InterDigital Inc (IDCC)

[Gamco]

United States Patent 7,848,288
Kwak , et al. December 7, 2010
Method and apparatus for estimating channelization codes in a wireless transmit/receive unit

Abstract
A method and apparatus for estimating channelization codes in a wireless transmit/receive unit (WTRU) using blind code detection (BCD). A WTRU receives communication bursts and detects a midamble in the received burst. A candidate code list is generated in accordance with the detected midamble. The candidate code list includes channelization codes intended for both the intended WTRU and other WTRUs. Active channelization codes among the codes in the candidate list are identified, and the identified codes are forwarded to a multi-user detector (MUD). Since the orthogonal variable spreading factor code maintains the orthogonality between codes of different SF, SFs of other WTRUs follow the SF of the intended WTRU. Moreover, since the data for other WTRUs is not used in symbol processing after MUD, the performance of MUD for the intended WTRU is preserved with the SF ambiguity of other WTRUs.

Inventors: Kwak; Jaeyoung (Morganville, NJ), Grieco; Donald M. (Manhasset, NY), Pan; Kyle Jung-Lin (Smithtown, NY), Zeira; Ariela (Huntington, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 12/424,914
Filed: April 16, 2009
Related U.S. Patent Documents
Application Number Filing Date Patent Number Issue Date
11095400 Mar., 2005 7684378
60625906 Nov., 2004
Current U.S. Class: 370/329 ; 370/310; 370/331; 370/341; 370/350
Current International Class: H04W 4/00 (20090101)
Field of Search: 370/331,329,320,326,321,335,310,336,337,342,347