Turbo Codes are Low Density Parity Check Codes
David J C MacKay
Turbo codes and Gallager codes (also known as low density parity check
codes) are at present neck and
neck in the race towards capacity.
In this paper we write down the parity check matrix of
a Turbo code and note that it is actually a low density parity check matrix.
postscript (Cambridge UK).
postscript (Canada mirror).