Pulse or digital communications – Spread spectrum
Reexamination Certificate
2006-03-28
2006-03-28
Chin, Stephen (Department: 2634)
Pulse or digital communications
Spread spectrum
C370S209000, C370S242000
Reexamination Certificate
active
07020175
ABSTRACT:
A pilot signal enters a first MMSE receiver (201) and a second signal enters a second MMSE receiver (202). The first MMSE receiver (201) performs a channel estimate for the received pilot signal, determines a mean-square error of the pilot signal, and operates to minimize the mean-square error of the pilot estimate by constantly updating a weighting vector. An estimate of the pilot channel exits the first MMSE receiver (201). The MMSE weighting vector (206) is also fed into the second MMSE receiver (202) and is applied to the second channel. Symbol estimates (or in other embodiments, chip estimates) exit the second MMSE receiver (202) and enter channel circuitry (204), where normal channel processing occurs.
REFERENCES:
patent: 5455844 (1995-10-01), Ishikawa et al.
patent: 5479448 (1995-12-01), Seshadri
patent: 6175588 (2001-01-01), Visotsky et al.
patent: 6661856 (2003-12-01), Calderbank et al.
patent: 6678310 (2004-01-01), Andren et al.
patent: WO 99/18682 (1999-04-01), None
Huang, Howard, I, Chih-Lin “Improving Receiver Performance for Pilot-Aided Frequency Selective CDMA Channels Using a MMSE Switch Mechanism and Multipath Noise Canceller” IEEE 1997.
Chin Stephen
Haas Kenneth A.
Motorola Inc.
Pace Lalita W.
Ware Cicely
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