| US 7,580,445 B2 | ||
| Nonlinear precoding in code-division multiple access communication system | ||
| Xiaodong Wang, New York, N.Y. (US); and Mohammad Madihian, Plainsboro, N.J. (US) | ||
| Assigned to NEC Laboratories America, Inc., Princeton, N.J. (US) | ||
| Filed on Oct. 26, 2005, as Appl. No. 11/259,442. | ||
| Claims priority of provisional application 60/710060, filed on Aug. 22, 2005. | ||
| Prior Publication US 2007/0041428 A1, Feb. 22, 2007 | ||
| Int. Cl. H04B 1/69 (2006.01); H04L 27/28 (2006.01) | ||
| U.S. Cl. 375—146 [375/260] | 20 Claims |
| 11. A transmitter arrangement for a spread-spectrum transmission system, the transmitter arrangement comprising:
a channel state estimator for generating channel state information for multipath channels to K receivers, K≧2; and
a precoder for preceding incoming K×1 symbol vectors prior to transmission, the precoder comprising
a first feedback filter generated using the channel state information from the channel state estimator, the first feedback
filter being applied to a previously-precoded vector which is then subtracted from the incoming K×1 symbol vectors to cancel
intersymbol interference; and
a second feedback filter and a feedforward filter, the second feedback filter and the feedforward filter arranged so as to
use the channel state information to cancel multiuser interference along the multipath channels to the K receivers.
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