Accession Number:

ADA021412

Title:

On the Close Packing of Unsynchronized FDM Waveforms

Descriptive Note:

Technical note

Corporate Author:

MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s):

• White, Brian E.

Report Date:

1975-10-14

Pagination or Media Count:

103.0

Abstract:

The effects of crosstalk on unsynchronized FDM communication links operating in the presence of additive white Gaussian noise are considered for several modulation schemes. Continuous-phase frequency shift keying is found to be far superior to various forms of phase shift keying in the sense that many more uncoordinated frequency division multiplexed waveforms can be packed into a given bandwidth for a certain imbalance in transmitter powers. This result can be applied to the uplinks andor downlinks of a demodulating communications satellite serving a multitude of mobile terminals.

Descriptors:

• *RADIO LINKS
• MOBILE
• RADIO RELAY SYSTEMS
• COMMUNICATION SATELLITES
• CROSSTALK
• FREQUENCY SHIFT KEYERS
• GAUSSIAN NOISE
• MULTIPLEXING

Subject Categories:

• Non-Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE