Pulse or digital communications – Spread spectrum
Reexamination Certificate
2005-05-11
2009-02-10
Tran, Khanh C (Department: 2611)
Pulse or digital communications
Spread spectrum
Reexamination Certificate
active
07489719
ABSTRACT:
Training sequences, for transmittal with an individual data packet via a wireless communication channel, enable estimation of the channel impulse response (CIR) to provide values usable for correction of multipath and other transmission disturbances with enhanced security and avoidance of complex processing. Training sequences employing several groupings of pseudonoise sequences enable a receiver to derive several observations of the CIR for each data packet received. Averaging of values of the several CIR estimations provides a CIR estimation of increased accuracy usable in determining coefficients to adjust taps of an adaptive equalizer for signal correction for the data of the packet. Training sequences with use of distinct pseudonoise sequences in several individual groupings enhance security, while simplifying processing by avoidance of necessity for multiplication or division of complex functions. Training sequences, systems and methods are described.
REFERENCES:
patent: 5732113 (1998-03-01), Schmidl et al.
patent: 7149239 (2006-12-01), Hudson
patent: 2002/0176485 (2002-11-01), Hudson
patent: 2003/0067961 (2003-04-01), Hudson et al.
BAE Systems Information and Electronic Systems Integration Inc.
Robinson Kenneth P.
Tran Khanh C
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