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An OFDM System Using Polyphase Filter and DFT Architecture for Very High Data Rate ApplicationsThis paper presents a conceptual architectural design of a four-channel Orthogonal Frequency Division Multiplexing (OFDM) system with an aggregate information throughput of 622 megabits per second (Mbps). Primary emphasis is placed on the generation and detection of the composite waveform using polyphase filter and Discrete Fourier Transform (DFT) approaches to digitally stack and bandlimit the individual carriers. The four-channel approach enables the implementation of a system that can be both power and bandwidth efficient, yet enough parallelism exists to meet higher data rate goals. It also enables a DC power efficient transmitter that is suitable for on-board satellite systems, and a moderately complex receiver that is suitable for low-cost ground terminals. The major advantage of the system as compared to a single channel system is lower complexity and DC power consumption. This is because the highest sample rate is half that of the single channel system and synchronization can occur at most, depending on the synchronization technique, a quarter of the rate of a single channel system. The major disadvantage is the increased peak-to-average power ratio over the single channel system. Simulation results in a form of bit-error-rate (BER) curves are presented in this paper.
Document ID
20010068891
Acquisition Source
Glenn Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Kifle, Muli (NASA Glenn Research Center Cleveland, OH United States)
Andro, Monty (NASA Glenn Research Center Cleveland, OH United States)
Vanderaar, Mark J. (Efficient Channel Coding, Inc. Brooklyn Heights, OH United States)
Date Acquired
September 7, 2013
Publication Date
May 1, 2001
Subject Category
Communications And Radar
Report/Patent Number
NASA/TM-2001-210813
NAS 1.15: 210813
E-12728
Meeting Information
Meeting: 19th International Communications Satellite Systems Conference and Exhibit
Location: Toulouse
Country: France
Start Date: April 17, 2001
End Date: April 20, 2001
Sponsors: Centre National d'Etudes Spatiales, American Inst. of Aeronautics and Astronautics, European Space Agency, SUPAERO
Funding Number(s)
PROJECT: RTOP 755-08-0B
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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