United States Patent 7,715,305
Pan , et al. May 11, 2010
--------------------------------------------------------------------------------
Data detection method and receiver
Abstract
A method of recovering data for use in a receiver that simultaneously receives a plurality of code division multiple access data signals, each data signal experiencing a similar channel response. A combined signal over the shared spectrum in a time slot is received and sampled. The combined signal comprises the plurality of data signals. The sampled signal is used to estimate the similar channel response, and a channel response matrix is constructed. A channel correlation matrix is constructed based in part on the estimated channel response matrix. A fast Fourier transform (FFT) decomposition of a circulant matrix approximation of the channel correlation matrix, and the sampled data signals, are used to determine a spread data vector. The spread data vector is despread to recover data from the matrix.
--------------------------------------------------------------------------------
Inventors: Pan; Jung-Lin (Selden, NY), Zeira; Ariela (Huntington, NY), De; Parthapratim (Camp Bell, CA)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 11/370,113
Filed: March 7, 2006
--------------------------------------------------------------------------------
Related U.S. Patent Documents
--------------------------------------------------------------------------------
Application Number Filing Date Patent Number Issue Date
11100901 Apr., 2005 7054300
10077527 Feb., 2002 6904036
09814346 Mar., 2001 6885654
60266932 Feb., 2001
60268587 Feb., 2001
--------------------------------------------------------------------------------
Current U.S. Class: 370/210 ; 370/335; 370/342; 370/441; 375/142; 375/150
Current International Class: H04J 11/00 (20060101); H04B 1/00 (20060101); H04B 7/216 (20060101)
Field of Search: 370/342,210,335,441 375/150,142
