InterDigital Inc (IDCC)

[Gamco]

United States Patent 7,548,577
Pan , et al. June 16, 2009
Frequency domain joint detection for wireless communication systems

Abstract
A method and apparatus for frequency domain joint detection for multicarrier code division multiple access (MC-CDMA) and spread orthogonal frequency division multiple access (OFDMA) systems are disclosed. The apparatus includes a receiver having a frequency domain joint detector, whereby channel distortion and data symbols are jointly equalized and detected by the frequency domain joint detector in a frequency domain. Users of the data symbols may be assigned all or a subset of subcarriers with variable spreading factor codes. Alternatively, the subset of subcarriers may be further divided into multiple partitions and the frequency domain joint detection may be performed on the subcarriers in the partition. The users are assigned a spreading code, which may be a Hadamard code, a spread complex quadratic sequence (SCQS) code or any type of orthogonal spreading code.

Inventors: Pan; Jung-Lin (Selden, PA), Tsai; Yingming (Boonton, NJ), Zhang; Guodong (Farmingdale, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 11/441,881
Filed: May 26, 2006
Related U.S. Patent Documents
Application Number Filing Date Patent Number Issue Date
60687834 Jun., 2005
Current U.S. Class: 375/130 ; 375/136; 375/147; 375/316; 375/340
Current International Class: H04B 1/00 (20060101)
Field of Search: 375/130,136,147,316,340