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Reply Krishna Sankar March 21, 2012 at 5:02 am @Prakash: I have not tried OFDM MSK. If this is not the case, the calculated BER is too low. The system returned: (22) Invalid argument The remote host or network may be down. Reply karim December 8, 2012 at 3:39 am could u send me the matlab code .plz Reply Krishna Sankar December 8, 2012 at 3:49 am @karim: the link is provided have a peek at these guys

The new method, which is similar to Moose’s method, estimates the CFO by measuring the carrier phase difference between 2 identical successive training sequences embedded in the preambles. please reply Reply Krishna Sankar December 12, 2012 at 5:43 am @kiran: capacity in bits/per seconds/per Hz is a good metric for comparing the modulation schemes. ip = rand(1,N)>0.5 how it generate only +1 and -1 what is the concept of using the term>0.5 2. For the case of BPSK for example, the laser transmits the field unchanged for binary '1', and with reverse polarity for '0'.

Hope you have made the simulations and obtained satisfactory results. Thanks a lot, i will be very grate ful to get help from you guys. The transmitted carrier can undergo numbers of phase changes.

For the example scenario, out of the available bandwidth from -10MHz to +10MHz, only subcarriers from -8.1250MHz (-26/64*20MHz) to +8.1250MHz (+26/64*20MHz) are used. Archived August 28, 2007, at the Wayback Machine. ^ IEEE Std 802.11b-1999 (R2003) — the IEEE 802.11b specification. ^ IEEE Std 802.11g-2003 — the IEEE 802.11g specification. ^ Understanding the Requirements I corrected it. Probability Of Error In Qpsk If you can mail more about "what is not working", i can try to help.

The following line of code: xt = (nFFT/sqrt(nDSC))*ifft(fftshift(xF.')).'; I understand the multiplication of nFFT to cancel the inherent 1/nFFT in the ifft() function. Bit Error Rate Of Qpsk Am I right! Reply Amjad January 10, 2010 at 7:06 am Dear Krishna, Can you little bit tell me how to simulate the Uncoded BER and ergodic capacity for webb channel using QPPM modulation. Thus, each received symbol is demodulated to one of the M {\displaystyle M} points in the constellation and a comparator then computes the difference in phase between this received signal and

This results in a two-dimensional signal space with unit basis functions ϕ 1 ( t ) = 2 T s cos ( 2 π f c t ) {\displaystyle \phi Bpsk Bit Error Rate Matlab Code All the subcarriers in this preamble is known at the receiver, and this is used to estimate the channel. The difference encodes the data as described above. Reply vasanth May 3, 2011 at 3:29 pm hi every1….i wud lik 2 know whether 16 QAM is better or qpsk in terms of BER??….if its QPSK, den y BPSK

Print BER for BPSK in OFDM with Rayleigh multipath channel by Krishna Sankar on August 26, 2008 Mr. Reply ebtesam June 14, 2012 at 8:07 pm hi , iam new here i need disscision about ber performance of bpsk over awgn and rayliegh channel Reply Krishna Sankar June Bit Error Rate Of Bpsk Please provide your comments on this observation. Bit Error Rate Matlab Code Reply Krishna Sankar November 2, 2012 at 6:43 am @Manoj: This post (and the matlab code) on BER of BPSK in AWGN is addressing most of your queries.

Print BPSK BER with OFDM modulation by Krishna Sankar on June 10, 2008 Oflate, I am getting frequent requests for bit error rate simulations using OFDM (Orthogonal Frequency Division Multiplexing) modulation. More about the author Changes in phase **of a single** broadcast waveform can be considered the significant items. However, in my design, there are two integrators. Reply Krishna Sankar December 25, 2012 at 5:46 am @Vishnavi: Sorry, I do not know the topic. Ber Of Bpsk In Awgn Channel Matlab Code

I dont think here I would need to normalize the exp(j*2*pi*rand(size(ht1))); term with 1/sqrt(2)*1/sqrt(nTap) because amplitude of exp(j*2*pi*rand(size(ht1))) is already 1 - I am only interested in its phase which can NNAMDI Reply Krishna Sankar November 12, 2009 at 5:33 am @Egerue: You are right. The differential encoder produces: e k = e k − 1 ⊕ b k {\displaystyle \,e_{k}=e_{k-1}\oplus {}b_{k}} where ⊕ {\displaystyle \oplus {}} indicates binary or modulo-2 addition. http://gatoisland.com/bit-error/bit-error-probability-bpsk.php Although the graph seems to be correct.

u0=4*pi*realpow(10,-7); ur=1; e0=8.85*realpow(10,-12); er=5.3; con=5.8*realpow(10,7); cond=5*realpow(10,-6); ra=1.128e-3; s=6*ra; L=(u0/pi)*log((s/(2*ra))+sqrt((s/(2*ra)).^2 - 1)); C=(pi*e0*er)/(log((s/(2*ra))+sqrt((s/(2*ra)).^2 -1))); G=(pi*cond)/(log((s/(2*ra))+sqrt( (s/(2*ra)).^2 -1))); RS=50; l=20; RL=91.84; n=10000; f=1:n:100000000; [n2 m2]=size(f); ts=1e-9; t=[0:1:299]*ts; [n1 m1]=size(t); R_Surface=sqrt((pi*f*u0*ur)/con); R=(((R_Surface)/(pi*ra))*((s/(2*ra))/sqrt((s/(2*ra)).^2 - 1))); Bpsk Ber Matlab Code As with BPSK, there are phase ambiguity problems at the receiving end, and differentially encoded QPSK is often used in practice. But I can not explain why BER can not be greater than 0.5 even the distance is increased up top very large value.

