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# Satellite Communications/Spectral Efficiency Calculations

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Question
Dear,
Sir Expert.

I want to understand how to calculate the spectral efficiency for one determinate Bandwidth allocated to a satellite carrier according to the bandwidth calculations.

BW=RS*(1+delta)

1+delta=Roll of Factor.

To be more precisally i already calculated the occupied BW.

Answer
Kamo:

Please refer to following Wikipedia article: https://en.wikipedia.org/wiki/Spectral_efficiency

Spectral efficiency, spectrum efficiency or bandwidth efficiency refers to the information rate that can be transmitted over a given bandwidth in a specific communication system. It is a measure of how efficiently a limited frequency spectrum is utilized by the physical layer protocol, and sometimes by the media access control (the channel access protocol).

The link spectral efficiency of a digital communication system is measured in bit/s/Hz, or, less frequently but unambiguously, in (bit/s)/Hz. It is the net bitrate (useful information rate excluding error-correcting codes) or maximum throughput divided by the bandwidth in hertz of a communication channel or a data link.

I cannot answer your question without knowledge of the modulation scheme.

Regards,

Thomas E. Burke, PhD

Satellite Communications

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#### Thomas E. Burke

##### Expertise

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##### Experience

Forty years of experience with satellite communications. Have held roles as system engineer on JPL Mariner 9 program and a program manager for a number of classified communication satellite programs. Served as head of TRW / Defense Communications Division / Engineering Development Operation, a 1,400-person organization responsible for all aspects of classified communication satellite design and development.

Education/Credentials
Ph.D. Chemistry, California Institute of Technology (1969) B.A. magna cum laude Chemistry, University of Minnesota (1962)

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