By Topic

Quadrature product subcarrier modulation (QPSM)

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

1 Author(s)
Dafesh, P.A. ; Aerosp. Corp., Los Angeles, CA, USA

Due to the limited availability of spectrum allocations for communications systems, it has become desirable to reuse existing spectrum by employing bandwidth efficient modulation methods to existing satellite communications systems. As the number of users of a given communication system increases, it often becomes necessary to augment the system with additional communication signals. One method that has been used to achieve this goal in Timing, Telemetry and Command (TT&C) links is conventional subcarrier phase modulation. In this work we present a new subcarrier modulation technique called Quadrature Product Subcarrier Modulation (QPSM) that enables the transmission of a quadrature multiplexed carrier modulation with single or multiple subcarrier signals in the same constant-envelope waveform. The general approach is applied to the addition of subcarrier signals to a quadrature multiplexed spread-spectrum system. The overall power efficiency is derived for each case under consideration. The modulation's spectral components are derived analytically and the analytical results are compared to results simulated using the Signal Processing WorkSystem simulation environment

Published in:

Aerospace Conference, 1999. Proceedings. 1999 IEEE  (Volume:5 )

Date of Conference: