1 / 3

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 ]

lesley-love
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 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. <author>, <company>

  2. Simplistic Example of Cross-Correlation Problem in OQPSK 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>

  3. Now time align the I and Q channels as an 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>

More Related