Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-10-16
2009-02-24
Ghebretinsae, Temesghen (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S346000
Reexamination Certificate
active
07496131
ABSTRACT:
In a reception system of a base station according to the communication system of a PDMA, CDMA and the like, the reception signals from a plurality of users received on a plurality of antennas are frequency-converted by a frequency conversion circuit, and then converted into digital signals by an A/D converter to be applied to a DSP. The signal of a particular user is extracted from the input signal by an adaptive array. Also, the interference user signal component is removed by an interference canceller. Accordingly, the signal component of a desired user having the interference component caused by an unrequired user signal suppressed is output. Thus, the communication quality in a radio communication system such as a mobile communication system can be improved.
REFERENCES:
patent: 5387900 (1995-02-01), Plonsky et al.
patent: 5579304 (1996-11-01), Sugimoto et al.
patent: 5602832 (1997-02-01), Hudson
patent: 5646964 (1997-07-01), Ushirokawa et al.
patent: 5659584 (1997-08-01), Uesugi et al.
patent: 5915205 (1999-06-01), Chen
patent: 6128276 (2000-10-01), Agee
patent: 6131013 (2000-10-01), Bergstrom et al.
patent: 6222498 (2001-04-01), Ishii et al.
patent: 6449268 (2002-09-01), Doi
patent: 6694154 (2004-02-01), Molnar et al.
patent: 10-190495 (1998-07-01), None
patent: 11-205286 (1999-07-01), None
patent: 11-251959 (1999-09-01), None
patent: 2000-138605 (2000-05-01), None
Masaaki Fujii: “A Study on Joint Processing of Adaptive Array Antenna and MLSE for Multipath Countermeasure,” Technical Report of IEICE, Nov. 1995, 6 pages, with English translation of Abstract.
Kazuhiko Fukawa: “A Cascading Connection of Adaptive Array and Nonlinear Interference Canceller and its Performances,” 2 pages, with partial English translation regarding Structure and Operation of Proposed System, 1994.
Naoto Ishii et al.: “CDMA Multiuser Time-Space Interference Cancellation System,” 2 pages, with partial English translation regarding CDMA Time-Space Interference Cancellation System, May 1990.
Shousei Yoshida et al.: “CDMA Multi-Stage Interference Canceller Using Cancellation Moderating Factor with Short Demodulation Processing Delay,” 2 pages with partial English translation regarding Serial/Parallel Hybrid Structure Canceller, 1996.
Mamoru Sawahashi et al.: “Serial Canceler Using Recursive Channel Estimation by Pilot Symbols for DS-CDMA,” Technical Report of IEICE, Jul. 1995, pp. 43-48 with English translation of Abstract.
Masafumi Tsutsui et al.: “A Study of Interference Canceller with Array Antenna for High Rate Users in DS-CDMA Systems,” p. 492 with partial English translation regarding Structure of Interference Canceller Employing Array Antenna, 1997.
Edwards Angell Palmer & & Dodge LLP
Ghebretinsae Temesghen
Sanyo Electric Co,. Ltd.
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