HammingDecoder
ptolemy.actor.lib.comm.HammingDecoder

Decode a (<i>n</i>, <i>k</i>) Hamming code, where <i>n</i> is specified by parameter <i>codedRate</i> and <i>k</i> is specified by parameter <i>uncodedRate</i>. <p> The Hamming code can correct one-bit error. To encode a Hamming code, the HammingCoder consumes <i>k</i> information bits during each firing and consider them as a row vector <i><u>X</u></i>. Its Hamming code is <i><u>Y</u></i> = <i><u>X</u></i> * G. <p> If there is no error in <i><u>Y</u></i>, <i><u>Y</u></i> * H<sup>T</sup> should be a zero vector of length <i>n - k</i>. Otherwise <i><u>S</u></i> = <i><u>Y</u></i> * H<sup>T</sup> is called the syndrome. Let <i><u>S</u></i> be the i-th column of H. The HammingDecoder declares there is an error at the i-th element of <i><u>Y</u></i>. <p> For more information on Hamming codes, see HammingCoder and Proakis, Digital Communications, Fourth Edition, McGraw-Hill, 2001, pp. 448-450. <p>

Author(s): Ye Zhou
Version:$Id: HammingDecoder.doc.html,v 1.1 2006/02/22 18:40:27 mangal Exp $
Pt.Proposed Rating:Red (eal)
Pt.Accepted Rating:Red (cxh)




uncodedRate
Integer defining the uncode block size. It should be a positive integer. Its default value is the integer 4.
codedRate
Integer defining the Hamming code block size. This parameter should be a non-negative integer. Its default value is the integer 7.