1 Star2 Stars3 Stars4 Stars5 Stars (1 votes, average: 5.00 out of 5)
Loading ... Loading ...
Print Print

Contact

Contact via Email
Do you have technical doubts and need clarification? Ofcourse, I would be more than happy to answer them.

Please contact the author at
email

Related posts

  1. Summary – feedback on [dspLog], July 2008
  2. Join dspLog at Google FriendConnect
  3. OT: Happy Schools Blog
  4. OT: Prof. Randy Pausch’s lecture in Oprah show
  5. Download free e-book on error probability in AWGN

D id you like this article? Make sure that you do not miss a new article by subscribing to RSS feed OR subscribing to e-mail newsletter. Note: Subscribing via e-mail entitles you to download the free e-Book on BER of BPSK/QPSK/16QAM/16PSK in AWGN.

{ 109 comments… read them below or add one }

1 upasana July 18, 2009 at 4:02 pm

i am already a member so how can i download this book???

Reply

2 Krishna Pillai July 19, 2009 at 9:00 am

@upasana: I just mailed you the download instructions. Plz check.

Reply

3 rochak July 20, 2009 at 6:35 am

hi krishna,
can you suggest practical values regarding various parameters of rayleghigh faded channel for various conditions. i.e. flat faded, frequency selective etc.

another problem is related with the matlab that, how to calculate the time taken for execution of any program.

Reply

4 Krishna Pillai July 20, 2009 at 7:14 pm

@rochak: Well, whether the channel is flat fading or frequency fading depends on the transmit symbol duration too. If the duration of the symbol is more than the duration of the channel, the channel is flat fading.

You may also want to check http://en.wikipedia.org/wiki/Fading

For computing the execution time in Matlab you may use tic-tac. Put tic before the command you want to execute and tac after the command. It will show the time it took for execution.

Reply

5 Nihar August 5, 2009 at 4:29 pm

i am already a member so how can i download this book???

Reply

6 Krishna Sankar August 10, 2009 at 5:46 am

@Nihar: I just emailed you the download instructions. Plz check.

Reply

7 farrakh August 8, 2009 at 4:43 pm

how can i download the ebook’ ebook on error probability in AWGN’ . i m already subscribed at dsplog.com

Reply

8 Krishna Sankar August 11, 2009 at 4:41 am

@farrakh: I just mailed you the download instructions. Plz check.

Reply

9 kishoredaparti August 12, 2009 at 2:28 pm

hi, krishna pillai, i,m already a member of dsp lo, But i don,t know how can i download the book, can u plz send me the instructions

Reply

10 Krishna Sankar August 14, 2009 at 5:01 am

@kishoredaparti: I emailed you the download instructions. Plz check.

Reply

11 lee waen August 18, 2009 at 8:08 am

Dear Kirshna

you are doing very well on ur blog .. you uploaded the MRC and transmit beamforing.. MRC is very clear and also it is for multple antennas but transmit diversity SNR is not shown clear and also it is not shown for multiple antennas..
so plz can you show the difference between MRC and MRT in the SNR behaviour and BER in ur coming work. and also show the SNR of MRT for multiple antenas

Reply

12 Krishna Sankar August 19, 2009 at 5:35 am

@lee: I guess, your concern is that the SNR gain in transmit beamforming is not explained well. I will look into the post and add contents, if needed. Thanks for the feedback.

Reply

13 hassan August 20, 2009 at 9:09 pm

hey krishna,

i couldnt find any help in finding the Modulation error ratio , i have asked with various phd students they said me its impossible and we dont knw bla bla..
i have a signal constellation(or a signal), i passed it through AWGN and received it ,now of course due to AWGN the constellation point will be shifted ,now i want to knw abt the difference between the constellation point before and after awgn,bcz thats how we can find the Modulation Error ratio,

Reply

14 Krishna Sankar August 22, 2009 at 5:22 am

@hassan: Modulation Error Ratio is mean of the difference between ideal and received constellation.
Lets say I0, Q0 are ideal constellation and Ir,Qr are the received constellation, then the MER is
MER = E { (Ir-I0)^2 + (Qr-Q0)^2 }, where E{ } is the expectation operator.

The slides 19-to-25 in the following pdf should be helpful.
http://chapters.scte.org/cascade/SCTE%20CNR%20vs%20SNR.pdf

Reply

15 hassan August 24, 2009 at 6:18 pm

dear krishna,

thanks for helping me out ,i have two questions first of all how will i detect the position of any constellation on transmitter side, second issue is that on receiver side there will be alot of constellations bcz of noise , imean if a signal is at the transmitter side @ 4.2 on graph then at that point in receiving constellation there will be lots of point of constellation, now i want to knw that how to locate the constellation point in matlab , i knw how to do it maually but dont knw that how to do it by program.

