+ Post New Thread
Results 1 to 15 of 15
  1. #1
    Junior Member level 1
    Points: 1,551, Level: 9

    Join Date
    Nov 2005
    Posts
    17
    Helped
    2 / 2
    Points
    1,551
    Level
    9

    ber snr

    what is the relation between SNR and BER

  2. #2
    Advanced Member level 2
    Points: 5,479, Level: 17

    Join Date
    Mar 2002
    Posts
    506
    Helped
    69 / 69
    Points
    5,479
    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.

    •   Alt15th December 2005, 18:38

      advertising

        
       

  3. #3
    Junior Member level 1
    Points: 1,551, Level: 9

    Join Date
    Nov 2005
    Posts
    17
    Helped
    2 / 2
    Points
    1,551
    Level
    9

    snr vs ber

    the type of modulation is QPSK



  4. #4
    Newbie level 1
    Points: 1,278, Level: 8

    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



  5. #5
    Full Member level 2
    Points: 2,806, Level: 12

    Join Date
    Nov 2005
    Posts
    137
    Helped
    31 / 31
    Points
    2,806
    Level
    12

    ber and snr

    SNR:
    Short for signal-to-noise 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 10-5, or the expression 3 x 10-6 would indicate that three bits were in error out of 1,000,000 transmitted. BER is the digital equivalent to signal-to-noise ratio in an analog system.



  6. #6
    Junior Member level 3
    Points: 1,392, Level: 8

    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.



  7. #7
    Full Member level 1
    Points: 2,046, Level: 10

    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.



    •   Alt4th January 2006, 18:43

      advertising

        
       

  8. #8
    Full Member level 3
    Points: 2,082, Level: 10

    Join Date
    Apr 2005
    Location
    PALISTINE
    Posts
    180
    Helped
    33 / 33
    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



  9. #9
    Member level 3
    Points: 1,648, Level: 9

    Join Date
    Jan 2006
    Posts
    58
    Helped
    2 / 2
    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



  10. #10
    Full Member level 1
    Points: 2,264, Level: 11
    tamerakshar's Avatar
    Join Date
    Jan 2006
    Posts
    97
    Helped
    12 / 12
    Points
    2,264
    Level
    11

    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.



  11. #11
    Member level 2
    Points: 1,962, Level: 10

    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



  12. #12
    Full Member level 5
    Points: 3,089, Level: 13

    Join Date
    Jan 2006
    Posts
    287
    Helped
    19 / 19
    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



  13. #13
    Member level 3
    Points: 1,477, Level: 8

    Join Date
    Nov 2005
    Posts
    57
    Helped
    2 / 2
    Points
    1,477
    Level
    8

    snr versus ber

    All digiatal communication tests discusses this problem.Best one is bernard sklar



  14. #14
    Junior Member level 2
    Points: 1,385, Level: 8

    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



  15. #15
    Full Member level 5
    Points: 4,099, Level: 15
    amihomo's Avatar
    Join Date
    Jan 2007
    Location
    PERSIAN Gulf
    Posts
    282
    Helped
    61 / 61
    Points
    4,099
    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