+ Post New Thread
Results 1 to 15 of 15

15th December 2005, 15:43 #1
 Join Date
 Nov 2005
 Posts
 17
 Helped
 2 / 2
 Points
 1,551
 Level
 9
ber snr
what is the relation between SNR and BER

15th December 2005, 19:38 #2
 Join Date
 Mar 2002
 Posts
 509
 Helped
 71 / 71
 Points
 5,684
 Level
 17
snr ber
The higher(Better) the SNR the Better the BER.
You need know the type of modulation to be used, Bandwidth,
the noise of the system etc...
Look up "Link Budget", Sensitivity (Equation), Eb/No Curves, and BER Curves.
SNR is one variable of several that determine what the likelihood of receiving
Correct data is.
i.e. 1Bit out of 1x10^7 Bits will be incorrect.
Good luck
1 members found this post helpful.

17th December 2005, 08:14 #3
 Join Date
 Nov 2005
 Posts
 17
 Helped
 2 / 2
 Points
 1,551
 Level
 9
snr vs ber
the type of modulation is QPSK

17th December 2005, 08:14

19th December 2005, 15:32 #4
 Join Date
 Nov 2005
 Posts
 0
 Helped
 0 / 0
 Points
 1,278
 Level
 8
bit error rate snr
for more information abaut this read the digital communication proakis chapter 4 &5

20th December 2005, 05:18 #5
 Join Date
 Nov 2005
 Posts
 137
 Helped
 33 / 33
 Points
 2,806
 Level
 12
ber and snr
SNR:
Short for signaltonoise ratio, the ratio of the amplitude of a desired analog or digital data signal to the amplitude of noise in a transmission channel at a specific point in time. SNR is typically expressed logarithmically in decibels (dB).
SNR measures the quality of a transmission channel or an audio signal over a network channel. The greater the ratio, the easier it is to identify and subsequently isolate and eliminate the source of noise. A SNR of zero indicates that the desired signal is virtually indistinguishable from the unwanted noise.
BER:
Short for bit error rate. In a digital transmission, BER is the percentage of bits with errors divided by the total number of bits that have been transmitted, received or processed over a given time period. The rate is typically expressed as 10 to the negative power. For example, four erroneous bits out of 100,000 bits transmitted would be expressed as 4 x 105, or the expression 3 x 106 would indicate that three bits were in error out of 1,000,000 transmitted. BER is the digital equivalent to signaltonoise ratio in an analog system.

20th December 2005, 06:32 #6
 Join Date
 Dec 2005
 Posts
 29
 Helped
 4 / 4
 Points
 1,392
 Level
 8
relationship between snr and ber
They are also use as a standard in communication protocols. For example, if you have bluetooth, you need to have a minimum amount of SNR and achieve the BER in your equipment for it to be certified.
They are related but not necessarily the same. SNR is the physical limitation that you have between the signal power and the noise power. Different topologies will have different BER in the same situation. For example, normally you get higher performance (lower BER) using lower transfer rate like BPSK compare to 64QAM in the same SNR environment.

20th December 2005, 06:32

4th January 2006, 19:43 #7
 Join Date
 Dec 2005
 Posts
 119
 Helped
 90 / 90
 Points
 2,046
 Level
 10
qpsk ber snr
It depends on specific modulation and on channel condition. Generally, we will have BER proportional to alpha*SNR^{beta} where alpha is the multiplier and beta is the power of SNR. Usually beta is donated as diversity gain and is the slope of BER~SNR curve on loglog scale. alpha depends on how crowed the constellation is. The more crowed, the biger alpha.

4th January 2006, 19:43

26th January 2006, 14:06 #8
 Join Date
 Apr 2005
 Location
 PALISTINE
 Posts
 180
 Helped
 34 / 34
 Points
 2,082
 Level
 10
relation between ber and snr
hi
i would add also that the snr is afactor in the ber besides otheres like processing errors
regards

4th February 2006, 06:06 #9
 Join Date
 Jan 2006
 Posts
 58
 Helped
 3 / 3
 Points
 1,648
 Level
 9
ber snr relation
Is there any relation between
SNR  Signal to Noise Ratio
CNR  Channel to Noise Ratio
BER  Bit Error Rate

5th February 2006, 04:02 #10
relation between snr and ber
if u meant the relation, it is :
(BER) is proportional to (1/SNR)^K
where:
k is a specific subcarrier index.

8th February 2006, 10:24 #11
 Join Date
 Oct 2003
 Posts
 49
 Helped
 4 / 4
 Points
 1,962
 Level
 10
snr to ber
Hi, friends.
Here is a pdf document which written by the Intersil specialist. It can answer your question about the relationship of BER and SNR.
Good Luck!
Chiyg

9th February 2006, 14:18 #12
 Join Date
 Jan 2006
 Posts
 287
 Helped
 20 / 20
 Points
 3,089
 Level
 13
snr and ber
accroding to the page no. 84, of OFDM FOR WIRELESS MULTIMEDIA COMMUNICATIONS, BY RICHARD AND RAMJEE,
Es/No=k* Eb/No
where k=no. of bits per symbol
so for QPSK, k=2 and
Es/No=2* Eb/No
REGARDS

9th February 2006, 14:18

13th February 2006, 09:33 #13
 Join Date
 Nov 2005
 Posts
 57
 Helped
 2 / 2
 Points
 2,111
 Level
 10
snr versus ber
All digiatal communication tests discusses this problem.Best one is bernard sklar

13th February 2006, 10:06 #14
 Join Date
 Aug 2005
 Posts
 24
 Helped
 1 / 1
 Points
 1,385
 Level
 8
ber to snr
this link will useful to your question
http://www.cs.ucl.ac.uk/staff/S.Bhat...tes/node6.html

14th January 2007, 11:49 #15
 Join Date
 Jan 2007
 Location
 PERSIAN Gulf
 Posts
 284
 Helped
 69 / 69
 Points
 4,169
 Level
 15
 Blog Entries
 3
ber versus snr
refer to this link : "Channel Capacity in AWGN"
http://www.edaboard.com/ftopic145306.html
+ Post New Thread
Please login