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davyzhu
Joined: 23 May 2004
Posts: 521
Helped: 3
Location: oriental
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 01 Apr 2006 2:44 C/N and Eb/No relation? |
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| tags: c/n eb/no |
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Hi all,
I notice that most paper use Eb/No to describe performance. But product datasheet use C/N.
Why use these two metric? And what's the relationship with them?
Any suggestions will be appreciated!
Best regards,
Davy
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mshareef
Joined: 18 Feb 2006
Posts: 203
Helped: 45
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| 01 Apr 2006 8:32 Re: C/N and Eb/No relation? |
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| tags: relation between ber n eb/no eb/no and its relation c/n eb/no relation between eb/no and carrier |
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Hi,
I have found the following. Hopefully it should prove useful:
C/N
It is the Carrier to Noise Ratio. This is almost what you measure with the spectrumsanalyzer (The S.A. measures (C+N)/N but C+N is very close to C as N is very low compared to C).
Eb/No is commonly used for digital carriers. Eb is the energy per information bit and No (N-Zero) is the noise in 1 Hz bandwidth.
The relation between them are:
C/N = (Eb/No)*DR/BWn , Where:
DR= Datarate (inc. overhead, ex. coding bits)
BWn = Noise bandwidth (= Occupied bandwidth * IF filterfactor (typical 1,2) )
The C/N ratio is measured in a manner similar to the way the signal-to-noise ratio (S/N) is measured, and both specifications give an indication of the quality of a communications channel. However, the S/N ratio specification is more meaningful in practical situations. The C/N ratio is commonly used in satellite communications systems to point or align the receiving dish; the best dish alignment is indicated by the maximum C/N ratio.
Eb/No
A common SNR-like figure of merit for digital communication systems, particularly those obeying Nyquist criteria. Also understood as SNR-per-bit, relates to BER for a given modulation type.
Eb is independent of bit rate - it's the energy per bit sent, regardless of the rate.
the following article should give a satisfactory explanation:
http://www.sss-mag.com/ebn0.html
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ekh_81
Joined: 25 Oct 2005
Posts: 15
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| 31 May 2006 21:35 C/N and Eb/No relation? |
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| could any one post a clear figure of BER vs Eb/No
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egemini
Joined: 02 Apr 2002
Posts: 158
Helped: 2
Location: GOC
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| 05 Jun 2006 14:19 Re: C/N and Eb/No relation? |
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| Hello what is this IF filter factor, mebtioned earlier?
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moustafahussein
Joined: 05 May 2006
Posts: 15
Helped: 1
Location: Alexandria, Egypt
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| 09 Jun 2006 10:37 Re: C/N and Eb/No relation? |
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| ekh_81 wrote: |
| could any one post a clear figure of BER vs Eb/No |
For which system do you mean? I beleive that the figure for BER vs Eb/No would differ from one system to another.
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nidhalodeh
Joined: 20 Jun 2006
Posts: 54
Helped: 4
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| 30 Jun 2006 7:45 Re: C/N and Eb/No relation? |
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Hello, dont be confuzed by Eb/N0 and C/N,
Eb, related to energy per bit, and C related to carrier power, so you can consider any one for your simulation, also it is better to consider the ratio in dB,
see the attached figure, maybe you need it, signal-to-noise ratio, SNR is also similar to Eb/N0 and C/N, .
Best Regard
Nidhal
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