29 Threads found on edaboard.com: Ber Curves
what is the relation between SNR and ber
Digital communication :: 15.12.2005 09:43 :: mnosrati :: Replies: 14 :: Views: 47125
Can anyone shows the SNR v.s ber curve of MB OFDM under(bit rate: 55.5M,80M,160M,200M,320M,480M...)in AWGN and multipath channel???
can some one tell me ,when works under the 200M,as standrad given the parameter (spreading rate=2),where should times the parameter????
is it after the IFFT block?????
does anyone help plz!!!!!!
Digital communication :: 01.09.2008 10:49 :: dennismsa :: Replies: 2 :: Views: 1161
Hi, Can some one tell me what kinds of information we can get from ber curves?
I know it puts bit error rate against signal power, but I see so many research papers where for e.g. cdma is compared against ofdma by just showing graphs but don't really tell the significance of comparison.
It depends on th
Digital communication :: 21.12.2009 11:30 :: saeddawoud :: Replies: 4 :: Views: 3071
Dear sir ,
I am trying to create a matlab model of HARQ ( all types) using LDPC (llr based) as fec .
I wrote a code using matlab library (fec.ldpcenc-fec.ldpcdec) , but the ber curve is somehow different than the other literature works .
Could you explain me what is wrong with my approach ,did i miss something (maybe sigm
Digital communication :: 19.11.2010 13:28 :: matido :: Replies: 0 :: Views: 2723
I am studying how bad is demodulation in case of not having a real match filter as the first block in the reception of the signal. do you know where could I find curves which take into account this error in the filter?? The only curve I found is the teoretical one and I guess, its behaviour is not the same
Thanks in advance!!
Digital communication :: 23.01.2011 09:09 :: Xavipersonal :: Replies: 0 :: Views: 1128
anyone can help me with that ?
It seems that there is some problem in simulation as you are getting 0 ber just after 1e-5. Just plot them on one graph using plot but it wont be a water fall curve.
Digital communication :: 26.03.2012 19:05 :: capcas :: Replies: 30 :: Views: 1691
im verifiying my QPSK architecture and quit confuse on whether to choose SNR or Eb/No in the AWGN block. is there any difference between SNR and Eb/No to obtain ber? what is the difference if there are?
Digital Signal Processing :: 16.05.2012 03:18 :: asraf :: Replies: 7 :: Views: 3467
For particular QC-LDPC code and BCH code, you have observed the SNR gap between the two codes from the simulation results. There is no need to know the theoretical SNR gap between them. So, I guess that you are talking about the theoretical performance of an ensemble of QC-LDPC codes. In this case, you can obtain the average weight enumerator for a
Digital communication :: 30.10.2013 11:03 :: lovewa :: Replies: 1 :: Views: 396
Can anyone plz tell me or fwd me some literature on viterbi equilizer.
I would appriciate if they also give some SNR vs ber curves.
Digital communication :: 23.01.2008 15:02 :: bee :: Replies: 1 :: Views: 970
u need to get the ber curves and know the minimum SNR at the demodulator , and from the SNR , u can calculate the noise figure , of the system , by knowing the noise floor which depends on the channel BW
RF, Microwave, Antennas and Optics :: 15.03.2008 12:45 :: khouly :: Replies: 4 :: Views: 653
Hi, could you be more specific what you want to do? Plot some ber-cuves for polarization diversity with different channel models? Or maybe something antenna related, simulate diversity gain etc?
RF, Microwave, Antennas and Optics :: 22.04.2008 06:52 :: Jone :: Replies: 8 :: Views: 743
I am trying to mimic the results in this paper,
thus I expect the curves of MMSE and ZF equalizaiton to be worse than AWGN, while better than no equalization at all. However the tests I ran didnt make sense.
here is the graph and scripts..
THanks in advance.
Digital communication :: 08.01.2009 09:19 :: kel8157 :: Replies: 4 :: Views: 960
with Power Amplifiers
or perfect timing, you will add a frequency offset to the received signal and determine
performance in the presence of AWGN for SNR values of 20, 10, 5, 0 dB. The idea is to sweep
the frequency range from 0 to fMAX which is the frequency at which ber is at or near 50%.
Perform this task in small frequency increments
Digital communication :: 11.11.2009 18:43 :: ufaqshah :: Replies: 0 :: Views: 622
I am trying to plot the ber of BPSK, but it does not work correctly, I do not know why. I am using the following code:
Digital communication :: 13.01.2010 04:04 :: saeddawoud :: Replies: 0 :: Views: 610
hi, i've graph in my simulation (ds cdma on urban channel ,ber versus Eb/N0) which is smooth and broken, i want to achieve theorical results by using a matlab functions to fit the graphe like the functions : smooth, berFIT. but the graph stay far from the theorical, please help me.
Digital communication :: 10.04.2010 08:21 :: ige1986 :: Replies: 2 :: Views: 765
Hi , I implement an OFDM System with Simulink , by regular search i found that sent one , but when i run it to get ber Vs EbNo , it get high curves and values rather than expected to be.
i use QPSK as modulation technique , so as i know the ber curve of OFDM must be the same as QPSK system ,
is that true , and if, what is the wrong in (...)
