公开(公告)号：SE9502703L

公开(公告)日：1995-10-02

申请号：SE9502703

申请日：1995-07-27

Applicant: MOTOROLA INC

Inventor： LOVE ROBERT TRISTAN ,  STEWART KENNETH A ,  RAPALA BRYAN

IPC: H04B1/707 ,  H04L27/227 ,  H04L27/22 ,  H04L27/38

Abstract: The present invention provides a downconverter method and apparatus for downconverting a multiphase modulated signal. The downconverter can be implemented in a multi-phase receiver such as a quadrature receiver. An analog-to-digital converter (103) converts an intermediate frequency signal to a digital signal at a sampling rate. A Hilbert transformation filter (104) and a delay element (105) connected in parallel provide respective passband quadrature and in-phase components of the digital signal. A digital translator (107) alters the passband quadrature and in-phase components based on a predetermined pattern to provide a baseband quadrature signal and a baseband in-phase signal. The digital translator (107) can be a pseudorandom sequence demodulator for demodulating a code division multiple access (CDMA) signal. Various types of DC estimation can also be provided in addition to automatic gain control.

公开(公告)号：EP1068688A4

公开(公告)日：2004-04-07

申请号：EP98965960

申请日：1998-11-13

Applicant: MOTOROLA INC

Inventor： STEWART KENNETH A ,  QIAO YI

IPC: H04K1/02 ,  H04B1/7105 ,  H04B7/08 ,  H04L27/18 ,  H04B1/707

CPC classification number: H04B1/7105 ,  H04B7/0854

Abstract: Joint detection of data signals occurs in a code division, multiple access (CDMA) communication system as follows: a digital signal processor (315) first extracts a midamble portion of transmitted signal vectors and generates an estimate of the channel response corresponding to each user-antenna pair using a channel estimator (401). In the preferred embodiment, each user's transmission within the communication system comprises either the type-1 or type-2 burst with varying midamble and guard period durations. Next, a convolution processor (402) forms the convolution of the user signature sequence with the channel impulse response estimate associated with each user and each of the antennas (308-310). A detector (403) utilizes the set of vectors and creates a set of sub-system matrices and solves the sub-system matrices to extract symbol information from an individual remote unit's transmission. Finally, the detector (403) outputs symbol information for subsequent infrastructure processing.

公开(公告)号：EP0917778A4

公开(公告)日：2003-01-29

申请号：EP97925661

申请日：1997-05-21

Applicant: MOTOROLA INC

Inventor： SEXTON THOMAS A ,  LING FUYUN ,  STEWART KENNETH A

IPC: H04L27/01 ,  H04B1/7085 ,  H04L7/00 ,  H04L7/033 ,  H04L7/10 ,  H04L27/22 ,  H04Q7/38 ,  H04B1/707 ,  H04B3/04

CPC classification number: H04B1/7085 ,  H04L7/0331

Abstract: The method includes acquiring a signal (501); inputting (502), at a first time, a received symbol to a demodulator having a plurality of outputs to produce a set of early outputs; inputting (504), at a second time, the received symbol to the demodulator to produce a set of on-time outputs; inputting (505), at a third time, the received symbol to the demodulator to produce a set of late outputs; and comparing (506) at least one output in the set of early outputs with at least one output in the set of late outputs to produce a timing measure.

公开(公告)号：EP1064744A4

公开(公告)日：2002-08-21

申请号：EP99904219

申请日：1999-01-22

Applicant: MOTOROLA INC

Inventor： STEWART KENNETH A ,  GARG SANJEEV

IPC: H04L1/00 ,  H04B1/7075 ,  H04B1/7077 ,  H04B1/7115 ,  H04B7/005 ,  H04B7/26 ,  H04J3/06

CPC classification number: H04W52/20 ,  H04B1/7075 ,  H04B1/7077 ,  H04B1/7115 ,  H04W52/50

Abstract: A call setup process (200) has a fast and robust preamble signal acquisition and acknowledgement procedure (400). The procedure (400) is a multistage search technique for first identifying with high probability the preamble signal and for verifying signal acquisition. The procedure (400) further includes power control (408/426/428) and rate determination (430) capability for enhanced call setup processing.

公开(公告)号：EP0827675A4

公开(公告)日：2001-05-16

申请号：EP97903749

申请日：1997-01-03

Applicant: MOTOROLA INC

Inventor： LOVE ROBERT T ,  STEWART KENNETH A ,  BAYER WILLIAM R

IPC: H04B7/005 ,  H04B7/26 ,  H04L1/20 ,  H04W52/12 ,  H04W52/26 ,  H04W52/36 ,  H04W52/40 ,  H04Q7/32 ,  H04J13/04

CPC classification number: H04W52/362 ,  H04L1/20 ,  H04W52/12 ,  H04W52/26 ,  H04W52/267 ,  H04W52/40

Abstract: Power control in a spread-spectrum communication system takes place by dynamically adjusting the step-down size of a power control threshold (407-415) based on an acquired number of poor-quality frames (405). The step-down size of the threshold is increased or decreased depending on an amount of frame erasures detected by the system (407-415). Additionally, full-rate or sub-rate frame quality is used to dynamically adjust the step-down size of a power control threshold.

