Circular polarization in PCS systems using polling

Robert A. Dell-Imagine

doi:10.1117/12.228141

8 December 1995 Circular polarization in PCS systems using polling

Robert A. Dell-Imagine

Proceedings Volume 2601, Wireless Data Transmission; (1995) https://doi.org/10.1117/12.228141
Event: Photonics East '95, 1995, Philadelphia, PA, United States

Abstract

The cell site in certain PCS systems polls the user terminals to determine their needs for system access. Reflections of the high power interrogation signal can mask the presence of the user terminal's response transmission. Circular polarization, which has been used in radar systems to reduce reflections from rain, is considered as a means of reducing the interference caused by reflections of the polling signal. The paper considers the mechanism of this reduction and establishes the requirements for amplitude and phase balance of the two components of linear polarization as a function of the required level of cancellation at the polling antenna. The mechanisms of depolarization of the reflected signal in both natural and man-made environments are considered. Man-made environments can have very large reflections, but generally these reflections have a low level of cross-polarization. Propagation in urban environments is considered to determine how rapidly the environmental reflections decrease as a function of the time delay between the arrival of the polling signal at the user and the transmission of the user's reply.

Citation Download Citation

Robert A. Dell-Imagine "Circular polarization in PCS systems using polling", Proc. SPIE 2601, Wireless Data Transmission, (8 December 1995); https://doi.org/10.1117/12.228141

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available