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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. thanks It depends on th
what is the relation between SNR and ber
Q1: 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??? Q2: 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!!!!!! tha
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
Hi there, 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!!
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.
hai there, 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?
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
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. Thanks.
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 khouly
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?
BPSK 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
Hi, 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 where 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
Salam alikom 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 (...)
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
Hello, 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: M=2; chan=rayleighchan(1/10000,100); tx=randint(50000,1,M); txSig=pskmod(tx,M); y=filter(chan,txSig); SNR=0:2:20; for n=1:length(SNR) rxSig=awgn(y,SNR(n)); rx=pskdemod(rxSig,M); [nErrors,BE
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.
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 (...)
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 Eb/No
Hi, What is maximum data rate a wireless link can support using BPSK for 10^-6 ber (Bit Error Rate), Bandwidth of channel is 200KHz and SNR is 21.335dB ? As per my understanding , Eb/No can be calculated for BPSK for a given ber using curves and value found is 11.29dB, and after that we can use relation Eb/No = S/N * W/R R comes out (...)
Look Dallas Semiconductor ber tester chips DS2172 it is very good solution for cheap and simple ber testers from DC up to 52MHz.
Look Dallas Semiconductor ber tester chips DS2172 it is very good solution for cheap and simple ber testers from DC up to 52MHz.
how to convert ber(bit error rate) to dB? what is formula? thanks
Hi. Could anyone help me to find information concerning Byte-Parallel LFSR which is used in ber Tester (1 symbol of LFSR=n bit).
Since there is no coding gain in OFDM, C/N is equal to S/N, just need convert S/N to Eb/Nt for AWGN, then find the ber v.s S/N for different QAM modulation.
I am now working at deriving the system specification. I know nothing about the SNR except the coding and bit rate :( . It is FM0 (Bi-Phase Space) encoding. Can somebody help me how to find its ber vs. Eb/N0 curve? :) Thanks~~~~
I am now working at deriving the system specification. I know nothing about the SNR except the coding and bit rate . It is FM0 (Bi-Phase Space) encoding. Can somebody help me how to find its ber vs. Eb/N0 curve? Thanks~~~~
hi, I want to plot the ber vs Eb/No. I want to make sure i have the right equation to plot.I'll be using matlab to plot the curve. Pe = 0.5*erfc(√(Eb/No)); for BPSK Is this right? Thank you.
Dear all, I read many papers regarding on the ber test of SerDes link. Different papers use different PRBS sequence 2E7-1; 2E11-1; 2E15-1; 2E23-1 to test their ber. For a same link, different PRBS will result in different ber, e.g. 10E-12 or10E-7. Does anyone can help me understand which PRBS sequence should use in a typical link, say (...)
i study about it long time sgo so i might be wrong here but as far as i understand exaxt ber cant be calculated. thats because if you want to do it you should now where are the errors and if you know that there want be any errors. mayyan
Hi, Anyone know how the R&S CMD60 measure the ber for the DECT phone? Thanks Walter
What is ber of BPSK in ber fading channel? Is there irreducible error floor, like in DPSK? Thanks in advance.
hi all: If I want to design a 2.5Gb/s CDR circuit, what is the normal ber? Is that 1e-12? Then how do I calculate the jitter spec of the VCO? Thanks a lot
i am new to this stuff....can anyone help me about this.... how actually to plot this ber graph from matlab....suppose to use pragramming in matlab or simulink? can anyone show me the code to simulate this ber... thx first.... Added after 2 hours 13 minutes: If i already simulate a QAM-16...n count t
i had plotted two ber curve for different subcarriers...... 1) the ber curve move to left when i increase the no. of subcarriers. 2) the ber curve move to right when i increase the no. of subcarriers. i just confuse....which one is the correct one? increasing in no. of subcarrier would definitely causing ICI to is that causing
Hello! Thanks for your andwer! I'd like to transmit binary data e.g {-1,1}. If the noise has 0 mean and sqrt(N0) standard deviation, and Eb=1 then is that suitable calculation you wrote me for theoretical ber? Thommer
The following paragraph was copied from Theodore Wildi's textbook: When a single synchronous generator feeds a variable load, we are interested in knowing how the terminal voltage E changes as a function of the load current I. The relationship between E and I is called the regulation curve. Regulation curves are plotted with the field exc
Attached figure compared the ber performance between (binary) unipolar signaling and bipola signaling. We see that bipolar is better than unipolar. My question is that since their only difference is shift in DC voltage level, why it is meaningful to compare them? Why it is meaningful to compare their ber at same Eb level?
Look this: DS2172 Bit Error Rate Tester (berT)
Hi all, I have build a simulation system to test my Error Correcting Code. And now I add modulation/demodulation module. When I apply BPSK and QPSK to system, I found their ber versus SNR curve almost identical, is it right in theory? My code rate is 0.9, code length >10000. BTW, I found BPSK and QPSK have identical uncoded ber versus SN
to my knowledge, ber performance of MMSE is not characteristized yet. In general, the average ber calculation involves intergration over SNR, but SNR for MMSE is not readily available.
hi,everybody pls help me about plotting ber vs receive power info,IEC-61280-2-8 or OSFTP-8 About optical communication plot ber curve vs receive power extrapolation sensitivity(ber=10E-12). etc. For example: DWDM system sensitivity extrapolation (ber=10E-12) give some material or info. Thanks!
hii.. i urgently want to know ber of OFDM compared to other techniques like CDMA and FDM etc. ? kindly give me short answers and not any link as i have to be interviewed by tomorrow, and this question is very important for me.. Regards
Hi friends, A simple problem for u guys... Can anybody help me in using the berTool in MATLAB. Say I have the transmitted and the received/demodulated bitstreams(0/1s), then how do u get the ber plots using the berTool ?
Hello, After modulating using QPSK the spectrum of modulated signal decrease as (sinc(pi*f*T))^2. In order to decrease the interference with adjacent channels we can use a BPF on the modulated signal. Does you know if this filtering changes the ber performance of the modulated QPSK ? Any formula or book ? Thankx
Hello, i have to use this trt ATF-501p8 to complete amplifier design microwave, but i don´t know how i have to achive the dc curves to obtain my working point at 1.5GHz using A.D.S. software and the pin-out for the pcb. txs.
Hi You can estimate ber if you have simulated with noise or measured eye. I have compared such estimation with measured ber. And seen that results are in agreement. Regards
Hello, Sorry, it seems little bit not understandable for me. Do you mean S11 amplitude and phase ? Shall I do that in Matlab as an example? is there any general relation between group delay and bit error rate even for the system? I think there should be some limit in group delay for specific ber, am I right ??
hellow guy: :cry: i learn the LDPC code recently, i have accomplished the encode and decode ,but i don not know the relationship of ber and SNR ,how can i define this relationship? help me qq:395044780 Email:
hi ; to design a mixer on spectre RF,i made 2 tone test by PSS with single tone & combining the other one by PAC ---> it results in a very broken curve & 3rd order curve became upper then 1st order curve is there a better way to show the famous IIP3 curves rather PSS PAC ..??? thanks in advance