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1/22

UEC Tokyo

A Compact Tri-Polarization Antenna

for MIMO Communication Systems

Yoshio KARASAWA M. SHINOZAWA

Advanced Wireless Communication research Center (AWCC)

Univ. Electro-Communications (UEC Tokyo)

EMTS2007, Ottawa

July 27-28, 2007


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UEC Tokyo

Contents of Presentation

1. MIMO Channel and its Capacity

2. Tri-Polarization Antenna

3. Hand-Made Radio Echoic Chamber

(Creation of Multipath-rich Environment)

4. Performance Characteristics

5. Conclusions


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UEC Tokyo

MIMO Technologies

x signal Rx signal

Radiowave propagation

Tx array

Encoding withtime and space

domain

Rx array

Decoding withtime and space

domain

Multi-path propagation

Information theory

and coding theory

Adaptive array andadaptive signal

processing

MIMOcovers wide

technical areas

Applications are from W-LAN to next-generation mobile wireless systems.


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UEC Tokyo

Tx Rx

TX array

Eigen path #1

#2

#3

#4

RX array

Path profile (indoor)

MIMO Propagation Channel Model

Equivalent circuit modelbased on SVD


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UEC Tokyo

Average Channel Capacity in iid Rayleigh Fading Environment

dpNmC

unord

t )(1log

0

201

+=

+

tNm 0

21log

+= m

N

mr0

2 1log

0CNr

( ) };1;1log{ 0020 rt NNC =>>+

Channel capacity is approximately proportionalto the number of antennas when

(since = NtNr/m)


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UEC Tokyo

Increase of Channel Capacity

Use of Dual-Polarization Branches

Use of Triple-Polarization Branches

Compact MIMO Antenna


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UEC Tokyo

(H)(V)

HV

HV

Dual-Polarization antenna

Z

Z

(Z)

Triple-Polarization antenna

The tri-

polarization

antenna acts

as a three-

element MIMO

antennain the case of

multipath-rich

environment

N.K. Das et al., IEEE VTC2004 Fall, LA, Sep. 27-29, 2004.


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UEC Tokyo

33 single-pol. MIMO

33 tri-pol. MIMO

Compare


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UEC Tokyo

ntenna Element

4/

H Z V

V

H

Z

4 cm

(5 GHz)


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UEC Tokyo

Creation of a Multipath-Rich

Environment

Radio Echoic Chamber (Reverberation Chamber)

as a Reference Environment


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UEC Tokyo

Handmade Radio Echoic Chamber

(Reverberation Chamber)

4m

2m

2m

Hutch

The chamber is enclosed with 20 aluminum plates (1mx2m plate)


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UEC Tokyo

Radio-Echoic Chamber

Creation of an ideal multipath-rich environment

2m4m

2m

The chamber is enclosed

with 20 aluminum plates

(1mx2m plate)

C


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UEC Tokyo

UEC T k


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UEC Tokyo

Measurement of Propagation

Characteristics

1m

NetworkAnalyzer

5GHz Band Dipole Antennas

UEC T k


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UEC Tokyo

Measured Propagation Characteristicsin frequency and spatial domains

UEC T k


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UEC Tokyo

-60 -50 -40 -30 -2010

-3

10 -2

10 -1

10 0

Received power (dB)

Cumulativeproba

bility

0 1 2 3 4

-60

-55

-50

-45

-40

-35

-30

-25

-20

Delay (ms)

Pow

er(dB)

5000 5020 5040 5060 5080 5100

-60

-55

-50

-45

-40

-35

-30

-25

-20

Frequency (MHz)

Received

power(dB)

Tx pol . Rx pol.

V-V

= 430ns

Rayleigh

dist.

Measured Characteristics of Radio-Echoic Chamber

The characteristics arewell represented by an

outdoor multipath-rich

environment!!

UEC Tokyo


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UEC Tokyo

-50 -45 -40 -35 -30 -25 -20

0

0.2

0.4

0.6

0.8

1

Received power when Tx power is 0dB [dB]

Cumulativep

robability

Radio Echoic Chamber

(Multipath-rich environment)

ZV

Rx pol: Horizontal (H)

H H H

Z H

V H

CDF of Received Power for H-H, V-H, and Z-H

UEC Tokyo


18/22

UEC Tokyo

-20 -15 -10 -5 0 5 10

0

0.2

0.4

0.6

0.8

1

Eigen value: 1 [dB]

Cumulative

probability

1 x 1

(V-V)

2 x 2

(V, H - V, H)

3 x 3

(V, H, Z - V, H, Z)

The largest eigenvalue for multiple polarizations

(measured in a radioechoic chamber)

UEC Tokyo


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UEC Tokyo

1 10

0

0.2

0.4

0.6

0.8

1

Channel capacity [bit/s/Hz]

Cumulativeprobability

SNR=10dB

SNR=20dB

A B C D

A B C D

CDF of Channel Capacity

A: single pol. (1x1)

B: dual-pol. (2x2)

C: tri-pol. (3x3)

D: 3-antenna array

(3x3)

UEC Tokyo


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UEC Tokyo

0

5

10

15

20

SNR = 10dB

SNR = 20dB

Channelcapacity

(b/s/Hz)

Case: A B C D

Average channel capacity when using multiple polarizations

A: single-pol. (V-V: 1x1)

B: dual-pol (V,H-V,H: 2x2)

C: tri-pol (V,H,Z-V,H,Z: 3x3)

D: three single-pol. antennas

by three single-pol. antennas

(V,V,V-V,V,V: 3x3)

UEC Tokyo


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UEC Tokyo

Conclusions

-Tri-polarization antenna, which is one of very compactantennas, showed a nearly the same performance of 3x3

single-pol MIMO array in multipath-rich environment.

We will evaluate the performance of the antenna in actual

environments (both indoors and outdoors).

UEC Tokyo


22/22

UEC Tokyo

Thank you very muchfor your kind attention!

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