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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