Symbol Rate

Symbol Rate is the number of symbol changes per second made to the signal. According to the modulation coding method (ModCod) used each symbol represents 1, 2, 3, 4, etc. bits of transmission rate data.

SR – Symbol Rate
FEC – Forward Error Correction
DR – Data Rate
m – Modulation Factor
sps – Symbols per second

Bits per Symbol

  • BPSK = 1
  • QPSK = 2
  • 8PSK = 3
  • 8QAM = 3
  • 16QAM = 4
  • 32QAM = 5
  • 64QAM = 6

Symbol Rate Formula

 

Symbol Rate = DR / (m x FEC)

 

iNetVu Antenna Symbol Rate Calculation (ksps)

Example of Symbol Rate Calculation

Data Rate is 2048 kbps

FEC ¾

Modulation type 8QAM

Symbol Rate = Data Rate / (m x FEC)

SR = 2048 / (3 x 0.75 ) = 910.2 ksps


Many modern satellite modems will calculate the symbol rate for you in the configuration pages.

 

sym_rate
Comtech CDM-625 Symbol Rate Config

Comments

    bonnet

    (January 8, 2017 - 06:21)

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