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    METHOD AND DEVICE FOR DEMODULATION IN SPREAD SPECTRUM COMMUNICATION SYSTEM AND POWER CONTROL BIT DETECTION
    1.
    发明专利
    METHOD AND DEVICE FOR DEMODULATION IN SPREAD SPECTRUM COMMUNICATION SYSTEM AND POWER CONTROL BIT DETECTION 失效

    公开(公告)号：JPH1032560A

    公开(公告)日：1998-02-03

    申请号：JP9014997

    申请日：1997-03-25

    Applicant: MOTOROLA INC

    Inventor： LING FUYUN ,  BORTH DAVID E ,  FRANK COLIN D ,  RASKY PHILLIP D ,  KEPLER JAMES F

    IPC: H04B1/707 ,  H04B7/005 ,  H04B7/26 ,  H04J11/00 ,  H04J13/00 ,  H04L25/02

    Abstract: PROBLEM TO BE SOLVED: To attain improved demodulation for a spread spectrum communication signal including quick and accurate detection of a power control bit in a spread spectrum system. SOLUTION: A receiver circuit 400 receives a spread spectrum communication signal such as a DS-CDMA signal and conducts inverse spread processing and decoding. A channel phase and a channel gain for a communication channel are estimated from a pilot symbol of a pilot channel. The estimated value is provide to a demodulator 422 to demodulate a symbol of a traffic channel. Furthermore, a channel phase and a channel gain for a power control identifier are estimated from a pilot symbol. The estimated value is provided to a demodulator 424 to demodulate the power control identifier. The traffic channel symbol is delayed by a prescribed time in a delay element 420 before the demodulation. The power control identifier is delayed at a short delay element 418 or not delayed at all before demodulation.

    METHOD AND CIRCUIT FOR SERVICE DETECTION
    3.
    发明专利
    METHOD AND CIRCUIT FOR SERVICE DETECTION 失效

    公开(公告)号：JPH10256942A

    公开(公告)日：1998-09-25

    申请号：JP5006698

    申请日：1998-02-16

    Applicant: MOTOROLA INC

    Inventor： FRANK COLIN D ,  HONKISZ JENNIFER A ,  STORM BRIAN D

    IPC: H04B7/26 ,  H04Q7/36 ,  H04B1/707

    Abstract: PROBLEM TO BE SOLVED: To surely detect the availability of a CDMA(code division multiple access) service with a simple circuit constitution. SOLUTION: A radio telephone 121 uses a service detection circuit 125 which measures the energy of self-correlation of a reception composite CDMA signal and uses a different time delay for each measurement of the energy and is provided with at least one chip rate detector 109. A threshold detection circuit 127 couples measured energies, and the circuit 127 discriminates that the service is available of coupled energies exceed a threshold, but the circuit 127 discriminates that the service is not available if they don't exceed. Chip rate detectors 109 are coupled in parallel to be able to simultaneously measure the energy of self-correlation of the reception composite CDMA signal, or a single chip rate detector 109 can measure the energy of autocorrelation of the reception composite CDMA signal in series.

    COMMUNICATIONS DEVICE AND METHOD FOR INTERFERENCE SUPPRESSION IN DS-CDMA SYSTEM
    4.
    发明专利
    COMMUNICATIONS DEVICE AND METHOD FOR INTERFERENCE SUPPRESSION IN DS-CDMA SYSTEM 失效

    公开(公告)号：JPH11261531A

    公开(公告)日：1999-09-24

    申请号：JP36899098

    申请日：1998-12-25

    Applicant: MOTOROLA INC

    Inventor： MADHOW UPAMANYU ,  FRANK COLIN D ,  RASKY PHILLIP D

    IPC: H03M7/30 ,  G06F17/14 ,  H04B1/10 ,  H04B1/707 ,  H04B1/7107 ,  H04B1/7115 ,  H04B7/26 ,  H04J13/04

    Abstract: PROBLEM TO BE SOLVED: To provide a method and a device to completely suppress an interference vector in a DS-CDMA communications system. SOLUTION: Receiving branches 1 to 4 are allocated to a multi-path from both a sector that performs soft handoff and a sector that does not perform soft handoff (404 and 406). The set of a traffic channel included in a sector signal is decided for each receiving circuit (410). Interference is classified according to a prescribed interference condition for each receiving circuit (412). A set of interference vectors is selected from a classifying list of interference (414) and a desired code of a receiver or orthogonal projection of a Walsh code is calculated (416). Next, the receiving circuit inversely spreads received data by utilizing the orthogonal projection in its correlating device (418).

    LAKE RECEIVER AND FINGER MANAGING METHOD FOR SPREAD SPECTRUM COMMUNICATION
    5.
    发明专利
    LAKE RECEIVER AND FINGER MANAGING METHOD FOR SPREAD SPECTRUM COMMUNICATION 失效

    公开(公告)号：JPH11168448A

    公开(公告)日：1999-06-22

    申请号：JP27432698

    申请日：1998-09-10

    Applicant: MOTOROLA INC

    Inventor： LAROSA CHRISTOPHER P ,  CARNEY MICHAEL J ,  BECKER CHRISTOPHER J ,  EBERHARDT MICHAEL A ,  FRANK COLIN D ,  RASKY PHILLIP D

    IPC: H04B1/7113 ,  H04B1/7115 ,  H04B1/7117 ,  H04J13/00

    Abstract: PROBLEM TO BE SOLVED: To provide a lake receiver and a finger managing method improved for providing the merit of path diversity even when the interval of multipath radio waves is shorter than one-chip time. SOLUTION: A lake receiver 112 is provided with plural fingers 122, 124 and 128. Each finger is provided with a demodulator for demodulating the radio waves of multiple path signals and a time tracking circuit for controlling the timewise position of the finger based on the timewise position of the radio wave. Low delay spreading conditions are detected, the positions of two adjacent fingers are controlled and fingers more than two are prevented from being converged around a common timewise position. By maintaining the timing intervals of fingers, even during low delay spreading conditions, the path diversity is effectively utilized by the lake receiver 112 and the performance of the receiver is improved.