Reply

16 Krishna Sankar August 30, 2009 at 10:59 am

@hassan: My replies:
1/ At the transmitter, we know the type of symbol to send. For eg, in BPSK its {-1,+1}, QPSK 1/sqrt(2)*{+1+j,1-j,-1+j,-1-j} and so on
2/ At the receiver, we define threshold boundaries for determining the transmitted constellation. For eq, if we are using BPSK we keep the
threshold to 0 for determining the constellation i.e any received value above 0 is assumed to be 1, and any received value below 0 is assumed to be -1.
Some of these posts might be helpful
http://www.dsplog.com/2007/08/05/bit-error-probability-for-bpsk-modulation/
http://www.dsplog.com/2007/12/09/symbol-error-rate-for-16-qam/

Reply

17 hassan August 20, 2009 at 9:14 pm

wants to add in my previous commment question that the contellation after the modulation will be lots of constellation which will be acting like anoise ,so basically i need to knw the difference between the noised( receive constellation ) and the original (transmitted) constellation .

Reply

18 hassan August 21, 2009 at 10:44 pm

i would like to know that how to plot my signal in the form of eye diagram , if i dnt want to use any toolbox, i have found command on matlab
% Create an eye diagram scope object
h = commscope.eyediagram;
% Prepare a noisy sinusoid as input
x = awgn(0.5*sin(2*pi*(0:1/100:10))+ …
j*0.5*cos(2*pi*(0:1/100:10)), 20);
% Update the eye diagram
update(h, x);
% Display the eye diagram figure
plot(h)

but if u see that the plotting is only for the h , if i have a signal how can i show it in the form of eye diagram.

your early response will be highly appreciated.

Syed

Reply

19 Krishna Sankar August 22, 2009 at 7:45 am

@hassan: For plotting the eye diagram, you need to group the transmit signal into groups of samples for 2 symbol durations and then plot them on top of each other. I have provided a brief example @
http://www.dsplog.com/2008/05/01/eye-diagram-plot-matlab-raised-cosine-filter/
Hope this helps.

Reply

20 hande September 2, 2009 at 8:57 pm

Hi,
I have a question about SNR calculation. If we have a received signal y=s+n,
is the SNR E[|s|^2/|n|^2 ] or is it E[|s|^2]/E[|n|^2]?

Thank you very much for your help.

Reply

21 Krishna Sankar September 8, 2009 at 5:21 am

@hande: It is E[|s|^2]/E[|n|^2]?

Reply

22 noor September 9, 2009 at 8:45 pm

I am working on ofdm modulation.I am working with simulink.can u please help me regarding this.if u have simulink of ofdm modulator then please do inform.
thanx

Reply

23 Krishna Sankar September 10, 2009 at 6:57 pm

@noor: Sorry, I do not have simulink. But, the following Mathworks file exchange link might be of help
http://www.mathworks.com/matlabcentral/fileexchange/3540
Good luck.

Reply

24 hassan September 12, 2009 at 4:00 am

hye krishna i want to know that
1- how to plot the SNR in color bcz i need to make compare between different diagram but that diagram in differnt m files snr plotting , so i am thinking to give every snr plotting a color so that i can analyze it , can u help me in that.
2 furthermore i have sent u an email regarding the problem i am facing which is just 1 line error and i am unable to solve it cuz it took me days to me to find out the problem but still unsolved, it is a bit chalenging error.

3 third thing is that krishna i need to knw that i have plottoed different values of SNR vs symbol error rate but krishna i want to knw that for example i am using 4qam modulation on ofdm and i pass a random signal with awgn, rayleigh and racian, now AWGN is giving me error prob(at 8db) of 10(^-1) while rician at 8db is giving me 10(^-2) something , i wanna knw only that lets say i have a random signal passing through awgn, rayleigh and rician at 8db snr , now which channel has to has more symbol error rate , please tell me abt these three channel
like as we increase snr what will happen to awgn , rivcian and rayleigh channel , and which one has has highest sym error rate .

three questions needs ur urgent attention.

Reply

25 Krishna Sankar September 14, 2009 at 5:28 am

@hassan: My replies
1/ Try >> help plot in Matlab/Octave. You will get info on how to plot in different colour, label, etc etc
2/ Is this regarding the LMS equalization? I have not yet looked into it.
3/ AWGN will have the lowest. I do not know the comparison between Rayleigh and Rician.

