September, 2005 doc.: IEEE 802.15-05-0554-00-004a Project ... · September, 2005 Slide 3 Kyung-Kuk...

September, 2005

Kyung-Kuk Lee, OrthotronSlide 1

doc.: IEEE 802.15-05-0554-00-004a

Submission

Project: IEEE P802.15 Working Group for Wireless Personal Area NProject: IEEE P802.15 Working Group for Wireless Personal Area Networks (etworks (WPANsWPANs))

Submission Title: [CSS Modulation and Detection]Date Submitted: [ 20 September, 2005]Source: [Kyung-Kuk Lee, et al], Company [Orthotron Co., Ltd.]Address [709 Kranz Techono, 5442-1 Sangdaewon-dong, Jungwon-gu, Sungnam-si, Kyungki-do, Korea 462-120]Voice:[82-31-777-8198], FAX: [82-31-777-8199], E-Mail: [ [email protected]]

Abstract: [Intermediate status of 2.4GHz Chirp-Radio activity]Purpose: [This document is for discussion on the Modulation and Detection of 2.4GHz Chirp-Radio]Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15.

September, 2005


doc.: IEEE 802.15-05-0554-00-004a

Submission

CSS ModulationCSS Modulation&&

DetectionDetectionby

Kyung-Kuk Lee / Jong-Wha Chong,Sang-Hun Yoon, Jin-Doo Jung, Sang-Dong Kim,

Heon-Uk Lee, Young-Sam Kim, Dae-Gun OhOrthotron Co., Ltd. / Hanyang Univ., Korea

[email protected]

September, 2005


doc.: IEEE 802.15-05-0554-00-004a

Submission

Modulation & CodingModulated

SignalBinary Datafrom PPDU Binary

SymbolMapper

Bi-Ortho.SymbolMapper

QPSKMapper

DifferentialEncoder

QCSKModulator

Bit to Binary Symbol mapper:Group every 3-bits (or 6-bits) into a Symbol for 1Mbps (or 250Kbps)

Binary Symbol to Bi-Orthogonal Symbol mapper:Each 3-bits (or 6-bits) symbol is mapped to one of 4-chip (or 32-chip)Bi-Orthogonal Symbol Sequence for 1Mbps (or 250Kbps)

QPSK Mapper:Group every alternative 4-chips into I and Q for Group of 4 QPSK

Differential Encoder: QPSK D-QPSKSymbol-by-Symbol Differential Encoding between Group of 4 QPSK

QCSK Modulator:Phase Modulation of 4 sub-chirps with Group of 4 D-QPSK Symbols

September, 2005


doc.: IEEE 802.15-05-0554-00-004a

Submission

H8 =

H64 =

BiBi--Orthogonal Mapping TableOrthogonal Mapping TableModulation & Coding

0 1 2 3 4 5 6 7 63Decimal:

September, 2005


doc.: IEEE 802.15-05-0554-00-004a

Submission

SubSub--chirp Formulachirp FormulaQCSK Signal Generation

( )

( ) ( ) ( )

( )

0

3

, , , , , , , , ,0

4 4 3 4 3 4

0

, ,

,

QCSK:

( ) ,

e

, ,

xp2

1, , 4 ( )

0.5

)

, (

m mchirp

n

n k k m k m n

j j j jn k

k m n k m RC n k mn k

n k m sub c

c e e e or e QCS

s t s t n

c j t T t T p t T

m piconet

T k T nT

where

Kπ π π π

µω ξ

∞

=

∞

= =

− −

=

⎡ ⎤⎛ ⎞= + − − × −⎜ ⎟⎢ ⎥⎝ ⎠⎣ ⎦= ⋅

= +

=

⋅⋅

+

∑

∑∑

( )( )

( )

( )

6 6

6

7 7 71 2 3 4

, ,

1 1

1.2 10 sec, 6.0 10 sec

, 2 7 10 1 , 0.25

4.5 10 sec, 3 10 sec, 1.5 10 sec, 0sec2

nhirp m

sub chirp

BW sub BW

k m k m

RC

T T

T

f

p t

τ

µ ω ω π α α

τ τ τ τω π

− −

− − −

⎧⎪⎪⎪

− − −⎪⎪⎪ = × = ×⎨⎪

= = × × × + =⎪⎪ = × = × = × =⎪⎪ = ×⎪⎩

=

( )( )

( ) ( )( )

( )( )

1 1

1 2

1 1 11 1 cos - 2 1 2 1 2 2

0

sub

sub sub sub

sub

Tt

T T Tt tT

αα

α π α αα α α

−≤

+

⎡ ⎤⎛ ⎞⎛ ⎞+ − −⎢ ⎥+ < ≤⎜ ⎟⎜ ⎟⎜ ⎟⎜ ⎟+ +⎢ ⎥⎝ ⎠⎝ ⎠⎣ ⎦

2subTt

⎧⎪⎪⎪⎪⎨⎪⎪⎪ >⎪⎩

km 1 2 3 4

1 +1 +1 -1 -1

2 +1 -1 +1 -1

3 -1 -1 +1 +1

4 -1 +1 -1 +1

km

,Table 1. k mξ

,Table 2. [MHz]k mf

1 2 3 4

1 fC-3.15 fC+3.15 fC+3.15 fC-3.15

2 fC+3.15 fC-3.15 fC-3.15 fC+3.15

3 fC-3.15 fC+3.15 fC+3.15 fC-3.15

4 fC+3.15 fC-3.15 fC-3.15 fC+3.15

km

September, 2005


doc.: IEEE 802.15-05-0554-00-004a

Submission

QCSK Signal Waveform

I

II

III

IV

0 2 4 6 8 10 12-1

-0.5

0

0.5

1

0 2 4 6 8 10 12-1

-0.5

0

0.5

1

0 2 4 6 8 10 12-1

-0.5

0

0.5

1

0 2 4 6 8 10 12-1

-0.5

0

0.5

1

Multiple Multiple piconetpiconet

Real Imaginary Envelope

September, 2005


doc.: IEEE 802.15-05-0554-00-004a

Submission

Power Factor of QCSK SymbolSymbol Duration

Effective Signal DurationPFSignal Power Factor:

