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               HP Archive


This vintage Hewlett Packard document was preserved
                  and distributed by
               www. hparchive.com
             Please visit us on the web !




            On-line curator: Glenn Robb
     This document is for FREE distribution only!
Understanding and Measuring
        IfQ Crosstalk
    in Digital Microwave
 Communications Systems


              Chris Pedersen
               August 1988




  RF & Microwave
  Measurement
  Symposium
  and
  Exhibition

  r/iD'l   HEWLETT
  ~~ PACKARD




                www.HPARCHIVE.com
ABSTRACT:
Crosstalk between the I and Q information channels of modem communication systems arises not only from
poor baseband isolation, but also from IF and RF impairments such as amplitude ripple and nonlinear phase
response. This paper discusses techniques to measure and quantify the combined effects of crosstalk, whereas
earlier papers discussed the effects separately. It also examines the causes as well as the effects of system per-
formance degradation.


AUTHOR:
Chris Pedersen, Product Manager, Stanford Park Division" Palo Alto, CA. BSEE 1984, Brigham Young University.
Joined HP in 1984 as Product Marketing Engineer responsible for developing vector modulation applications.




                                                  www.HPARCHIVE.com
 Understanding and Measuring IIQ Crosstalk
in Digital Microwave Communication Systems
    1. What is I/O Crosstalk?
    2. What causes I/O Crosstalk?
    3. How do transfer function amplitude and
       group delay asymmetries cause I/O Crosstalk?
    4. Measuring I/O Crosstalk
        a. Through the system
        b. Through a demodulator
        c. Through a modulator
    5. Relating I/O Crosstalk to C/N degradation
    6. Summary




                 What is I/Q Crosstalk?
                                                                         Crosstalk




         ~ ~~~tor ~CHANNEL
         

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