Reply

26 smoodliar September 13, 2009 at 7:48 pm

Hi krishna,

How do i download your free ebook?

Reply

27 Krishna Sankar September 14, 2009 at 5:32 am

@smoodliar: I emailed you the download instructions. Plz check.

Reply

28 Selvi October 6, 2009 at 6:14 am

Sir,I want to know the calculation for different parameters used in 802.11a standard e.g. T , Delta F, Frequency offset used in OFDM.

Reply

29 Krishna Sankar October 8, 2009 at 5:29 am

@Selvi: Hopefully the quiz
http://www.dsplog.com/2009/10/07/quiz-ieee-80211a-specifications/
might provide you some information.

Reply

30 Dristy October 20, 2009 at 7:18 pm

Hello,

1. How I can download the free e-books, related to BER in AWGN?
2. How I can come to the calculation of the equation
y= s + 10^(-Es_N0_dB(ii)/20)*n; % additive white gaussian noise
that you have written in the program: http://www.dsplog.com/db-install/wp-content/uploads/2008/04/scriptqpsk_ser.m. As in general sence I calculate only the signal is y=s+n;

I am very new in digital communication, please help me.

Thanx.

Reply

31 Krishna Sankar October 27, 2009 at 5:20 am

@Dristy: My replies
1/ I emailed you the instructions
2/ The term 10^(-Es_N0_dB(ii)/20) is to scale the noise voltage. It enables us to achieve the desired signal to noise ratio needed for the simulation. However, in the real world as you said, its y = s + n.

Reply

32 Deepika Balla October 29, 2009 at 3:46 am

Hi,
Could you tell me how to evaluate entropy H(X+S+Z; X+kS) where ‘k’ is a constant?

Reply

33 Krishna Sankar November 8, 2009 at 7:54 am

@Deepika Balla: Sorry, I do not know :)

Reply

34 Anirudh November 1, 2009 at 3:46 am

Hi can you please mail the e-book.
Really appreciate that….

Thanks in advance…

Reply

35 Krishna Sankar November 8, 2009 at 8:29 am

@Anirudh: Please subscribe to the email option. You will receive instructions on how to download the eBook.

Reply

36 Abrar November 9, 2009 at 6:57 am

Hi

I want to measure SER for BPSK and QPSK with same data bits.
N=10 % number of bits
randn(1,N)+j*randn(1,N)

for BPSK as SER=BER
but for QPSK how we make symbol from this data bits:

Thanks

Reply

37 Krishna Sankar November 12, 2009 at 5:40 am
38 Pankaj January 21, 2010 at 12:40 pm

How do i download your free ebook?

Reply

39 Krishna Sankar January 25, 2010 at 5:24 am

@Pankaj: I emailed you the download instructions.

Reply

40 baljit January 29, 2010 at 1:52 pm

sir could u pls snd me matlab code for gmsk+convolution interleaving using awgn channel.
i will be very grateful to u…

Reply

41 Krishna Sankar April 4, 2010 at 4:46 am

@baljit: I do not have all of these combined. But you may checkout
http://www.dsplog.com/tag/msk
http://www.dsplog.com/tag/viterbi

Reply

42 kuldeep January 30, 2010 at 11:38 am

Hello Sir,
I am writing code in MATLAB for Rate Compatible Punctured Convolutional Code. I am not getting the required results when I use puncturing, otherwise I am able to match the results for AWGN channel and QPSK and 8 PSK case.
Please tell me how should I depuncture the bits at receiver and what changes I should made in Viterbi Decoder.
Can I use normal viterbi decoder for this case by inserting the zeros at the place of punctured bits.
Suggest me some method. I will explain you in details if you find any problem.
Kuldeep

Reply

43 Krishna Sankar April 4, 2010 at 4:39 am

@kuldeep: Sorry, I have not discussed the Rate Compatible Punctured Codes. Let me try to study the same

Reply

44 Nico February 18, 2010 at 11:03 am

Hi,
Now, Im working on link budget analysis simulation. Do you have any article/lecture/matlab code about this topic? because I find difficulties to simulate it..
Looking forward to hear from you..

