(54) CANCELLATION OF INTERFERENCE IN A COMMUNICATION SYSTEM WITH APPLICATION TO S-CDMA
(75) Inventors: Bruce J. Currivan, Dove Canyon, CA (US); Thomas J. Kolze, Phoenix, AZ (US); Gottfried Ungerboeck, Langnau (CH); Nabil R. Yousef, Foothill Ranch, CA(US)
(73) Assignee: Broadcom Corporation, Irvine, CA (US)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 264 days.
(21) Appl.No.: 11/522,842
(22) Filed: Sep. 18, 2006
(65) Prior Publication Data
US 2007/0009012 Al Jan. 11, 2007
Related U.S. Application Data
(63) Continuation of application No. 10/142,189, filed on May 8, 2002, now Pat. No. 7,110,434, and a continuation-in-part of application No. 09/652,721, filed on Aug. 31, 2000, now Pat. No. 6,778,611.
(60) Provisional application No. 60/367,564, filed on Mar. 26, 2002, provisional application No. 60/151,680, filed on Aug. 31, 1999.
(58) Field of Classification Search 375/144,
375/148-150, 152 See application file for complete search history.
(56) References Cited
U.S. PATENT DOCUMENTS
2004/0252668 Al * 12/2004 Ozukturketal 370/335
2005/0243897 Al * 11/2005 Lomp et al 375/146
2006/0056496 Al * 3/2006 Smeeetal 375/148
* cited by examiner
Primary Examiner—Don N Vo
(74) Attorney, Agent, or Firm—Garlick Harrison & Markison; Shayne X. Short
Cancellation of interference in a communication system with application to S-CDMA. A relatively straight-forward implemented and computationally efficient approach of selecting a predetermined number of unused codes is used to perform weighted linear combination selectively with each of the input spread signals in a multiple access communication system. If desired, the predetermined number of unused codes is always the same in each implementation. Alternatively, the predetermined number of unused codes is selected from within a reordered code matrix using knowledge that is shared between the two ends of a communication system, such as between the CMs and a CMTS. While the context of an S-CDMA communication system having CMs and a CMTS is used, the solution is generally applicable to any communication system that seeks to cancel narrowband interference. Several embodiments are also described that show the generic applicability of the solution across a wide variety of systems.
20 Claims, 30 Drawing Sheets