Bidirectional turbo ISI canceller-based DSSS receiver for...

Details Bidirectional turbo ISI canceller-based DSSS receiver for... Bidirectional turbo ISI canceller-based DSSS receiver for...

2003-10-23

2009-10-20

Odom, Curtis B (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S229000, C375S232000, C375S233000, C375S346000, C375S348000, C375S350000

Reexamination Certificate

active

07606293

ABSTRACT:
A bidirectional turbo ISI canceller cancels precursor-ISI as well as postcursor-ISI in a received signal without incorporating a multiplicative feedforward equalization filter. This is accomplished by taking a three-step receiver design approach. In the first step, an optimal single-symbol RAKE receiver is designed to comprise a CMF, a codeword correlator bank, and an energy bias (EB) canceller under the assumption that no ISI is generated by preceding or trailing symbols. In a second step, a DFE is included for suppressing postcursor-ISI caused by a preceding symbol. Finally, a precursor ISI canceler is used to remove the remaining ISI caused by a trailing symbol. All three components may be integrated into a BTIC-based receiver applying turbo-iteration processing.

REFERENCES:
patent: 5056117 (1991-10-01), Gitlin et al.
patent: 6031866 (2000-02-01), Oler et al.
patent: 6223273 (2001-04-01), Kanekawa et al.
patent: 6546041 (2003-04-01), Fujimoto
patent: 6647077 (2003-11-01), Shan et al.
patent: 6678310 (2004-01-01), Andren et al.
patent: 2002/0131488 (2002-09-01), Allpress et al.
patent: 2003/0161421 (2003-08-01), Schmidt et al.
patent: 1128566 (2001-08-01), None
IEEE Std 802.11b/D8.0, Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications: Higher Speed Physical Layer (PHY) Ertension in the 2.4 GHZ hand, Sep. 2001.

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