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The 3rd Annual Nigerian EMail Conference
Jacek Fedorynski writes "I present to you an urgent and confidential request: I request your attendance at The 3rd Annual Nigerian EMail Conference. This is an excellent opportunity to meet your distinguished colleagues, learn new marketing techniques, and spend your hard-earned money. Attending this conference demands the highest trust, security and confidentiality between us."
...of time.
Oh yeah? Who? What was his name? I want to write a story about it elsewhere...I need details. Thanks.
Ok, slightly offtopic, but got bandwidth after receiving all that Nigerian spam? Mad at SCO? Download a 5mb file from here or launch an unspecified number of wget processes:
a dmin.pdf
wget http://www.sco.com/images/pdf/eserver/eserver_sys
This way, you'll know how to administrate their linux server which they discontinued.
No, you get either one breast or your penis enlarged.
Remeber that spinning wheel on Wheel of Fortune?
Yeah.
I will now redundantly add my name to the end of my post. You know, in case you forgot me or something.
Trellis Description of a Convolutional Encoder
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A trellis description of a convolutional encoder shows how each possible input to the encoder influences both the output and the state transitions of the encoder. This section describes trellises, describes how to represent trellises in MATLAB, and gives an example of a MATLAB trellis.
The figure below depicts a trellis for the convolutional encoder from the previous section. The encoder has four states (numbered in binary from 00 to 11), a one-bit input, and a two-bit output. (The ratio of input bits to output bits makes this encoder a rate-1/2 encoder.) Each solid arrow shows how the encoder changes its state if the current input is zero, and each dashed arrow shows how the encoder changes its state if the current input is one. The octal numbers above each arrow indicate the current output of the encoder.
Figure 2-2: A Trellis for a 4-State Rate-1/2 Convolutional Encoder
As an example of interpreting this trellis diagram, if the encoder is in the 10 state and receives an input of zero, then it outputs the code symbol 3 and changes to the 01 state. If it is in the 10 state and receives an input of one, then it outputs the code symbol 0 and changes to the 11 state.
Note that any polynomial description of a convolutional encoder is equivalent to some trellis description, although some trellises have no corresponding polynomial descriptions.
Specifying a Trellis in MATLAB
To specify a trellis in MATLAB, use a specific form of a MATLAB structure called a trellis structure. A trellis structure must have five fields, as in the table below.
Table 2-4: Fields of a Trellis Structure for a Rate k/n Code Field in Trellis Structure
Dimensions
Meaning
numInputSymbols
Scalar
Number of input symbols to the encoder: 2k
numOutputsymbols
Scalar
Number of output symbols from the encoder: 2n
numStates
Scalar
Number of states in the encoder
nextStates
numStates-by-2k matrix
Next states for all combinations of current state and current input
outputs
numStates-by-2k matrix
Outputs (in decimal) for all combinations of current state and current input
Note While your trellis structure can have any name, its fields must have the exact names as in the table. Field names are case-sensitive.
In the nextStates matrix, each entry is an integer between 0 and numStates-1. The element in the ith row and jth column denotes the next state when the starting state is i-1 and the input bits have decimal representation j-1. To convert the input bits to a decimal value, use the first input bit as the most significant bit (MSB). For example, the second column of the nextStates matrix stores the next states when the current set of input values is {0,...,0,1}. To learn how to assign numbers to states, see the reference page for istrellis.
In the outputs matrix, the element in the ith row and jth column denotes the encoder's output when the starting state is i-1 and the input bits have decimal representation j-1. To convert to decimal value, use the first output bit as the MSB.
How to Create a MATLAB Trellis Structure
Once you know what information you want to put into each field, you can create a trellis structure in any of these ways:
* Define each of the five fields individually, using structurename.fieldname notation. For example, set the first field of a structure called s using the command below. Use additional commands to define the other fields.
s.numInputSymbols = 2;
The reference page for the istrellis function illustrates this approach.
* Collect all field names and their values in a single struct command. For example:
s = struct('numInputSymbols',2,'numOutputSymbols',2,..
'numStates',2,'nextStates',[0 1;0 1],'outputs',[0 0;1 1]);
* Start with a polyn
or
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it's fun, it's fast, it's neat!
btw - what the fuck is tenticle rape?
Educate yourself, hot tenticle pics here.
...when Gollum is winning awards and taco is diddl'ing with things like this....
You know, people in nigeria do more then just spam people. I can't belive this racist bullshit made the front page.
autopr0n is like, down and stuff.
I'm planning a BANANA CHAN script, for early next year, in which Banana gets a "Nigerian E-mail", believes the story, but doesn't fall victim -- instead, she ends up saving the lives of Nigerian Royalty, and she gets extremely rich from the "transfer of monies" ;)
You, sir, are my hero. And you even got modded up!
AOL just settled the lawsuit with Microsoft as part of a deal over media something-or-other. They got a measly $750 million out of it.