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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [ OQPSK Cross-Talk Characteristics ] Date Submitted: [ 12 March 2001 ] Source: [ Rick Roberts ] Company [ XtremeSpectrum ] Address [ 8133 Leesburg Pike, Vienna, Va. 22182 ]

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Project ieee p802 15 working group for wireless personal area networks wpans

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

Submission Title: [OQPSK Cross-Talk Characteristics]

Date Submitted: [12 March 2001]

Source: [Rick Roberts] Company [XtremeSpectrum]

Address [8133 Leesburg Pike, Vienna, Va. 22182]

Voice:[703.749.0230], FAX: [703.749.0249], E-Mail:[rick@xtremespectrum.com]

Re: [ revision zero]

Abstract: [Discussions the cross talk nature of OQPSK]

Purpose: [Support TG PHY Committee]

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.

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Project ieee p802 15 working group for wireless personal area networks wpans

Simplistic Example of Cross-Correlation Problem in OQPSK Area Networks (WPANs)

Consider OQPSK transmission in a simple complex impulse response channel

I3

I5

I2

QI2

QI3

I

QI1

QI4

QI5

I1

I4

Notice the Cross Talk Between the I and Q Channels and the Locate of the Zero Crossing

Q1

Q4

Q5

IQ2

IQ3

IQ5

Q

IQ1

IQ4

Q2

Q3

Now cross correlate between the two channels “at the respective sample time for each arm”

Xqi = E[Q1*QI1 + Q2*QI2 + Q3*QI3 + Q4*QI4 + Q5*QI5]

Xiq = E[I1*IQ1 + I2*IQ2 + I3*IQ3 + I4*IQ4 + I5*IQ5]

<author>, <company>


Project ieee p802 15 working group for wireless personal area networks wpans

Now time align the I and Q channels as an Area Networks (WPANs)OQPSKreceiver would do using a time delay

I3

I5

I2

QI2

QI3

I

QI1

QI4

QI5

I1

I4

Notice the Cross Talk Between the I and Q Channels and the Locate of the Zero Crossing

Q1

Q4

Q5

IQ2

IQ3

IQ5

Q

IQ1

IQ4

Q2

Q3

Notice that the cross correlation value has changed! Statistically this is not the same signal! It is this change in statistics that I believe is causing problems for Jayhen. - Rick

Now cross correlate between the two channels “at the sample time”

Xqi = E[Q1*I1 + Q2*I2 + Q3*I3 + Q4*I4 + Q5*I5]

Xiq = E[I1*Q1 + I2*Q2 + I3*Q3 + I4*Q4 + I5*Q5]

<author>, <company>