Reply mena elia February 15, 2013 at 8:02 pm mimo ofm zero force equalizer Reply Neetu January 22, 2013 at 11:15 pm Hi, Can you plz provide the simulink model i m working on the above scenario. for that i have to show RS and CC alone.. Bit-error-probability-for-bpsk-modulation Given that radio communication channels are allocated by agencies such as the Federal Communication Commission giving a prescribed (maximum) bandwidth, the advantage of QPSK over BPSK becomes evident: QPSK transmits twice

How we can get N samples (at the receiver side) as input to FFT from (1+alpha)T interval? Retrieved December 20, 2015. ^ Communications Systems, H. Reply Krishna Sankar July 6, 2009 at 5:15 pm @Saria: There will be normailzation factors defined based on the modulation schemes. news Click Plot.Visible Results of the Semianalytic ExampleAfter you click Plot, BERTool creates a listing for the resulting data in the data viewer.

Reply Krishna Sankar August 19, 2009 at 5:33 am @Sami: My replies: 1/ To be statistically accurate, we need more number of samples. berVec(:,jj) = step(hErrorCalc, msg(2:end),decodmsg(2:end)); else berVec(:,jj) = step(hErrorCalc, msg, decodmsg); end end % Error rate and 98% confidence interval for this EbNo value [ber(jj), intv1] = berconfint(berVec(2,jj),berVec(3,jj)-1,.98); intv{jj} = intv1; % Generated Sun, 02 Oct 2016 12:46:50 GMT by s_hv1002 (squid/3.5.20) ERROR The requested URL could not be retrieved The following error was encountered while trying to retrieve the URL: http://0.0.0.9/ Connection Hope to do so in future.

This kind of encoding may be demodulated in the same way as for non-differential PSK but the phase ambiguities can be ignored. I had discussed on how the normalization factor for an M-QAM modulation is derived @ http://www.dsplog.com/2007/09/23/scaling-factor-in-qam/ Hope this helps. Extrapolating BER data beyond an order of magnitude below the smallest empirical BER value is inherently unreliable.For a full list of inputs and outputs for berfit, see its reference page.Example: Curve Reply Krishna Sankar November 17, 2010 at 4:57 am @mimo: Looks fine.

Please see the post http://www.dsplog.com/2008/02/17/cylcic-prefix-in-orthogonal-frequency-division-multiplexing/ for a brief intro into cyclic prefix and its use in OFDM Reply Newbie April 5, 2010 at 6:00 am Sorry I have a stupid Am writing another post with comparing Eb/N0, Es/N0, SNR etc. http://blog.csdn.net/mike190267481/article/details/7235028 Regards! clear; flag=-4; while flag==-4 N=input(‘number of data='); if N<=0 || mod(N,1)~=0 disp('numberof data is not valid'); else flag=flag+1; end end while flag==-3 time_step=input('time step='); if time_step=1 || (1/time_step)<2*N if time_step=1 disp(‘time

Reply Krishna Sankar February 26, 2012 at 6:02 am @raju: sorry, am not familiar with the topic Reply Raul February 21, 2012 at 5:35 am Hello Krishna. In differentially encoded QPSK (DQPSK), the phase-shifts are 0°, 90°, 180°, −90° corresponding to data '00', '01', '11', '10'. Best Regards, Zhongliang Reply Krishna Sankar December 22, 2009 at 5:46 am @Zhongliang: Well, I think fft(n) has the same statistical property as n, and hence we get the same result. Comparing Theoretical and Empirical Error RatesThe example below uses the berawgn function to compute symbol error rates for pulse amplitude modulation (PAM) with a series of Eb/N0 values.

After artificially adding noise to the encoded message, it compares the resulting noisy code to the original code. For that first I am trying to get probability of error rate vs snr of different modulation techniques. Reply Egerue Nnamdi November 10, 2009 at 3:42 pm Hi krishna Pls in essence how and where do we set the different values for EbNo/ or S/N or SNR to BERTool plots the data in the BER Figure window, adjusting the horizontal axis to accommodate the new data.

Using gamma-gamma channel model. Typically some subcarriers at the edge are left unused to ensure spectrum roll off. Generated Sun, 02 Oct 2016 12:46:50 GMT by s_hv1002 (squid/3.5.20) n = 10000; % Number of symbols to process k = log2(M); % Number of bits per symbol % Convert from EbNo to SNR. % Note: Because No = 2*noiseVariance^2, we

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