an antenna LOS radio link Frequency (GHz) Synthetised link from NFC measurements Measured link (FT(S21))

17 CROWNCOM 2006 June 10 2006 mars 2006 INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 17 Tx & Rx antennas : CMA-118 The antenna is

18 CROWNCOM 2006 June 10 2006 mars 2006 INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 18... strongly modifying the transmission channel Tx et Rx antenna : Wideband horn antennas

19 CROWNCOM 2006 June 10 2006 mars 2006 INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 19 MIMO configuration MIMO channel 2x2 f c = 4 GHz B (-10dB) = 2 GHz d = c / f c

20 CROWNCOM 2006 June 10 2006 mars 2006 INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 20 MIMO channel Approaches comparison omnidirectional antennas MIMO Matrices (Exact)MIMO Matrices (Approximated) directional antennas

21 CROWNCOM 2006 June 10 2006 mars 2006 INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 21 AOA repartition MIMO 2x2 Omnidirectionnal antennas – azimuth

22 CROWNCOM 2006 June 10 2006 mars 2006 INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 22 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.

23 CROWNCOM 2006 June 10 2006 mars 2006 INSTITUT D’ÉLECTRONIQUE ET DE TÉLÉCOMMUNICATIONS DE RENNES 23 Thank You bernard.uguen@insa-rennes.fr

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