November 2003

N.Kita, Y.Inoue and S.Kubota, NTTSlide 1

doc.: IEEE 802.11-03/0884r1

Submission

Measured Rician K-factorin a 5GHz band

Naoki Kita, Yasuhiko Inoue, Shuji KubotaNTT

nkita@ansl.ntt.co.jpyinoue@ansl.ntt.co.jpkubota@ansl.ntt.co.jp

November 2003

N.Kita, Y.Inoue and S.Kubota, NTTSlide 2

doc.: IEEE 802.11-03/0884r1

Submission

Overview

We derived Rician K-factor by:– measuring the radio wave in some environments,

• apartment

• corridor

• office

• meeting room

– processing the output of the sliding correlator,

– comparing with the cumulative distribution of the first delay wave component with the theoretical Rician distribution.

November 2003

N.Kita, Y.Inoue and S.Kubota, NTTSlide 3

doc.: IEEE 802.11-03/0884r1

Submission

Measurement Apparatus

Sliding correlator

Center Frequency 5.2 GHz

PN Sequence length 1023

Chip rate 60 MHz

Modulation BPSK

Time Scaling Factor 6000

Time resolution 18.3 nsec

Tx / Rx Antennas

Horizontal Directivity Omni-directional

Gain 2.1 dBi

Polarization Vertical

November 2003

N.Kita, Y.Inoue and S.Kubota, NTTSlide 4

doc.: IEEE 802.11-03/0884r1

Submission

Example

-110

-100

-90

-80

-70

-60

-50

5000 1 104 1.5 104 2 104 2.5 104 3 104

-70

-65

-60

-55

-50

-45

-40

0 1 2 3 4 5 6 7 8

Example of Measured Delay Snapshots & Data Treatment

・・・・・・

Relative delay time [nsec]

Rel

ativ

e le

vel [

dB]

Relative distance between BS and MS [m]

Rel

ativ

e le

vel [

dB]

0.01

0.1

1

-20 -15 -10 -5 0 5 10

MeasuredK = 5 dBK = 10 dBK = 15 dB

Cum

ulat

ive

Pro

babi

lity

Relative level [dB]

Picked Out

K 10 dB⋍

Example of acquired delay snapshots

November 2003

N.Kita, Y.Inoue and S.Kubota, NTTSlide 5

doc.: IEEE 802.11-03/0884r1

Submission

Measurement Scenarios

Environment

Dimension (m)Tx / Rx

Antenna height

LOS NLOS

Apartment 2.8 * 8.4 * 2.5

2.8*3.6*2.5

(Another room divided

by concrete wall)

1.3 m / 1.3 m

Corridor 2.6 * 131 * 3 2.6 * 52 * 3

(Perpendicular course)

1.2 m / 2.8 m

Office 20 * 30 * 320 * 30 * 3

(Behind partition)1.0 m / 2.7 m

Meeting room 7 * 13 * 3 1.0 m / 2.7 m

November 2003

N.Kita, Y.Inoue and S.Kubota, NTTSlide 6

doc.: IEEE 802.11-03/0884r1

Submission

Apartment

• LOS: in the same room• NLOS: the neighboring room

APkitchen &dinning room

STA

room#1

room#2

room#3

STA

Ent-rance

room#4

LOS

NLOS

8.4 m

8.4 m

November 2003

N.Kita, Y.Inoue and S.Kubota, NTTSlide 7

doc.: IEEE 802.11-03/0884r1

Submission

Measured Rician K-factor in the “Apartment” scenario

Apartment

-20 -15 -10 -5 0 5 100.1

1

10

100

MeasuredK = 6dBK = 7dBK = 8dB

NLOS

R.M.S Delay Spread

22 nsec

K - factor 7 dB

Relative level [dB]C

umul

ativ

e P

roba

bili

ty (

%) NLOSLOS

-20 -15 -10 -5 0 5 100.1

1

10

100

MeasuredK = 6dBK = 7dBK = 8dB

LOS

Relative level [dB]

Cum

ulat

ive

Pro

babi

lity

(%

)