    MAXIMUM SIGNAL-TO-INTERFERENCE-AND-NOISE SPREAD SPECTRUM RAKE RECEIVER AND METHOD
    6.
    发明申请
    MAXIMUM SIGNAL-TO-INTERFERENCE-AND-NOISE SPREAD SPECTRUM RAKE RECEIVER AND METHOD 审中-公开
    最大信号与干扰与噪声扩展频谱接收机和方法

    公开(公告)号：WO2004062121A3

    公开(公告)日：2005-01-27

    申请号：PCT/US0341322

    申请日：2003-12-23

    Applicant: MOTOROLA INC

    Inventor： FRANK COLIN D ,  CORKE ROBERT J

    IPC: H04B1/707 ,  H04L27/20

    CPC classification number: H04B1/712

    Abstract: A RAKE receiver (200) incorporates maximum signal-to-interference-and-noise ratio (SINR) combining, implemented adaptively using the least mean-square (LMS) adaptation , recursive least-square adaptation, or multi-stage Weiner adaptation to adjust the weightings for RAKE finger combining. Alternatively, the weighting values for RAKE finger combining may be determined by estimation of the channel mean and the signal correlation matrix from the pilot, and projection of the mean onto the inverse of the correlation matrix. The weightings for these methods result in a combined RAKE receiver output having enhanced, near maximum, SINR. A particular implementation method (400) incorporates the step of LMS adapting RAKE finger weights in order to enhance the combined RAKE receiver output.

    Abstract translation: RAKE接收机（200）结合了最大的信噪比（SINR）组合，使用最小均方（LMS）适应，递归最小二乘适应或多阶段维纳适应来自适应地进行调整 RAKE手指组合的权重。 或者，RAKE手指组合的加权值可以通过估计来自导频的信道均值和信号相关矩阵，以及平均值投影到相关矩阵的倒数上来确定。 这些方法的权重导致组合的RAKE接收机输出具有增强的，接近最大的SINR。 特定的实现方法（400）包括LMS适应RAKE手指权重的步骤，以增强组合的RAKE接收机输出。

    Method and apparatus for reference symbol aided channel estimation
    8.
    发明专利
    Method and apparatus for reference symbol aided channel estimation 未知

    公开(公告)号：GB2440296A

    公开(公告)日：2008-01-23

    申请号：GB0721495

    申请日：2006-03-31

    Applicant: MOTOROLA INC ,  JASPER STEVEN C ,  CORKE ROBERT J ,  FRANK COLIN D ,  MAKHLOUF ISAM R

    Inventor： JASPER STEVEN C ,  CORKE ROBERT J ,  FRANK COLIN D ,  MAKHLOUF ISAM R

    IPC: H04L25/03 ,  H04L27/26

    Abstract: A system that includes a receiver (100) that is configured for: selecting (210) a set of demodulator output samples and a corresponding set of reference symbols; generating (220) a set of raw channel estimates based on the set of demodulator output samples and the corresponding set of reference symbols; subdividing (230) the set of raw channel estimates into a plurality of subsets; assigning and applying (240) a corresponding reference symbol magnitude quantization scheme to each subset; determining (250) a set of filter coefficients that is based on the quantization schemes applied to the subsets of raw channel estimates; and combining (260) the set of raw channel estimates with the set of filter coefficients to generate a channel estimate.

    a direct sequence spread spectrum (ds-cdma) receiver which uses linear equalization with parallel and iterative interference cancellation
    10.
    发明专利
    a direct sequence spread spectrum (ds-cdma) receiver which uses linear equalization with parallel and iterative interference cancellation 未知

    公开(公告)号：GB2381715A

    公开(公告)日：2003-05-07

    申请号：GB0217441

    申请日：2002-07-29

    Applicant: MOTOROLA INC

    Inventor： FRANK COLIN D ,  VISOTSKY EUGENE ,  CHOUDHARY PRASHANT ,  GHOSH AMITAVA

    IPC: H04B1/7105 ,  H04B1/7107 ,  H04L25/03 ,  H04B1/707

    Abstract: The present invention provides linear MMSE equalization with parallel interference cancellation for symbol determination in a forward link of a CDMA communication system which has a plurality of code channels in use. Use of the linear MMSE equalization with parallel interference cancellation of the present invention provides significantly increased performance. The preferred method linearly filters a received signal to form a first filtered signal (410), despreads and demodulates the first filtered signal (415, 420) and provides a plurality of symbol estimates for all corresponding code channels (430). An estimated transmitted signal is generated from the plurality of symbol estimates (435), and with a channel estimate (405), an estimated received signal is generated (440). A residual signal is determined as a difference between the received signal and the estimated received signal, is linearly filtered (445), and then combined with the estimated transmitted signal to form a next, enhanced estimated transmitted signal (450 Figure 4B). This next estimated transmitted signal is despread (455, 460 Figure 4B) and utilized to provide a next plurality of symbol estimates, for a selected code channel of the plurality of channels, for subsequent use in error correction and decoding, and further use by a subscriber (465, 475 Figure 4B).

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