Digital Signal Processing :: 25.08.2010 19:56 :: ReComm :: Replies: 3 :: Views: 748
I am very new in wireless systems
I have tried to simulate QAM on Rayleigh fading channel
This is a mathematical model of Rayleigh fading channel
y = hx + n
y = complex receive vector
h = channel gain according to Rayleigh fading
x = complex transmit vector
n = complex AWGN noise
I'm so confused about h
Could anyone plea
Digital communication :: 10.06.2011 05:51 :: puripong :: Replies: 1 :: Views: 686
H r u all?? I hope u r all fine. Well, I want to know which is better 2x2 or 3x3 or 4x4 MIMO receiver whether we used ML or sphere decoder detector??
I mean, is the performance improves with number of antennas increase or decrease (nxn MIMO systems)
please help me with performance ber curves and reason behind ur answers (...)
Digital communication :: 06.02.2012 04:13 :: ahmeddeia :: Replies: 8 :: Views: 1153
Hi, I am simulating the fading effect of multipath in wireless communications. I am using a contributed model in opnet the model ID- 418, Any one used this before can you please answer my questions
1.I am getting a very high spike for an instance for the nearest node why it is so?
2. how can see the SNR and ber curves, which i cannot see now when
Network :: 27.03.2012 12:49 :: dileepkarichery :: Replies: 0 :: Views: 360
I use the following formula to generate noise in AWGN BPSK and QPSK , but it failed in QAM16,QAM256
Any suggestion , why it failed?
Es = Rc * log2M*Eb
σ2 = No/2
Rc : Coding rate =1
M : constellation points
Es: energy per symbol
Eb: energy per bit
σ : Standard deviation
No : noise spectral;
Eb/No (BPSK) = 1/2σ2
Digital communication :: 13.01.2013 17:10 :: ReComm :: Replies: 3 :: Views: 463
EYECALC is an easy to use behavioral eye diagram simulator from EECALC. Free 30 day trial download.
* Dual Dirac capability, Pre-emphasis, Custom eye masks
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* Impulse response, Mag, Group Delay
* Export to Excel, Save to Clipboard, Save to Image
Software Links :: 14.01.2007 14:01 :: mg777 :: Replies: 0 :: Views: 440
Any help will be useful
Digital communication :: 24.02.2007 05:54 :: VanHelsing21 :: Replies: 3 :: Views: 1551
does anyone have the simulation results for WCDMA downlink .... any results or curves are welcomed (like ber ,spectrum ...etc )
Digital communication :: 03.07.2007 05:32 :: makanaky :: Replies: 2 :: Views: 815
i want to do statistical eye diagram simulations and bathtub curves win Agilent ADS.
their web help say i have to use the STATEYE sink component.
i just can not find it in any of the palettes.
license used: pb_si_designer_pro
where and how to find it?
it seems that if i open a "design guide" named signal_integrity > preemphasis_and_
PCB Routing Schematic Layout software and Simulation :: 26.11.2009 18:23 :: buenos :: Replies: 1 :: Views: 2041
the probability of error is dependent on the quantity Eb/No usually the dependence is erfc(Eb/No), as the argument of erfc() increases , the prob. of error decreases, thus we need either high Eb or low No.
Eb/No is the SNR because Eb is the energy per bit for the clean signal and No is the noise PSD amplitude. The importance of Eb/No is thus of
Digital communication :: 07.08.2010 09:16 :: Ahmed Alaa :: Replies: 3 :: Views: 1396
I am trying to see the performance of Viterbi decoder on different bit length data for certain range of Eb/No value(0 to 10 dB). I generate 1000 bits length data, encode it, pass it over AWGN, decode it and simulate the ber. I divide the same original 1000 bits length data into 2 (five hundred five hundred each) and did the same procedure.
Digital communication :: 20.09.2010 05:24 :: maranatha :: Replies: 0 :: Views: 359
Normally codes do have negative code gain at high ber (below some Eb/No).
Look at the figure (I've picked up it from the web; i don't guarantee its accuracy, but it is qualitatively coorect).
At ber=1e-5, code gain is about 0.5 dB.
Code gain is 0 dB at ber=0.003, and at ber higher than that, code gain is negative. (...)
Digital communication :: 04.02.2011 20:00 :: zorro :: Replies: 13 :: Views: 1857
I want to simulate spread spectrum techniques and other coding techniques like cdma and get their ber to SNR curves in presence of jammers or other interfering signals.I want to test jammers of different specifications and test that if my transmitter and reciever are location "x" distance apart then how would be the transmission..
Can any body r
Digital communication :: 01.03.2011 04:19 :: mosabja :: Replies: 0 :: Views: 431
I want to interface system level results (C/I) to link level results (Frame Erasure Rates), so I need some mapping tables and statistical link level results/ curves for GSM link level performance (ber vs. C/I and FER vs. ber). Does anybody have link level mapping tables ?
Digital communication :: 08.01.2012 11:06 :: Ahmed Alaa :: Replies: 0 :: Views: 769