STMicroelectronics Asia Pacific Pte.
Ltd., Singapore (SG)
Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 903 days.
Jun. 29, 2004
(65) Prior Publication Data
US 2005/0286656 Al Dec. 29, 2005
H04L 27/06 (2006.01)
H04L 25/08 (2006.01)
U.S. CI 375/340; 375/346
Field of Classification Search 375/232,
375/242, 254, 262, 265, 340, 341, 346, 350;
714/794, 795 See application file for complete search history.
7,231,577 2002/0025008 2002/0067780 2002/0126776 2003/0007577 2003/0138054
U.S. PATENT DOCUMENTS
B2* 6/2007 Richardson et al 714/758
Al 2/2002 Jurgensen et al.
Al * 6/2002 Razzell 375/341
Al 9/2002 Mucketal.
Al* 1/2003 Shiuetal 375/341
Al 7/2003 Haetal.
* cited by examiner
Primary Examiner—Young T. Tse
(74) Attorney, Agent, or Firm—Lisa K. Jorgenson; William A. Munck
The range R of effective bits (those containing information) within the N bit output(s) from an inner modem is determined and employed to select the M soft bits passed to a channel decoder, thereby avoiding underflow or overflow degrading the channel decoder performance. The average and standard deviation of IP values for a base-two logarithm of the N bit output are used to determine the range R of effective bits, with the N bits shifted and clipped based on the computed value of R so that the M most significant bits from that range R are passed to the channel decoder.
18 Claims, 4 Drawing Sheets