Pulse or digital communications – Transmitters
Reexamination Certificate
2004-02-19
2009-12-15
Ahn, Sam K (Department: 2611)
Pulse or digital communications
Transmitters
Reexamination Certificate
active
07634020
ABSTRACT:
System and method for simplifying preamble detection and reducing power consumption in receivers. A preferred embodiment comprises a preamble made up of two sequences, a first sequence that is specified in the time domain and a second sequence that is specified in the frequency domain. The first sequence which comprises multiple copies of a time domain code sequence can allow easy detection of the preamble while the second sequence comprises multiple copies of a frequency domain code sequence and allows easy determination of the frequency response of the communications channel. A hierarchical sequence can be used to allow multi-stage correlation. This can result in a less complex correlator, hence lower power consumption. Piconets can use different code sequences to allow rapid determination of the source of a transmission without requiring the receiver to decode the entire transmission.
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Kohno, R., et al., “Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)”, doc.: IEEE 802.15-03/097r1, IEEE P802.15 Alternative PHY Call For Proposals, IEEE P802.15-021327r7, Japan, Mar. 2003.
Balakrishnan Jaiganesh
Batra Anuj
Dabak Anand
Ahn Sam K
Brady III Wade James
Neerings Ronald O.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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