Equivalent Signal power duration = 0.9us

Raised-Cosine Time Window: α = 0.25

1.2usec

6

6

6 10 1.6667 2.2 [ ]0.9 10 4

PF dB−

−

×∴ = = =

× ×0.9 usec

6 usec

Smean = 1

1.6667

2Nσ2

Nσt

September, 2005


doc.: IEEE 802.15-05-0554-00-004a

Submission

Chirp Spreading Gain

Spreading Gain @ 1Mbps:

Spreading Gain @ 250Kbps:

0

b mean b meanE S R SSGN N BW N

= = ⋅

114 [ ] 14 11.5 [ ]1 [Mbps]Mbps

b

BW MHzSG dBR

= = = =

25014 [ ] 56 17.5 [ ]

0.25 [Mbps]Kbpsb

BW MHzSG dBR

= = = =

* Equivalent Noise Bandwidth of CSS: BWnoise = 14MHz

September, 2005


doc.: IEEE 802.15-05-0554-00-004a

Submission

Processing Gain

( )0

effective effectiveb mean S SE SSG SG PF PGN N N N

= ⋅ = ⋅ ⋅ = ⋅

1 Mbps:

250 Kbps:

1 11.5 2.2 13.7 [ ]MbpsPG dB= + =

250 17.5 2.2 19.7 [ ]KbpsPG dB= + =

September, 2005


doc.: IEEE 802.15-05-0554-00-004a

Submission

-15 -10 -5 0 5 1010-6

10-5

10-4

10-3

10-2

10-1

100Bi-Orthogonal Modulation

Eb/N0 (SINR) [dB]

Bit

Erro

r Rat

e

Uncoded (Eb/N0)8-Biortho (Eb/N0)64-Biortho (Eb/N0)1Mbps Simulation (Eb/No)250Kbps Simulation (Eb/No)8-Biortho CSK (SINR)64-Biortho CSK (SINR)

Reference: Bernard Sklar, “Digital Communications: Fundamentals and Applications”, 2nd Edition ( ) ( )( 2)* 3* / 0 6* / 0 / 2bP M Q Eb N Q Eb N⎡ ⎤= − +⎣ ⎦

13.7 dB19.7 dB

BER – over - Eb/No (SINR)

250 Kbps1 Mbps

1 Mbps

250 Kbps

1.3dB

3.5dB

September, 2005


doc.: IEEE 802.15-05-0554-00-004a

Submission

Detection of D-QPSK

Multiple-bit Differential Detector of MDPSK (N=3)

DD

Conventional Differential Detector of MDPSK

Reference: M. K. Simon, S. M. Hinedi, andW. C. Lindsey, “Digital Communication Techniques”, Englewood Cliffs, NJ: Prentice-Hall, 1995.

September, 2005


doc.: IEEE 802.15-05-0554-00-004a

Submission

Detection of D-QPSKMaximum lkelihood sequence estimation rather thansymbol-by-symbol detection

Performance of this scheme fills the gap between differentially-CD and ideal CD

The amount of improvement gained over conventional C-DDdepends on M (ary) and N (Symbol intervals)

Substantial performance improvement can be obtainedfor some additional symbol intervals of observation.

September, 2005


doc.: IEEE 802.15-05-0554-00-004a

Submission

Conventional DD

CD

Detection of D-QPSK

N=2

N=5

N=3

N=∞

BER-over-Eb/No for Multiple-Differential Detection of D-QPSK

September, 2005


doc.: IEEE 802.15-05-0554-00-004a

Submission

Comparison of IEEE 802 Radios

-15 -10 -5 0 5 10 1510

-6

10-5

10-4

10-3

10-2

10-1

100

IEEE 802 Radio BER-vs-SINR

SINR [dB]

Bit

Erro

r Rat

e

802.11b(1Mbps)802.11b(2Mbps)802.11b(5.5Mbps)802.11b(11Mbps)802.15.1(1Mbps)802.15.3(22Mbps)802.15.4(250Kbps)802.15.4a(1Mbps)802.15.4a(250Kbps)

IEEE 802 RADIO BER-vs-SINR

SINR [dB]

Bit

Err R

ate

CSS250Kbps

CSS1Mbps

ZigBee(250Kbps)

Bluetooth(1Mbps)

W-LAN

September, 2005


doc.: IEEE 802.15-05-0554-00-004a

Submission

Concluding RemarksModulation:- 8ary Bi-Orthogonal D-QCSK for 1Mbps- 64ary Bi-Orthogonal D-QCSK for 250Kbps

Bi-Orthogonal Coding Gain:- Coding Gain = 1.3dB @ 1Mbps- Coding Gain = 3.5dB @ 250Kbps

Significant Processing Gain: Chirp-SG + PF- PG = 13.7dB @ 1Mbps- PG = 19.7dG @ 250Kbps

Recommended Maximum-Likelyhood Differential Detection- Substantial performance improvement over conventional DD- Easy to implement nearly Ideal CD performance

Coexistence & Robustness- Low Interference Level to the other Radios- Robustness for interference and multi-path

September, 2005 doc.: IEEE 802.15-05-0554-00-004a Project ... · September, 2005 Slide 3 Kyung-Kuk...

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