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# Bit Error Rate Calculation For Qpsk

## Contents

The Gray Code, or something like it is still useful for a device such as an analogue to digital convertor where the output number must go up and down in sequence Similarly, probability of imaginary component of greater than 0, given was transmitted is (i.e. This function generates noise with unit variance and zero mean. Generated Sun, 02 Oct 2016 04:27:52 GMT by s_hv972 (squid/3.5.20) news

The input EbNo to the function is in dB so it is converted into linear scale by 10^(EbNo/10). 2. Thanks… Reply Cancel reply Leave a Comment Name * E-mail * Website Notify me of followup comments via e-mail { 1 trackback } Download free e-book on error probability in AWGN You can use rand>0.5 for that. Reply Krishna Sankar August 2, 2010 at 5:46 am @weather: Thanks for noticing the typo in the comment.

## Bit Error Rate For Qpsk Matlab Code

Hope the post on thermal noise and awgn gives additional pointers http://www.dsplog.com/2012/03/25/thermal-noise-awgn/ Reply Ravinder February 5, 2013 at 1:35 pm Thank you very much for your reply Krishna. Pb = Ps/k http://www.dsplog.com/2008/06/05/16qam-bit-error-gray-mapping/ Reply siva January 23, 2013 at 8:36 am sir please send me book in which theoretical and simulated error rates for the digital modulation schemes like I need ur guidelines to work in communication field or in signal processing so that I can prepare for my future… Pls do reply waiting for ur precious reply.. Comment the results.

I think I am now able to understand your perspective. With out being specific, I believe having the following knowledge will help you in good stead when trying to chart out a career in wireless communication/signal processing : a) Understanding of Also, if we use lowpass filter, instead of AWGN is there a change? Ber Of Qpsk In Awgn Channel Matlab Code Will be useful for the community.Thanks.

For a pi/4 QPSK system, since the modulated signal is in complex form, the noise should also be also in complex form. Bit Error Rate Calculation Using Matlab Make sure that you do not miss a new article by subscribing to RSS feed OR subscribing to e-mail newsletter. Thanks for this nice question. Thanks Regards Tahseen Reply abhinav November 9, 2011 at 9:24 am dear sir, please send matlab code for BER for QPSK with hamming coding Reply Krishna Sankar November 11, 2011 at

but in other reference, it's not be done by it. Probability Of Error In Bpsk Since the two individual BPSK systems are orthogonal, they don't interfere with each other. you can check by command max((10^(-Eb_N0_dB(ii)/20)*n))= 1.01 where as max((10^(-Eb_N0_dB(ii)/10)*n))= 0.3251 so its clear scaling…..remember before these commands i just removed the complex part i.e n = 1/sqrt(2)*[randn(1,N)]; for my easyness. The BER results obtained using Matlab/Octave simulation scripts show good agreement with the derived theoretical results.

## Bit Error Rate Calculation Using Matlab

It is known that the typical RMS delay spread  of multipath propagation in this scenario is around 5 s. You should multiply factor of 1/sqrt(2) to the noise term which you have defined. Bit Error Rate For Qpsk Matlab Code Eb_N0_dB = [-3:10] how the range of Eb/No is chosen and what is the need of this? 3. Bpsk Bit Error Rate but i need it's paper too.

and when i want to excute for exemple modulation , i go on program principal and we excute directly the comand of modulation . navigate to this website thanks a lot… Reply Krishna Sankar December 23, 2009 at 5:47 am @adah: what is the problem which you are seeing? one can possibly send information on the two dimensions together. i have been working on viterbisim.m which is a built-in matlab example for understanding the ber tool.. Qpsk Bit Error Rate

Figure: Constellation plot for QPSK (4-QAM) constellation The scaling factor of is for normalizing the average energy of the transmitted symbols to 1, assuming that all the constellation points are equally Greg Reply Krishna Sankar January 22, 2012 at 8:50 am @Greg: Are you getting zero BER when no noise is present in the simulation? Reply waheed December 17, 2009 at 6:23 pm Hello friends: i am working on MAP , ML decoding for convolutional codes..is there any one who too work on similar More about the author So, if we consider the Tx power as a constraint (Es/No), we can see that BPSK will be better off than QPSK by 3dB (and rightly so, since the decision regions

If we need to do non-coherent demodulation, we need to do some tweakings to the transmit signal to enable the receiver to be non-coherent. Matlab Code For Ber Vs Snr For Qpsk My English is not good but i want to ask some questions. The bit SNR b = SNR s / 2.

## Actually I am doing interpolation befor fft demodulation (i.e in time domain)and m geting good MSE curve.

Hope you are not assuming that Matlab interprets them as binary digits. Links are http://www.dsplog.com/2009/01/04/viterbi/ http://www.dsplog.com/2009/01/14/soft-viterbi/ Hope this helps. Or is it LLR gives this inverse sign? Bit Error Rate Matlab Code I'm willing to work in wireless field..

The bandwidth argument might not be valid for the following reason: If we consider passband transmission, minimum required bandwidth for BPSK is only fc to fc+1/2T Hz (we can shave of And I don't precisely know what ‘size' and ‘find' functions do? (I know ip-ipHat = 0 is no error) nErr(ii) = size(find([ip- ipHat]),2); 2. I have something personal to email to you with respect to my undergraduate project work.Thanks. click site can u send it to me plzzz Reply Krishna Sankar July 21, 2010 at 6:00 am @prashant: I referred the text book Digital Communication by Proakis Reply Ayesha313 July 18,

Reply Greg January 16, 2012 at 12:30 am I am having problems simulating the BER vs SNR curve for the binary on-off keying modulation. The following is confusing. My plot looks backwards. The probability of being decoded correctly is, .

Reply Asia April 17, 2012 at 2:23 pm @Krishna: Hello Krishna I have tried the no noise case and gave me zero BER . Assuming $$E_s=1$$ for BPSK (Symbol energy normalized to 1) $$\frac{E_b}{N_0}$$ can be represented as (using above equations), $$\frac{E_b}{N_0} = \frac{E_s}{R_m R_c N_0}$$  \frac{E_b}{N_0} = \frac{E_s}{R_m R_c N_0} = The closest which I have discussed for ASK is the 4-PAM case http://www.dsplog.com/2007/10/07/symbol-error-rate-for-pam/ Hope this helps Reply STIVE CHLEF April 24, 2010 at 12:37 am Hi Krishna Pillai .. How do i calculate the snr if i need a symbol error rate of less than 10 ^-4 ??

Reply 3mor October 25, 2009 at 2:59 pm Hi Krishna, thanx a lot for your website i have a simple question: what about the unequally probable, e.g.