公开(公告)号：DE112007000206T5

公开(公告)日：2008-12-11

申请号：DE112007000206

申请日：2007-01-08

Applicant: MOTOROLA INC

Inventor： HUANG JIAN ,  ALLEN VERNON A ,  NIU FENG ,  SHI QICAI

IPC: H04L12/28 ,  H04J1/16

Abstract: During operation a node (500) that has associated with a network (100) will periodically broadcast a beacon (303) during a beacon interval as part of a superframe. The beacon will be periodically broadcast for a first period of time, based on a time it takes for nodes to associate with the network. After the first period of time has passed, the beacon will be switched off for a second period of time, after which, the beacon will again be periodically broadcast.

公开(公告)号：AU3513102A

公开(公告)日：2002-05-27

申请号：AU3513102

申请日：2001-11-19

Applicant: MOTOROLA INC

Inventor： SHI QICAI

IPC: H04B1/7077

Abstract: A system for synchronizing a DS-CDMA receiver (106) to a received signal (700) using actual data as opposed to a special training sequence is provided. A chip by chip multiplication (910, 1304) is applied to a sequence of received chip complex values in order to eliminate most traces of bit sign information from the received signal (700). The foregoing allows multiple bit length sequences of chips extracted from actual data to be combined, e.g., averaged, in order to reduce random noise. A low noise vector which has been derived from actual data can then be used to synchronize (1312) the receiver (106) to a desired degree of precision.

公开(公告)号：AT437503T

公开(公告)日：2009-08-15

申请号：AT04814431

申请日：2004-12-15

Applicant: MOTOROLA INC

Inventor： KYPEROUNTAS SPYROS ,  ANDRIC OLEG ,  CORREAL NEIYER S ,  HUANG JIAN ,  NIU FENG ,  SHI QICAI

IPC: G01S19/14 ,  H04L12/56 ,  G01S5/02 ,  G01S19/49 ,  H04Q7/38

公开(公告)号：DE112007000205B4

公开(公告)日：2010-01-21

申请号：DE112007000205

申请日：2007-01-08

Applicant: MOTOROLA INC

Inventor： HUANG JIAN ,  CHIOU WAYNE W ,  SHI QICAI

IPC: G06F15/16

Abstract: A method and apparatus for determining a node's proper duty cycle is provided herein. All nodes (500) within a network (100) will interactively switch duty-cycles based on a number of hops a device is from a personal area network coordinator PNC. Changing duty cycles based on a number of hops from a PNC assures that spatial patterns of duty-cycles form in a network to maximize data throughput and minimize network wide power consumptions.

公开(公告)号：DE112004001902T5

公开(公告)日：2006-09-14

申请号：DE112004001902

申请日：2004-10-01

Applicant: MOTOROLA INC

Inventor： GORDAY PAUL E ,  CALLAWAY EDGAR HERBERT ,  MARTIN FREDERICK L ,  SHI QICAI

IPC: H04B1/16 ,  H03D5/00 ,  H04B1/40 ,  H04L27/00 ,  H04L27/16

Abstract: The present invention provides a multimode receiver design for mitigation of frequency offset by selective demodulation of an input modulated signal. The receiver ( 103 ) comprises a plurality of demodulators ( 207 ). Each of the plurality of demodulators ( 207 ) has the same functionality but different receiver sensitivity versus frequency-offset mitigation characteristics. Each of these demodulators incorporates a different demodulation technique. A suitable demodulator is selected to demodulate the received signal. The choice of a suitable demodulator is based on the value of the frequency offset ( 305, 307 ).

