Ultra Wideband IEEE 802.15.4a Transmitter Characteristics

Mohammad Alkhodary 200806080Ali Assaihati 200350130

EE 578 Simulation Communication SystemsCase Study (101) Phase III

KFUPM

Ultra WidebandUltra Wideband Transmitter Characteristics Transmitter Characteristics 1/30

Introduction UWB FeaturesSpatial and Spectral Capacity Data transmissionUWB FCC Emission MaskModulation MethodsUWB System Model Block DiagramGeneral UWB Transmitter and ReceiverSimulation ResultReferences


Outlines Introduction

UWB FeaturesSpatial and Spectral Capacity

Data transmission

UWB FCC Emission MaskModulation MethodsUWB System Model Block DiagramSimulation ResultReferences


FrequencyModulation 2.4

GHz

Narrowband Communication

0 1 0 1

Time-domain behavior Frequency-domain behavior

ImpulseModulation

3 10 GHzfrequency

Ultra wideband Communication

time

1 0 1

(FCC Min=1500Mhz)

•Extremely short pulses, no frequency carrier



Data transmission



UWB-generic term describing radio systems having very large bandwidthAny signal

fractional bandwidth Bf , > 20% of its center frequency

fH is upper 10dB and fL is the lower 10dB cutoff frequencies of the signal spectrum

RF bandwidth > 0.5 GHz

20.02

LH

LHf ff

ffB



Data transmission


Compared to narrowband RF and spread spectrum, UWB uses extremely wide bandwidth, if the emission power is not well controlled, UWB devices might cause interference with other existing systems.


1.6 1.9 2.4

Bluetooth,802.11b WLANCordless PhonesMicrowave Ovens

PC

S

5

802.11a WLANCordless Phones

-41 dBm/Mhz“FCC Part 15 Limit”

Frequency (Ghz)

EmittedSignalPower

10.63.1Note: not to scale

UWB Spectrum

U-N

II b

an

d

ISM

ba

nd

GP

S



Data transmission


High data rate capability for communicationsMultipath immunityLow power consumptionPenetration characteristics




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Gaussian derivative provide excellent radiation propertiesAs the order of the derivative increases, the energy is moving to higher frequenciesHigher order Gaussian derivative do not need frequency shift to fit the FCC mask, but not in a power efficient manner



Data transmission





Data transmission



Pulse position modulation (PPM) where each pulse is delayed or sent in advance of a regular time scale.Bi-phase modulation create a pulse with opposite phase.Orthogonal Pulse Modulation, which requires special pulse shapes to be generated that are orthogonal to each other.



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-10 -5 0 5 100

0.5

1Gaussian

Time in nanoseconds

ampl

itude

(lin

ear)

0 1 2 3 4-400

-200

0

200Frequency of Pulse

Frequency in GHz

Spe

ctru

m (

dB)

-10 -5 0 5 10-2

-1

0

1

21st derviative of Gaussian

Time in nanoseconds

ampl

itude

(lin

ear)

0 1 2 3 4-2000

-1000

0


Frequency in GHz

Spe

ctru

m (

dB)

-10 -5 0 5 10-0.5

0

0.5

12nd derviative of Gaussian

Time in nanoseconds

ampl

itude

(lin

ear)

0 1 2 3 4-400

-200

0


Frequency in GHz

Spe

ctru

m (

dB)



Data transmission

UWB FCC `MaskModulation MethodsUWB System Model Block DiagramSimulation ResultReferences


0 50 100 150 200 250 300-1

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1Indoor LOS UWB signal

Time (nano Second)

Mag

nitu

de

Transmitted Pulse

Received Pulse



Data transmission



0 20 40 60 80 100 120 140-1

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1Indoor NLOS UWB signal

Time (nano Second)

Mag

nitu

de

Transmitted Pulse

Received Pulse



Data transmission



0 1 2 3 4 5 6

x 1010

-350

-300

-250

-200

-150

-100

-50

0

Indoor UWB spectrum after the antenna

With 1st Gaussian Derivitive

Frequency

Pow

er (

dB)

Transmitter Spectrum

FCC Mask



Data transmission



0 1 2 3 4 5 6

x 1010

-350

-300

-250

-200

-150

-100

-50

0


With 1st Gaussian Derivitive

Frequency

Pow

er (

dB)


FCC Mask



Data transmission



0 1 2 3 4 5 6

x 1010

-400

-350

-300

-250

-200

-150

-100

-50

0

Indoor UWB spectrum bafor the antenna

With 2nd Gaussian Derivitive

Frequency

Pow

er (

dB)


FCC Mask



Data transmission



0 1 2 3 4 5 6

x 1010

-400

-350

-300

-250

-200

-150

-100

-50

0


With 2nd Gaussian Derivitive

Frequency

Pow

er (

dB)


FCC Mask



Data transmission



0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

x 1010

-90

-85

-80

-75

-70

-65

-60

-55

-50

-45

-40


With 1st Derivitive

Frequency

Pow

er (

dB)


FCC Mask



Data transmission



0.5 1 1.5 2 2.5 3

x 1010

-90

-85

-80

-75

-70

-65

-60

-55

-50

-45

-40


With 1st Derivitive

Frequency

Pow

er (

dB)


FCC Mask



Data transmission



0.5 1 1.5 2 2.5 3

x 1010

-90

-85

-80

-75

-70

-65

-60

-55

-50

-45

-40


With 2nd Derivitive

Frequency

Pow

er (

dB)


FCC Mask



Data transmission



0.5 1 1.5 2 2.5 3

x 1010

-90

-85

-80

-75

-70

-65

-60

-55

-50

-45

-40


With 2nd Derivitive

Frequency

Pow

er (

dB)


FCC Mask



Data transmission



Andreas F. Molisch, Kannan Balakrishnan, Chia-Chin Chong, “IEEE 802.15.4a channel model - final report.

Alexander M. Haimovich, Jason A. Dabin, “THE EFFECTS OF ANTENNA DIRECTIVITY ON PATH LOSS AND MULTIPATH PROPAGATION IN UWB INDOOR WIRELESS CHANNELS” IEEE signal process journal

Jose L. Paredes, Gonzalo R. Arce, “Ultra-Wideband Channel Estimation” , IEEE JOURNAL OF SELECTED TOPICS IN SIGNAL PROCESSING, VOL. 1, NO. 3, OCTOBER 2007



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Ultra Wideband IEEE 802.15.4a Transmitter Characteristics