MODD / Mr. Hansen	Name: ____________________
11/10/2010

The Hamming(11,7) Code

	This is your starting point: 6E36E4B2ABB60AD40A4382CD.
1.	The senior class, deep behind enemy lines, manages to send 12 bytes of data (represented in hex above) through a noisy communications channel. “Noisy” simply means that data _______________ are likely to occur.
2.	The data in #1 are not encrypted, really, but they are known to be in little-endian format. Before we can decipher them, we need to put them into standard big-endian format, as follows:
	________________________________________________________
3.	The final 8 bits in the big-endian representation are “chaff” (not data). Get rid of them, and write down the 11 bytes that remain:
	________________________________________________________
4.	Convert the 11 remaining data bytes into 8 (eight) 11-bit Hamming words. Give your answers in binary.
	____________________
	____________________
	____________________
	____________________
	____________________
	____________________
	____________________
	____________________
5.	Use the Hamming(11,7) code, consisting of 7 data bits and 11 total bits per word, to correct the errors and determine the true value of each of the 8 words above. Show work in some clear fashion if you desire partial credit. List the true values below:
	11 bits (corrected)	7 data bits (corrected)	ASCII character
	____________________	____________________	_____
	____________________	____________________	_____
	____________________	____________________	_____
	____________________	____________________	_____
	____________________	____________________	_____
	____________________	____________________	_____
	____________________	____________________	_____
	____________________	____________________	_____
6.	Write the 8-character message that the seniors sent. Be sure to distinguish between upper case and lower case. __  __  __  __  __  __  __  __