relation between SNR and BER

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mnosrati

Junior Member level 1
ber snr

what is the relation between SNR and BER

Points: 2

Element_115

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

kaleza

kaleza

Points: 2

mnosrati

Junior Member level 1
snr vs ber

the type of modulation is QPSK

rouholla

Newbie level 1
bit error rate snr

sinu_gowde

Full Member level 2
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.

wwfeda

Junior Member level 3
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.

changfa

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.

Nimer

Full Member level 3
relation between ber and snr

hi
i would add also that the snr is afactor in the ber besides otheres like processing errors

regards

kaustubhkhole

Member level 3
ber snr relation

Is there any relation between
SNR - Signal to Noise Ratio
CNR - Channel to Noise Ratio
BER - Bit Error Rate

tamerakshar

Full Member level 1
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.

cygnet

Member level 2
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

Naveed Alam

Full Member level 5
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

sameerbabu

Member level 3
snr versus ber

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

amihomo

Full Member level 5
ber versus snr

refer to this link : "Channel Capacity in AWGN"

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