UPC – project MESAUPC – project MESA

Array Antennas for Packet Transmission

Networks

Antonio Pascual Iserte, Nada Ahmed Awad, Ana I. Pérez-Neira

DEPT. OF SIGNAL THEORY AND COMMUNICATIONSDEPT. OF SIGNAL THEORY AND COMMUNICATIONS POLYTECHNIC UNIVERSITY OF CATALONIA (UPC)POLYTECHNIC UNIVERSITY OF CATALONIA (UPC) Communications Signal Processing Group, Barcelona, SPAINCommunications Signal Processing Group, Barcelona, SPAIN

TELECOMMUNICATIONS TECHNOLOGICAL CENTER OF CATALONIA TELECOMMUNICATIONS TECHNOLOGICAL CENTER OF CATALONIA (CTTC), (CTTC), Barcelona, SPAINBarcelona, SPAIN {nahmed,tonip,anuska}@gps.tsc.upc.es{nahmed,tonip,anuska}@gps.tsc.upc.es

Workshop on Broadband Wireless Ad-Hoc Networks and Services, 12th-13th September 2002, ETSI,Sophia Antipolis,France

UPC – project MESAUPC – project MESA

Ad-hoc networks operate in the unlicensed 2.4GHz ISM Ad-hoc networks operate in the unlicensed 2.4GHz ISM band.band.

Different types of Interference sources. Different types of Interference sources.

Use of spatial diversity schemes to combat interference Use of spatial diversity schemes to combat interference in a time variant interference scenarioin a time variant interference scenario..

receiver architecture enhanced with the Generalized receiver architecture enhanced with the Generalized Sidelobe Canceller (GSLC).Sidelobe Canceller (GSLC).

SimulationsSimulations

UPC – project MESAUPC – project MESA

Generalized SideLobe CancellerGeneralized SideLobe Canceller

qw

B awQ-1

Differential

demodulatorGFSK

( )s n

min (NLMS)

Q

IF filter (1 MHz)A/D converter1 MHz samp

I/Q

kf

( )tx

( )b nx

( )qs n

1

0( ) ( ) ( ) ( )

NI

d d i iin s n s n n

x h h n

2ˆ ˆq d d

w h h

Signal Model:

Array design-“quiescent”:

-blocking matrix:

-adaptive beamvector: (NLMS)

)()(1 1

0

* ndnxN

dN

n

h

*

1 2 *, 1,1

ˆ ˆ1 ; 1 1T Hi

d Q di i i ii

hh h h i Q

h

h B B B h 0

)()(N

1 , )()(

N

1 ,

1)(

1

0

1

0

11

1

N

nd

N

n

H

xdx

HH

dxd

Ha

nnnnn dxhxxRhRBBBhRh

w

UPC – project MESAUPC – project MESA

SNIR behavior for (non-)adaptive algorithms (GSLC).

UPC – project MESAUPC – project MESA

BER evaluation for (non-)adaptive algorithms (GSLC).

PARAMETERS-Angular spread: 15º-IEEE 802.11b interference: mean SIR = -10 dB