All Topics  
Process gain

 

 
   Email Print
   Bookmark   Link
 

 

Process gain
 
 
  Topics Process gain Topic Home

In a spread spectrum
Spread spectrum

Spread-spectrum techniques are methods by which electromagnetic radiation generated in a particular Bandwidth is deliberately spread in the frequency domain, resulting in a signal with a wider bandwidth....
 system, the process gain (or 'processing gain') is the ratio of the spread (or RF) bandwidth to the unspread (or baseband) bandwidth. It is usually expressed in decibels (dB).

For example, if a 1 kHz signal is spread to 100 kHz, the process gain expressed as a numerical ratio would be 100,000/1,000 = 100. Or in decibels, 10log10(100) = 20 dB.

Note that process gain does not reduce the effects of wideband thermal noise.






Discussion
Ask a question about 'Process gain'
Start a new discussion about 'Process gain'
Answer questions from other users
Full Discussion Forum



Encyclopedia


In a spread spectrum
Spread spectrum

Spread-spectrum techniques are methods by which electromagnetic radiation generated in a particular Bandwidth is deliberately spread in the frequency domain, resulting in a signal with a wider bandwidth....
 system, the process gain (or 'processing gain') is the ratio of the spread (or RF) bandwidth to the unspread (or baseband) bandwidth. It is usually expressed in decibels (dB).

For example, if a 1 kHz signal is spread to 100 kHz, the process gain expressed as a numerical ratio would be 100,000/1,000 = 100. Or in decibels, 10log10(100) = 20 dB.

Note that process gain does not reduce the effects of wideband thermal noise. It can be shown that a direct sequence spread spectrum (DSSS) system has exactly the same bit error behavior as a non-spread spectrum system with the same modulation format. Thus, on an additive white Gaussian noise
Additive white Gaussian noise

ExplanationIn Telecommunication, the additive white Gaussian noise channel model is one in which the information is given a single impairment: a linear addition of wideband or white noise with a constant spectral density and a Gaussian distribution of noise samples....
 (AWGN) channel without interference, a spread system requires the same transmitter power as an unspread system, all other things being equal.

Unlike a conventional communication system, however, a DSSS system does have a certain resistance against narrowband interference, as the interference is not subject to the process gain of the DSSS signal and hence the signal-to-interference ratio is improved.