Time Division Multiplexing - Synchronous & Statistical?

ferrero's Avatar, Join Date: May 2009
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Can someone pls tell me what are they used for & whats the differnece between their characteristics?

Thanks
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SaswatPadhi's Avatar, Join Date: May 2009
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Read here : http://en.wikipedia.org/wiki/Time-division_multiplexing
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ferrero's Avatar, Join Date: May 2009
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hey thanks for the link
you come to my rescue again


i having alot of problems in my assigments can you check if i did the following correctly?


Consider a transmission system using Cyclic Redundancy Check (CRC) technique with a
generator polynomial
10101. The receiver receives the following bit pattern:

100111011000.

(a) Draw a digital logic circuit for a shift register implementation of CRC.
[8 marks]

so supposed i am supposed to place the XOR circuit to the right of any position for which the associated value for P(X) is one, i think it should be


A <---B + C <---D +


Can you help me out on this? thanks





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SaswatPadhi's Avatar, Join Date: May 2009
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I think you are right

Code:
  *----------------*------------------*
  |                |                  |
 \_/              \_/                 |
  *-- A -----> B --+--> C -----> D ---+-<--  Input
(* means a joint, + means XOR).

I hope it's correct
I get the output as 10100101011

Last edited by SaswatPadhi; 17May2009 at 09:28..
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ferrero's Avatar, Join Date: May 2009
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yeah... same ans as yours

how i wish you can go for the exams for me haha
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SaswatPadhi's Avatar, Join Date: May 2009
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.. LOL ..

Best of luck for your exams..
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ferrero's Avatar, Join Date: May 2009
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Hi Saswapadhi

i have one more question but its hard to state the whole question here

I attached my tutorial... its question 2... can you explain to me what is bit sequence? and what r they actually asking?

Attached Files
File Type: pdf TMA01 version 2.pdf (138.5 KB, 14 views)
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SaswatPadhi's Avatar, Join Date: May 2009
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OK, I'll go through it and try to answer to the best of my knowledge
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ferrero's Avatar, Join Date: May 2009
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oh thanks my saviour! will wait for ya!
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SaswatPadhi's Avatar, Join Date: May 2009
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OK, I read the question .. it's pretty straight forward :

For each of the periods (1 to 8), just check the amplitude of the waveform, and its phase difference with respect to the previous period. Then write the 3-bit symbol from the table, corresponding to it.

E.g., for the first period, the symbol is 001, 'cuz amplitude is A2 and phase difference is 0.
for the second period, the symbol is 010, 'cuz amplitude is A1 and phase difference is 1/(4f).

I won't complete the answer 'cuz that would be a spoiler. Try it yourself and if you can't then I'll try to post complete answer.