Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2007-09-04
2007-09-04
Lugo, David B. (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S144000
Reexamination Certificate
active
10411352
ABSTRACT:
The invention relates to a method for multiple access interference suppression and to a receiver applying the method. A preliminarily detected signal is spreading coded and channel distorted in a MAI estimator (350) for generating an estimate signal (274) corresponding to a received and reception-filtered signal. Pulses (360) corresponding to a signal component of each path of each user are generated from the signal in a pulse generator block (300), and the pulses are combined according to path delays into a pulse sequence (362) in a combiner (310). In a filter (312), the pulse sequence (362) is subjected to waveform filtering, which is the convolution of reception filtering and pulse shaping filtering. Finally, in a summer (220), the estimate signal (274) is subtracted from the received and reception-filtered signal (270) to cancel multiple access interference.
REFERENCES:
patent: 5787130 (1998-07-01), Kotzin et al.
patent: 6473415 (2002-10-01), Kim et al.
patent: WO 01/45287 (2001-06-01), None
patent: WO 01/89106 (2001-11-01), None
patent: WO 02/03561 (2002-01-01), None
Kim et al, “Multi-Mode Subtractive Interference Cancellation For Asynchronous Multi-Path Channels” Vehicular Technology Conference, 1999 IEEE 49thHouston TX, USA May 16-20, 1999, Piscataway, NJ, USA, IEEE, US, May 16, 1999, pp. 1430-1434.
Lugo David B.
Nokia Corporation
Squire Sanders & Dempsey L.L.P.
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