公开(公告)号：DE112004000704T5

公开(公告)日：2006-04-20

申请号：DE112004000704

申请日：2004-04-20

Applicant: MOTOROLA INC

Inventor： KYPEROUNTAS SPYROS ,  NIU FENG ,  SHI QICAI

IPC: H04W40/32 ,  H04W64/00 ,  H04W84/18

Abstract: A method for locating nodes in a multi-hop sensor network forms a rigid body (RB 1 , RB 2 , RB 3 ) and, from the nodes, utilizes the rigid body to decide if a node is locatable. The method obtains a reduced order model (ROM) of the network by categorizing all of the nodes by location status, grouping them based upon the categorizations, and defining and identifying a rigid body from a group. The method further simplifies determinability of node location by forming the rigid body from the nodes based upon the categorized location status. To locate the nodes, the nodes are separated from one another into subsets dependent upon characteristics ( 100 ). Then, groups are formed from one subset ( 200 ) and the rigid body is formed from a group ( 300 ). The ROM is formed from the rigid body ( 400 ) and a location capability of the rigid body is evaluated based upon the ROM ( 500 ).

公开(公告)号：DE602004022196D1

公开(公告)日：2009-09-03

申请号：DE602004022196

申请日：2004-12-15

Applicant: MOTOROLA INC

Inventor： KYPEROUNTAS SPYROS ,  ANDRIC OLEG ,  CORREAL NEIYER S ,  HUANG JIAN ,  NIU FENG ,  SHI QICAI

IPC: G01S19/14 ,  G01S5/02 ,  G01S19/49 ,  H04L12/56 ,  H04Q7/38

公开(公告)号：DE112007000205T5

公开(公告)日：2008-11-13

申请号：DE112007000205

申请日：2007-01-08

Applicant: MOTOROLA INC

Inventor： HUANG JIAN ,  CHIOU WAYNE W ,  SHI QICAI

IPC: G06F15/16

Abstract: A method and apparatus for determining a node's proper duty cycle is provided herein. All nodes (500) within a network (100) will interactively switch duty-cycles based on a number of hops a device is from a personal area network coordinator PNC. Changing duty cycles based on a number of hops from a PNC assures that spatial patterns of duty-cycles form in a network to maximize data throughput and minimize network wide power consumptions.

公开(公告)号：DE112004002467T5

公开(公告)日：2006-10-19

申请号：DE112004002467

申请日：2004-12-17

Applicant: MOTOROLA INC

Inventor： SHI QICAI ,  CORREAL NEIYER S ,  HUANG JIAN

IPC: G01S5/00 ,  G01S19/12 ,  G01S5/02 ,  G01S19/07 ,  G01S19/11 ,  G01S19/31 ,  G06F12/00 ,  G06Q90/00 ,  G07C11/00 ,  H04Q7/20

Abstract: A method and apparatus for locating a remote unit (or node) is provided herein. During operation, location-finding equipment ( 106 ) will determine a gross location of non-located nodes ( 104 ) by determining distances of the nodes ( 104 ) to reference nodes ( 105 ). Additionally an error estimate in the location for each node is determined. A first subset of nodes having relatively lower error estimates are "promoted" to reference nodes, and a second subset of nodes having higher error estimates are again located based on a distance to the newly-promoted reference nodes.

公开(公告)号：AU2002363980A1

公开(公告)日：2003-07-24

申请号：AU2002363980

申请日：2002-12-10

Applicant: MOTOROLA INC

Inventor： SHI QICAI ,  O'DEA ROBERT J

IPC: H04B1/709 ,  H04B15/00 ,  H04K1/00 ,  H04L27/30

Abstract: A method and apparatus for DS-CDMA communication having improved timing resolution. In the transmitter, a signal spread by a first sequence of pulses is generated with pulse shape given bywhere t is time and Tc is the chip period or pulse width. The pulses have an auto-correlation functionIn receiver, a second sequence of pulses with pulse shape given byis generated. When correlated with the first sequence of pulses the resulting correlation function is proportional toThis correlation function narrower peaks than the correlation functionthereby allowing higher time resolution to be achieved. The correlation function is achieved by modification of the transmitter or receiver modulation sequences or by modification of the correlator in the receiver.