| MUOS KA DOWNLINK PERFORMANCE EVALUATION WITH TRANSMITTER DISTORTION
Liang Chu
Lockheed Martin Corporation
Sunnyvale, CA
and
Daisy Cheng
Lockheed Martin Corporation
Sunnyvale, CA
ABSTRACT
Mobile User Objective System (MUOS) employs a Ka-band feeder downlink from the satellite to the Radio Access Facility (RAF). The feeder downlink uses Octal Phase Shift Keying (8-PSK) modulation. 8-PSK is sensitive to High Power Amplifier (HPA) non-linear distortion. In this paper, we analyze the sensitivity of MUOS feeder downlink Bit Error Rate (BER) degradation to HPA Output Back-Off (OBO). The analysis model consists of the non-linearity, Additive White Gaussian Noise (AWGN), and ideal carrier recovery and synchronization. Monte Carlo Bit Error Rate (BER) simulations are performed with the analysis model. to derive the distorted Energy-per-Bit to Noise Density Ratio (Eb/No)at the average BER. Finally, we derive required coding gain and characterize Eb/No degradation sensitivity to HPA OBO.
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| Liang C. Chu received his Ph.D. degree in electrical and computer engineering from the Georgia Institute of Technology. He is now a senior staff engineer with the Advanced Technology Center, Lockheed Martin Coropration in Sunnyvale, CA. Previously, he was with IBM Research in NY and Titan Corporation in Los Angeles. He was also an adjacent assistant professor in the Department of Electrical and Computer Engineering of Manhattan College in NY. His research interest is in the area of wireless/satellite communications, modulation and error correction coding applications, and broadband technologies/high-speed networking.
Daisy Cheng received the B.S. degree in electrical engineering at the University of Illinois at Urbana-Champaign. She received the M.S. degree in electrical engineering from the University of Southern California. She is a staff engineer with Lockheed Martin Space Systems Company in Sunnyvale, CA. Previously, she was with Boeing Satellite Systems in El Segundo, CA and Space Systems Loral in Palo Alto, CA. |