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admoon
Joined: 01 Jul 2008
Posts: 34
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 04 Sep 2008 17:58 just think? |
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hi all
i want to find the diferrence between
1. S/N
2. spectral effeciency
3. Capacity
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Bhanumurthy
Joined: 18 Jun 2008
Posts: 201
Helped: 95
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| 05 Sep 2008 14:57 Re: just think? |
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Hi,
Each parameter is defined separately,but all are related in one form or another.It's like this: S/N is defined as The ratio of Average Signal Power to Noise Power.Generally S/N is measured at the output of the receiver and as per ITU regulations, the S/N that should be acheived at the output of the telephone channel is 50dB.
Now,Spectral Efficiency is also called Bandwidth Efficiency and is defined as Bit rate/Bandwidth.Generally,M-ary PSK signals are more spectrally efficient compared to M-ary FSK signals.
And,finally Capacity refers to Channel Capacity and is defined by Shannon as
C = Blog(1+S/N) where B is the Bandwidth.As the name implies, the Capacity of the Channel describes,how many bits the channel can transmit per sec.with minimum Probability of error.
Hope u got my answer.
Regards
Bhanumurthy.
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admoon
Joined: 01 Jul 2008
Posts: 34
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| 06 Sep 2008 8:35 Re: just think? |
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thanks for replay
but what the difference between capacity or spectral effeiency and " througput" ?
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beta_group
Joined: 21 Mar 2007
Posts: 58
Location: libya
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| 09 Sep 2008 1:13 just think? |
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Hi,
The Capacity for wireless system is the number of user that can be support under certen (GoS or QoS).
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xulfee
Joined: 27 May 2008
Posts: 230
Helped: 25
Location: Pakistan
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| 09 Sep 2008 4:42 just think? |
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| these r very basic terms u can see them in any book,i sugest bp lathi
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admoon
Joined: 01 Jul 2008
Posts: 34
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| 09 Sep 2008 11:02 Re: just think? |
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| so what is " throuput " ?
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