公开(公告)号：EP1632096A4

公开(公告)日：2009-08-12

申请号：EP04751450

申请日：2004-05-05

Applicant: MOTOROLA INC

Inventor： LOVE ROBERT T ,  STEWART KENNETH A

IPC: H04B7/005 ,  H04B7/08 ,  H04L12/56 ,  H04W24/00 ,  H04W36/18 ,  H04W52/02 ,  H04W52/42

CPC classification number: H04W52/42 ,  H04B7/0814 ,  H04B7/0825 ,  H04B7/0877 ,  H04W24/00 ,  H04W36/18 ,  H04W52/0216 ,  H04W52/0245 ,  Y02D70/00 ,  Y02D70/1222 ,  Y02D70/1224 ,  Y02D70/1242 ,  Y02D70/1244 ,  Y02D70/164 ,  Y02D70/168 ,  Y02D70/444

Abstract: A wireless communications device (100) includes a primary radio frequency branch (134) and a diversity branch (136), which is enabled and disabled to balance performance and power consumption. Diversity mode operation of the device is controlled, for example, based on one or more of an estimated channel quality indicator, data reception, data rate, state or mode of the station, estimated signal to noise ratio of a pilot signal, battery power level, distance from a serving cell, among other factors.

公开(公告)号：EP1712023A4

公开(公告)日：2009-07-08

申请号：EP04815267

申请日：2004-12-22

Applicant: MOTOROLA INC

Inventor： PADMAJA PUTCHA ,  BURBIDGE RICHARD C ,  CAI ZHIJUN ,  STEWART KENNETH A

IPC: H04J1/00 ,  H04W4/00 ,  H04W4/06 ,  H04W24/00 ,  H04W28/18 ,  H04W68/00

CPC classification number: H04W72/005 ,  H04W48/16

Abstract: The present invention provides a method for receiving broadcast data in a system where broadcast data is transmitted on a plurality of frequencies. A user device monitors (302) a first frequency (108) for broadcast data to be transmitted on the first frequency. The device receives on the first frequency a notification of a broadcast data session which is to be sent on a second frequency (114) that is different from the first frequency. The device then determines a configuration associated with the second frequency and in accordance with receiving the broadcast data session and then configures (310) to receive the broadcast data session in accordance with the determined configuration. After receiving the broadcast data session, the device returns to monitoring the first frequency.

公开(公告)号：EP1683286A4

公开(公告)日：2007-10-17

申请号：EP04800571

申请日：2004-11-03

Applicant: MOTOROLA INC

Inventor： BURBIDGE RICHARD C ,  KUCHIBHOTLA RAVI ,  PUTCHA PADMAJA ,  STEWART KENNETH A

IPC: H04B20060101 ,  H04J3/16 ,  H04W4/06 ,  H04W24/10 ,  H04W88/02

CPC classification number: H04W72/005 ,  H04W24/10 ,  H04W88/02

Abstract: A method and apparatus for interrupting a transmission of a multicast signal includes a common channel selector (106) coupled to a receiver (102) to receive common channel information (116) therefrom. A repetition value calculator (108) receives measurement occasion information (118) from the common channel selector (106) to calculate a repetition factor (120). A system frame number comparator (110) determines if a channel measurement occasion (128) should be performed based on the repetition factor (120), a common identifier (124) and a largest common channel transmission time interval (122). The method and apparatus further includes a measurement occasion generator (112) coupled to the system frame number comparator (110), wherein if a measurement occasion is to be performed, a measurement occasion command signal (126) is provided to the measurement occasion generator (112) and the measurement occasion generator generates the channel measurement occasion (128).

公开(公告)号：EP0699334A4

公开(公告)日：1998-09-30

申请号：EP95907241

申请日：1994-12-22

Applicant: MOTOROLA INC

Inventor： STEWART KENNETH A ,  KOTZIN MICHAEL D

IPC: G10L19/04 ,  G10L19/00 ,  G10L19/12 ,  G10L19/14 ,  H03M7/30 ,  H04B7/216 ,  H04L1/00 ,  G10L9/00

CPC classification number: H04L1/20 ,  G10L19/16 ,  G10L19/18 ,  H04L1/0014

Abstract: A code division multiple access (CDMA) communication system reduces system self-interference and enhances system capacity by making rate selection decisions for individual speech encoders in concert with other speech encoders. The system utilizes perceptually weighted error metrics (401) as input into a rate controller (404) which determines and provides selected rates (402) back to the encoders (105). The system provides optimum voice quality and system capacity in that it allows specific encoders to decrease their rate, which improves capacity, as necessary while allowing other encoders to maintain their rates. This prevents needless degradation in voice quality at those times when system capacity needs to be temporarily increased.

公开(公告)号：EP1476946A4

公开(公告)日：2007-09-19

申请号：EP03715943

申请日：2003-01-21

Applicant: MOTOROLA INC

Inventor： BUCKLEY MICHAEL E ,  BACHU RAJA S ,  GHOSH AMITAVA ,  RATASUK RAPEEPAT ,  STEWART KENNETH A ,  VILLION MATHIEU

IPC: H03M13/00 ,  H03M13/09 ,  H03M13/23 ,  H03M13/27 ,  H03M13/29 ,  H04L1/00 ,  H04L1/18

CPC classification number: H04L1/1816 ,  H03M13/258 ,  H03M13/2957 ,  H03M13/6306 ,  H03M13/6381 ,  H04L1/0041 ,  H04L1/0066 ,  H04L1/0068 ,  H04L1/0071 ,  H04L1/1819 ,  H04L1/1845 ,  H04L1/1874 ,  H04L1/1887

Abstract: An improved turbo code based incremental redundancy includes a first step (102) of puncturing a data stream for a first transmission to provide a set of first unpunctured trellis sections. A next step (104) includes puncturing a data stream for a second transmission to provide a set of second unpunctured trellis sections. A next step (106) includes incremental redundancy combining the first and second transmissions of the trellises to provide non-adjacent first and second unpunctured trellis sections. The above arrangement results in a uniform distribution of punctured and unpunctured bits to provide lower errors.