| US 7,551,664 B2 | ||
| Iterative and turbo-based method and apparatus for equalization of spread-spectrum downlink channels | ||
| Jianzhong (Charlie) Zhang, Irving, Tex. (US); Hoang Nguyen, Davis, Calif. (US); Giridhar Mandyam, Plano, Tex. (US); and Joe Dowling, Athlone (Ireland) | ||
| Assigned to Nokia Corporation, Espoo (Finland) | ||
| Filed on Sep. 17, 2004, as Appl. No. 10/943,565. | ||
| Prior Publication US 2006/0062283 A1, Mar. 23, 2006 | ||
| Int. Cl. H04B 1/00 (2006.01) | ||
| U.S. Cl. 375—147 [375/148; 375/140] | 34 Claims |
| 11. A system for receiving a signal from a spread-spectrum downlink channel, the system comprising:
a base station capable of transmitting a signal on the downlink channel; and
a terminal capable of receiving the signal from the downlink channel, and generating an estimate of a transmitted chip sequence
in accordance with an iterative process, wherein the iterative process comprises:
selecting soft bits or a soft symbols for a previously iteration of a transmitted chip sequence, both the soft bits and soft
symbols being seperately and individually available for selection;
calculating statistical information for the previous iteration of the transmitted chip sequence, the statistical information
being calculated as a function of the selected soft bits and soft symbols of the previous iteration of the transmitted chip
sequence; and
generating the estimate for a current iteration of the chip sequence based upon the statistical information.
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