Thanx

Reply

45 Krishna Sankar March 31, 2010 at 5:41 am

@Nico: Sorry, I have not discussed any articles on link budget simulations

Reply

46 keerthi February 27, 2010 at 5:37 pm

hello sir
ur articles on dsplog.com are very helpful and quite interesting. many
many thanks for those articles. we wish u include many more articles
in the future
sir i shall be thankful to u if u can kindly explain me the
properties of WIDESENSE STATIONARY UNCORRELATED SCATTERING CHANNEL .
also suggest me sites or book names to go through this. I must
transmit bpsk, qpsk, 16psk,16qam symbols through this channel and
estimate the received symbol using kalman filtering

waiting for ur reply

Reply

47 Krishna Sankar March 30, 2010 at 4:59 am
48 keerthi February 27, 2010 at 5:40 pm

hello sir

also plz explain me the differences between the properties of awgn
channel and wssus channel((wide sense stationary uncorrelated
scattering channel), I must use matlab for simulation hence ii am in
want of these properties. sir, its a bit urgent plz reply
thank u

,waiting for ur reply

Reply

49 Krishna Sankar March 30, 2010 at 4:58 am

@keerthi: Well, AWGN is an additive noise – added due to the random movement of electrons in the receiver
scattering channel is a multipath channel – multiplicative in nature

Reply

50 Syed Asad March 10, 2010 at 12:11 am

Krishna you are doing an awesome job really, brother can you please help me in making my Assignment. the Statement is

compare the BER performance of QPSK, 16-QAM and 16-PSK in AWGN, Rayleigh, and Rician fading channel
i had made a code for QPSK & 16PSK but i m having pd in 16QAM
plz Help me. im waiting

Reply

51 Krishna Sankar March 29, 2010 at 6:46 am
52 Ankur March 10, 2010 at 4:07 pm

Hi Krishna,

I have already subscribed, but how shall i download the E-book?

Reply

53 Krishna Sankar March 29, 2010 at 6:42 am

@Ankur: I emailed you the instructions

Reply

54 mawkly March 12, 2010 at 1:06 pm

hi, krishna , i’m already a member of dsp lo, But i don’t know how can i download the book, can u plz send me the instructions

Reply

55 Krishna Sankar March 28, 2010 at 3:49 pm

@mawkly: I emailed you the instructions

Reply

56 Newbie April 6, 2010 at 8:17 am

Hi Mr.Krishna

I Have a basic question. I want to make simulation that compare OFDM and SC in frequency selective fading. How to make SC simulation in selective fading because i think SC still in Frequency domain and i think i can’t convolution every SC symbol with channels coefficient. Single carrier only in flat fading??? Or we can add DFT before we transmit SC symbols through the channels?? I’m confuse

Regards

Reply

57 Krishna Sankar April 13, 2010 at 5:24 am

@Newbie: You can convolve the time domain samples of SC with the multipath channel. The post on BER for BPSK with ISI might provide reference
http://www.dsplog.com/2009/11/29/ber-bpsk-isi-channel-zero-forcing-equalization/

Reply

58 ysn April 11, 2010 at 12:25 pm

Hi, Krishna. Thank you very much for your nice blog. It helps me solve a lot problems including MATLAB problem.

I’m just curious that lots of people who wrote before said ebook, but what does the ebook means? Is it just subscribing from you? Or there is specific ebook you made before? If it is, can you let me know how I can download yours?

I’ll come by here frequently and ask you a lot things :)
Thank you in advance!~

Reply

59 Krishna Sankar April 14, 2010 at 5:05 am

@ysn: Its a pdf. I emailed you the details on how to download

Reply

60 Newbie April 14, 2010 at 7:41 pm

Thank you Mr.Krishna
I’m new student in telecommunication field. I have so many question that make me confuse. I hope you can give me an explanation the difference of transmitting symbol between OFDM and SC. For ex. if we have 2 ofdm symbol how i can make these symbols through to the channel??? we convolve each of ofdm symbol with different channel coefficient (time varying) or we convolve 2 ofdm symbols directly with channel coefficient. And if we have 4 BPSK symbols how i make these symbols through to the channel??? I want to compare between SC and OFDM system. Please help me to solve my problem.

Thanks

Reply

61 Krishna Sankar April 18, 2010 at 2:11 pm

@Newbie: Well, there are no defined answers to your questions. In general, the channel can be modeled as an FIR filter and the idea is to convolve the time domain tx samples with channel taps. Channel taps can be time varying or static depending on the channel which you wish to simulate.

Reply

62 Newbie April 20, 2010 at 9:45 am

Thank you Mr. Krishna for ur explanation. I will try to ask other question later about OFDM and frequency selective fading channel because i don’t understand yet.