R.M.S Delay Spread 11 nsec

K - factor 7 dB

November 2003

N.Kita, Y.Inoue and S.Kubota, NTTSlide 8

doc.: IEEE 802.11-03/0884r1

Submission

Corridor

TxRx

LOSconditions

Rx

131 m

36 m

69 m

52 m34 m

NLOSconditions

November 2003

N.Kita, Y.Inoue and S.Kubota, NTTSlide 9

doc.: IEEE 802.11-03/0884r1

Submission

Measured Rician K-factor in the “Corridor” scenario (1)

Corridor　 (LOS)

Far (90m-120m)Near （ 50m-90m）

-20 -15 -10 -5 0 5 100.1

1

10

100

90 120m～9dB10dB

LOS(Far)

Relative level [dB]C

umul

ativ

e P

roba

bili

ty (

%)

Relative level [dB]

Cum

ulat

ive

Pro

babi

lity

(%

)

R.M.S Delay Spread 283 nsec

K - factor 10 dB

R.M.S Delay Spread 216 nsec

K - factor 17 dB

-20 -15 -10 -5 0 5 100.1

1

10

100

MeasuredK = 16 dBK = 17 dBK = 18 dB

LOS(Near)

November 2003

N.Kita, Y.Inoue and S.Kubota, NTTSlide 10

doc.: IEEE 802.11-03/0884r1

Submission

Measured Rician K-factor in the “Corridor” scenario (2)

Corridor　 (NLOS)

Relative level [dB]

Cum

ulat

ive

Pro

babi

lity

(%

)

R.M.S Delay Spread

158 nsec

K - factor 9 dB

-20 -15 -10 -5 0 5 100.1

1

10

100

MeasuredK = 8 dBK = 9 dBK = 10 dB

NLOS

November 2003

N.Kita, Y.Inoue and S.Kubota, NTTSlide 11

doc.: IEEE 802.11-03/0884r1

Submission

Office

R.M.S Delay Spread 70 nsec

K - factor 8 dB

Relative level [dB]C

umul

ativ

e P

roba

bili

ty (

%) NLOSLOS（ 15m-27m)

Relative level [dB]

Cum

ulat

ive

Pro

babi

lity

(%

)

R.M.S Delay Spread 49 nsec

K - factor 8 dB

Measured Rician K-factor in the “Office” scenario

-20 -15 -10 -5 0 5 100.1

1

10

100

Measured7dB8dB9dB

-20 -15 -10 -5 0 5 100.1

1

10

100

MeasuredK = 7dBK = 8dBK = 9dB

November 2003

N.Kita, Y.Inoue and S.Kubota, NTTSlide 12

doc.: IEEE 802.11-03/0884r1

Submission

Meeting RoomLOS

Relative level [dB]

Cum

ulat

ive

Pro

babi

lity

(%

)

R.M.S Delay Spread 142 nsec

K - factor 10 dB

Measured Rician K-factor in the “Meeting Room” scenario

-20 -15 -10 -5 0 5 100.1

1

10

100

MeasuredK = 9 dBK = 10 dBK = 11 dB

November 2003

N.Kita, Y.Inoue and S.Kubota, NTTSlide 13

doc.: IEEE 802.11-03/0884r1

Submission

Summary of Measured Rician K-factor

EnvironmentK (dB)

LOS / NLOS

RMS delay Spread (ns)

LOS / NLOS

Correspondence model

LOS / NLOS

Apartment 7 / 7 11 / 22 B-LOS / C-NLOS

Corridor 17 (Near), 10(Far) / 9

216(Near), 283(Far) / 158 -- / F-NLOS

Office 8 / 8 49 / 70 D-LOS / D-NLOS

Meeting room 10 / -- 142 / -- D-LOS

Conclusion• Rician K-factor values for LOS conditions: 7 – 10 [dB]• Rician K-factor values for NLOS conditions are similar to those of LOS co

nditions. More measurements will be necessary to derive a typical value.

November 2003

N.Kita, Y.Inoue and S.Kubota, NTTSlide 14

doc.: IEEE 802.11-03/0884r1

Submission

Environment

Apartment (room#2) Corridor (LOS)

Office Meeting room

November 2003

N.Kita, Y.Inoue and S.Kubota, NTTSlide 15

doc.: IEEE 802.11-03/0884r1

Submission

Thank you very much!