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AuthorTopic: Channel Modeling (Read 4 times)
gabriel
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Channel Modeling
« Result #1 Today at 1:26pm »
I am working on spatial channel modeling. My problem is that I generated a channel matrix per tap (=path) : H_tap of dimension [Tx, Rx], where Tx and Rx is the number of Tx and Rx antennas respectively. For a system level simulation I have to calculate the simulated OFDM channel H with dimension [Tx Rx NoCarrier] (without taps). I did the following: I put all complex pathgains into a vector Hn and calculated: H = fft(Hn, noCarrier). Is this correct? The problem I have is that the H_tap have different path delays; i.e. the path delays are not equidistant. Do I have to account for that? What is the impact of the sampling frequency? I read that I have to interpolate the values. This is not clear for me. What happens if 2 or more paths fall into the same sampled tap? Do I have to add up the corresponding channel coefficients? What about unused sampled taps? Should I put a zero in it?
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AuthorTopic: Comments about the website (Read 388 times)
gulammohdrather
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Re: Comments about the website
« Result #2 on Dec 25, 2009, 12:49am »
This is the best website which provides information on different topics on communication engineering and technology
Many many thanks for this

GM rather NIT Srinagar
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AuthorTopic: Question about DFT math (Read 8 times)
mathenthusiast
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Question about DFT math
« Result #3 on Dec 24, 2009, 8:30pm »
Hello to everyone.

My question is this: When I compute the inverse DFT, I get the complex coefficients Ck. How to derive the real cos/sin coefficients Ak and Bk from them in order to construct an approximation of the original time-domain signal ? How does it happen that the imaginary unit "i" disappears ? What are the conditions and necessary steps to perform computations in such a way that the imaginary "i" doesn't spoil the computation and remains neutral ?

Thank you.
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AuthorTopic: Comments about the website (Read 388 times)
ty
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Re: Comments about the website
« Result #4 on Dec 23, 2009, 1:43pm »
I like the website and the tutorials. My back ground is communication but have not work in this field after graduated. Now, I think that I will change my job to communication field.

Let go to Loral website and apply for the job!

Does any body know other communication company beside Loral in the Bay area?

Thanks,ty

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AuthorTopic: Convolution Codes - viterbi algorithm.. Plz help (Read 8 times)
meintanis
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Convolution Codes - viterbi algorithm.. Plz help
« Result #5 on Dec 21, 2009, 1:28pm »
Plz, if anyone can help me with these problems..

I'd like to find any similar example with solution or tutorial..notes.. anything helpful..!

Thanks in advance :)

I.M.


Q1

Draw the encoder and state diagram for the (2, 1, 3) convolution code C with generator polynomials .G1=1+x^2 , G2=1+x+x^3

a. Use the state diagram to encode the messages

b. Use the state diagram to find the messages corresponding to the following codewords; 11 01 10 01 00 10 …. and 11 01 11 00 10 01 00 10 ….

Q2

Draw the encoder and state diagram for the (2, 1, 2) convolution code C with generator polynomials .G1=1+x^2 , G2=1+x+x^2

a. Use the state diagram to encode the message 01 11 01 10 11 10 00 11 …..

b. Use a Virterbi diagram to find the message (first 4 bits) from the codeword 10 01 10 01 11….. Let T=5 for the decoding process.



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AuthorTopic: v34 startup demodulation (Read 16 times)
jdunca18
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v34 startup demodulation
« Result #6 on Dec 18, 2009, 11:48pm »
Does any one know about any books or literature that detail the v34 modem startup sequence? I recorded the startup sequence to demodulate it using matlab and having some problems with phase lock loop locking etc.

Thanks,

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Result 7 of 10:
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AuthorAnnouncement: Charan needs help for her book (Read 1,178 times)
jdunca18
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Re: Charan needs help for her book
« Result #7 on Dec 18, 2009, 11:40pm »
I am a EE student and would love to work through your problems
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Result 8 of 10:
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AuthorTopic: Urgently need coding (MATLAB image processing) (Read 16 times)
damuvenkatesh
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Urgently need coding (MATLAB image processing)
« Result #8 on Dec 18, 2009, 4:12am »
hi...

I have a ieee paper..

"Reconstruction of Underwater Image by Bispectrum" published in the year 2007..... by Wen, Z.Y. Fraser, D. Lambert, A. Li, H.D.
New South Wales Univ., Canberra

http://rapidshare.com/files/322394922/Re...._Bispectrum.pdf

video of exeriment:



So i need coding for algorithm mentioned in above paper....

plz... need urgent...

Thank you... ;D ::) :D
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Result 9 of 10:
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AuthorTopic: plz help me (Read 28 times)
mathenthusiast
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Re: plz help me
« Result #9 on Dec 16, 2009, 4:27pm »
Not yet, I think. But, to be honest, what's the problem ? You can print the tutorials, can't you ?
Another good book I know of is at www.dspguide.com.
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Result 10 of 10:
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AuthorTopic: plz help me (Read 28 times)
sucre
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plz help me
« Result #10 on Dec 16, 2009, 9:33am »
can any body tell me, is this work of charan is available in book format. thnx
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