Regards

Reply

63 Krishna Sankar April 21, 2010 at 5:46 am

@Newbie: Ok

Reply

64 Romeo April 14, 2010 at 10:29 pm

hi, krishna , i’m already a member of dsp lo, But i don’t know how can i download the book, can u plz send me the instructions

Reply

65 Krishna Sankar April 18, 2010 at 2:14 pm

@Romeo: I emailed you the instructions

Reply

66 suma April 25, 2010 at 9:42 am

How do i download your free ebook?

Reply

67 Krishna Sankar April 26, 2010 at 6:21 am

@suma: I emailed you the instructions….

Reply

68 Pavel April 27, 2010 at 9:12 pm

Dear Krishna,

Can you please tell me where can I download a softcopy of Digital Communication: Third Edition, by John R. Barry, Edward A. Lee, David G. Messerschmitt. I need the chapters that talks about the BER calculation of MMSE and SIC. Please help

Reply

69 Krishna Sankar April 28, 2010 at 5:49 am

@Pavel: The book should be available in most stores. And there is also an eastern economy edition ….

Reply

70 nowfel May 6, 2010 at 6:58 pm

Can u please tel me how to e-mail your free ebook. Can u please email me the instructions?

Reply

71 Krishna Sankar June 24, 2010 at 4:18 am

@nowfel: I emailed you the download instrctions

Reply

72 Krishna Sankar June 24, 2010 at 4:18 am

@nowfel: I emailed you the download instructions

Reply

73 ananya May 9, 2010 at 12:52 pm

hello sir,
sir plz….reply fast

Reply

74 adisorn May 19, 2010 at 8:52 am

Hi,
How can i download free book?

Reply

75 Krishna Sankar June 24, 2010 at 4:11 am

@adisorn: I emailed you the download instructions

Reply

76 miline June 3, 2010 at 1:05 pm

Hi Krishna,

Is it possible to have details to download the ebook? Thank you very much for the blog very helpful

Thanks,

Reply

77 Krishna Sankar June 24, 2010 at 4:02 am

@miline: I emailed you the download instructions.

Reply

78 bijoy June 12, 2010 at 6:12 pm

Hi Krishna,

I would like to know how can I get octave installation with package for signal.

I haveinstalled v3.2.0 octave but without signal package and while trying to install signal package from octave I have to face a series of errors and still not fully succeeded in resolving all.
Though octave community is helping me, I would like to know how did you install octave with relevant packages for communication and signal processing ?

Thanks in advance
Bijoy

Reply

79 Krishna Sankar June 14, 2010 at 6:15 am

@bijoy: I have ubuntu. So, I just did sudo apt-get install ubuntu. For the additional packages, I think I downloaded the zip and kept the folder in the octave path :) Good luck.

Reply

80 elka August 6, 2010 at 7:07 pm

I am a subscriber but i didn’t find where to download the e-book.

Reply

81 Krishna Sankar August 10, 2010 at 5:04 am

@elka: I emailed you the instructions

Reply

82 jansi September 3, 2010 at 7:02 pm

dear krishna,
i am new to communication field.
i m need of simulating Bpsk and QPSK modulation schemes adding AWGN and its transmission in reyleigh fading channel to analyse the BER performance for differnt SNR values.
the carrier frequency haas to be 20 MHZ.
i am running out of time.
i would be useful if u could provide me with the matlab codes for dis.
pls do respond as soon as possible.
regards,
jansi

Reply

83 Krishna Sankar September 6, 2010 at 5:14 am
84 venkat November 15, 2010 at 10:33 am

hai, i am already a member and how can i download the ebook

Reply

85 Krishna Sankar November 15, 2010 at 9:18 pm

@venkat: I emailed you the instructions

Reply

86 miline November 15, 2010 at 9:25 pm

Hi Krishna,

Sorry but I didn’t receive your instruction sent to me on 3th june. Is it possible to resend to me?

Thanks a lot ,

Reply

87 Krishna Sankar November 16, 2010 at 3:14 am

@miline: I emailed the details again.

Reply

88 andjas November 17, 2010 at 11:43 am

Dear Krishna,

Can you mailed the instruction.

BR,

Reply

89 Krishna Sankar November 18, 2010 at 4:56 am

@andjas: I emailed you the details.

Reply

90 Rajesh November 22, 2010 at 8:50 am

how can i download the ebook’ ebook on error probability in AWGN’ . i m already subscribed at dsplog.com

Reply

91 Krishna Sankar May 26, 2011 at 6:06 am

@Rajesh: emailed you the instructions

Reply

92 Alex November 30, 2010 at 6:29 pm

Hi Krishna!
Please, help me to download your ebook.
Thanks!

