A New TR-UWB Receiver Exploiting Frequency Components

Seonkeol Woo, Hoongee Yang, Sunghyum Yang, Youngsoo Kim, Jonggwan Yook and Bongsoon Kang

IEICE TRANS. COMMUN., VOL.E91-B, NO.5 MAY 2008

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Presented By: S M Riazul Islam

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Objective

Presenting a new TR-UWB receiver

1. Separating frequency-component of UWB pulses into real and imaginary parts

2. Independently correlating and

3. Effectively combining

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Introduction to TR-UWB

)()( Dtgdtg RiD

dttgDtgz DR )()(

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Proposed System

Assume a function for D-delayed reference pulse, )()( Dtgtg RS

Using Parseval’s theorem, dffGfGdttgtgz DSDS )()()()( **

Replacing the expression for data pulse, dftGdz Si 2)(

To implement frequency domain integral, )1,...,0( Nnff n , T

fff nn

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Under AWGN, a frequency component of a D-delayed reference pulse at f=fn can be expressed as,

The frequency component of a data pulse at f=fn,

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Proposed SystemA discrete form of z is,

Thus a receiver to implement (7) uses the decision rule,

Accordingly (9) can be written as,

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Proposed System

The resultant SNR at the correlator output,

And BER performance is given by,

(8), and (10)

X+Y as sufficient statistics

Slope, )(tan 1

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Proposed SystemLet us rotate the coordinate clockwise by, Tow message points are relocated at )0,(),0,( 11

The decision rule becomes,

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Frequency Domain Based TR-UWB Rx

Block, Real part-sum and, correspond to XBlock, imaginary-part sum, correspond to Y

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Simulation Parameter and Result

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Conclusion

• A frequency-domain based TR-UWB receiver is proposed and its performance is analyzed

• It shows Performance improvements over the previous system using simple complex correlation

• Improvement is gradually noticeable as gets farther away from 45 deg

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My Opinion Why this paper?• A variation of TR-UWB Major Contribution• Separation UWB pulse into real and imaginary

parts Shortcomings!• It needs extra signal processing task and phase

calibration• SNR is doubled. But BER Curve! Addenda• Introducing Weighting factor may improve the

performance• It may be justified for WBAN

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Thank You