Diversity Combining and Piezoelectric Beam Steering for - PowerPoint Presentation

Slide1

Diversity Combining and Piezoelectric Beam Steering forMulti-Element VLC Networks

Authors: Yusuf Said Eroglu, Ismail Guvenc, Alphan Sahin, Murat Yuksel, and Nezih Pala

Presenter: Yusuf Said ErogluSlide2

Outline

BackgroundMulti-Element VLC Transmitters and ReceiversSystem ModelTransmitter And Receiver ArchitecturesCombining TechniquesSimulation ResultsPiezoelectric Beam SteeringConclusionFuture StudiesQ&ASlide3

Background

Multi-LED transmittersAngle diversityServes many usersEasy to install and maintainHigh accuracy localizationMulti-PD receiversProvides better SINR by utilizing many PDsSpace diversitySlide4

Objectives

SINR performance of the multi-LED transmittersAchievable SINRs when it is used with multi-PD receiverOptimal parameters for the multi-PD receiverEvaluate with computer simulationsSlide5

System Model – Tx and

Rx ArchitecturesTransmitters:Single-LED and 7-LEDTilt angle of LEDs: αLED directivity index i

Receivers:

Single-PD 3-PD7-PD

Field of view: βFOVTilt angle of PDs: β

a) The top view of 7-LED transmitter, and

α

angle between center and side LEDs.

3-PD receiver with

β

FOV

and

β

angles

a) The top view of 7-LED transmitter, and

α

angle between center and side LEDs.Slide6

System Model – Combining Schemes

Single-PD

For Multi-PD receivers

For

Maximum

Ratio

Combining

(MRC)

For Optimal Combining (OPC)

Four receiver combining schemes: Selective Best

(SBC)

, Equal Gain

(EGC)

, Maximum Ratio

(MRC)

and Optimal Combining (OPC).

For Selective Best Combining (SBC),

w

p

is either 1 or 0.

For Equal Gain Combining (EGC),

w

p

= 1

for

all

PDs

. Slide7

Simulation Results – SINR CDFs

For single-LED transmitter configuration

Single-PD3-PD EGC7-PD EGC

3-PD and 7-PD SBC

3-PD MRC and OPC7-PD MRC

7-PD OPCSlide8

Simulation Results – SINR CDFs

For 7-LED transmitter configuration

Single-PD and EGC3-PD SBC and MRC7-PD SBC and MRC3-PD OPC

7-PD OPCSlide9

Simulation Results – Optimal Parameters

5% and 50% SINR for single-LED transmitter vs different βFOV values

%5 SINR Single PD%50 SINR Single PD%5 SINR 7 PD%50 SINR 7 PD

%5 SINR 3 PD

%50 SINR 3 PDSlide10

5% and 50% SINR for 7-LED transmitter vs different βFOV

valuesSimulation Results – Optimal Parameters

%5 SINR Single PD%50 SINR Single PD%5 SINR 7 PD

%50 SINR 7 PD

%5 SINR 3 PD

%50 SINR 3 PDSlide11

Piezoelectric Beam Steering

LEDs will be steered to track the location of the receiver

Assuming known locationSlide12

Piezoelectric Beam Steering

SINR is especially improved at cell edge, which will provide better link during handover.Slide13

Conclusion

SINR performances of different multi-PD combining schemes are investigated for different transmitter structuresOPC is particularly found to be more efficient for multi-LED transmittersOptimal parameters for multi-PD receivers are studiedOptimal FOV and tilt angle increases when multi-LED transmitters are usedPiezoelectric beam steering is proposed to improve SINR furtherUp to 7 dB SINR gain at low SINR region with 10° tiltSlide14

Future Studies

Optimal assignment of LEDs to usersMaximum sum rate

FairnessQoS guaranteesSlide15

Q&A

Thank you for listening!