Reply

93 Krishna Sankar May 26, 2011 at 6:05 am

@Alex:
Have you subscribed to email newsletter from dsplog.com.
If not, please click here to subscribe.
http://www.feedburner.com/fb/a/emailverifySubmit?feedId=1348583&loc=en_US

Once you have subscribed, you should have received a confirmation email. Please reply to that
email and you will receive email instructions on how to download the eBook.

Reply

94 Entisar December 1, 2010 at 2:04 am

Hi dear
Thanks for your helpful blog ..
how to get an access to the e-book on probability of error in AWGN.

Reply

95 Krishna Sankar May 26, 2011 at 6:05 am

@Entisar:
Have you subscribed to email newsletter from dsplog.com.
If not, please click here to subscribe.
http://www.feedburner.com/fb/a/emailverifySubmit?feedId=1348583&loc=en_US

Once you have subscribed, you should have received a confirmation email. Please reply to that
email and you will receive email instructions on how to download the eBook.

Reply

96 ahmed December 20, 2010 at 4:47 am

Can you mailed the instruction.

Reply

97 Willie February 11, 2011 at 11:14 pm

I just subscribe to your blog/site. How can I download the e-book?

Reply

98 Krishna Sankar May 26, 2011 at 6:00 am

@Willie: Emailed you the download instructions

Reply

99 Mahi February 26, 2011 at 6:22 pm

Hi Krishna,
Could you please tell how to download the book?
Thanks

Reply

100 Krishna Sankar May 26, 2011 at 5:58 am

@Mahi: Have you subscribed to email newsletter from dsplog.com.
If not, please click here to subscribe.
http://www.feedburner.com/fb/a/emailverifySubmit?feedId=1348583&loc=en_US

Once you have subscribed, you should have received a confirmation email. Please reply to that
email and you will receive email instructions on how to download the eBook.

Reply

101 moyeen May 6, 2011 at 1:32 pm

Dear Krishna,

How i can download free ebook.please sent me i am badly needed this book , because i have to submit my thesis paper on 30 may2011.

Reply

102 Krishna Sankar May 24, 2011 at 5:33 am

@moyeen: Have you subscribed to email newsletter from dsplog.com.
If not, please click here to subscribe.
http://www.feedburner.com/fb/a/emailverifySubmit?feedId=1348583&loc=en_US

Once you have subscribed, you should have received a confirmation email. Please reply to that
email and you will receive email instructions on how to download the eBook.

Reply

103 Ivan Silva September 13, 2011 at 3:32 am

Excelent posts and exemples. Congratulations Krishna!
Can you please e-mail me the e-book.
Thanks
Ivan – Brazil

Reply

104 ayush December 17, 2011 at 9:56 pm

I just subscribe to your site. How can I download the e-book?

Reply

105 Krishna Sankar December 21, 2011 at 7:04 am

@ayush: emailed you the instructions

Reply

106 SHWETA January 23, 2012 at 2:33 pm

hello,
i am working on DVB-H Tx and Rx design. i want to about hierarchical modulation development in DVB-H..how the mapping is done? how to write MATLAB code for the same. help me..

Reply

107 Krishna Sankar January 26, 2012 at 6:18 am

@SHWETA: Sorry, have not studied the DVB-H spec.

Reply

108 Lemonia January 25, 2012 at 1:09 pm

hello Mr Krishna

My name is Lemonia Tamvaki and I am a new user of Matlab. I try to understand the script for computing BER with Binary Convolutional Code and Viterbi decoding that I find in address
http://www.dsplog.com/db-install/wp-content/uploads/2009/01/script_bpsk_ber_awgn_convlutional_code_soft_viterbi_decode.m
But when I try to run the code there are some errors.

??? Error using ==> conv2
First and second arguments must be single or double.

Error in ==> conv at 40
c = conv2(a(:),b(:),shape);

Error in ==> theod5 at 37
cip1 = mod(conv(ip,[1 1 1 ]),2);

I am a new user of Matlab. I try to fix it by myself but it isn’t work.

Can you help me please?

Thank you

Lemonia Tambaki

Reply

109 Krishna Sankar January 26, 2012 at 6:23 am

@Lemonia: Not sure why you are seeing this error. I tried in Octave ver 3.0.5 and it went through.

Reply

Leave a Comment

{ 1 trackback }