公开(公告)号：EP0587641B1

公开(公告)日：1998-08-19

申请号：EP92911134.2

申请日：1992-04-29

Applicant: MOTOROLA, INC.

Inventor： LING, Fuyun ,  LABEDZ, Gerald, P.

IPC: H04J3/06 ,  H04B7/26 ,  H04L25/03

CPC classification number: H04L27/2332 ,  H04L25/0212 ,  H04L2027/003 ,  H04L2027/0057 ,  H04L2027/0067 ,  H04L2027/0095

公开(公告)号：EP0771435A2

公开(公告)日：1997-05-07

申请号：EP96924247.0

申请日：1996-01-11

Applicant: MOTOROLA, INC.

Inventor： BRUCKERT, Eugene ,  LING, Fuyun ,  SEXTON, Thomas, Aloysius

IPC: C09D5 ,  C09D7 ,  G03C1 ,  G03C7 ,  G03C11 ,  G11B5 ,  H04B1

CPC classification number: G03C11/02 ,  G11B5/633

Abstract: A method and apparatus for improved offset frequency estimation includes in a first embodiment a receiver (100) for coherent reception of a signal having known reference information, the receiver including an extractor (106) for extracting the reference information (107) from the signal, and an offset frequency estimator (110). The offset frequency estimator (110) includes a filter (121) for filtering the reference information and outputting a filtered reference sequence; a correlator (122, 124) for correlating the filtered reference sequence against a predetermined reference signal to form correlation values; and a peak detector (126) for determining an offset frequency estimate (131) from the correlation values. Other embodiments are also shown.

公开(公告)号：EP0643889B1

公开(公告)日：2002-06-05

申请号：EP94913263.3

申请日：1994-02-16

Applicant: MOTOROLA, INC.

Inventor： LING, Fuyun

IPC: H04K1/00 ,  H04B7/08 ,  H04B1/69

CPC classification number: H04B7/0845 ,  H03M13/00 ,  H04B1/707 ,  H04L25/0228

公开(公告)号：EP0771435B1

公开(公告)日：2001-06-27

申请号：EP96924247.8

申请日：1996-01-11

Applicant: MOTOROLA, INC.

Inventor： BRUCKERT, Eugene ,  LING, Fuyun ,  SEXTON, Thomas, Aloysius

IPC: H04B7/26

CPC classification number: G03C11/02 ,  G11B5/633

Abstract: A method and apparatus for improved offset frequency estimation includes in a first embodiment a receiver (100) for coherent reception of a signal having known reference information, the receiver including an extractor (106) for extracting the reference information (107) from the signal, and an offset frequency estimator (110). The offset frequency estimator (110) includes a filter (121) for filtering the reference information and outputting a filtered reference sequence; a correlator (122, 124) for correlating the filtered reference sequence against a predetermined reference signal to form correlation values; and a peak detector (126) for determining an offset frequency estimate (131) from the correlation values. Other embodiments are also shown.

公开(公告)号：EP1051809A1

公开(公告)日：2000-11-15

申请号：EP99903365.7

申请日：1999-01-26

Applicant: MOTOROLA, INC.

Inventor： LING, Fuyun

IPC: H04B1/16

CPC classification number: H03G3/3078 ,  H04B1/707 ,  H04B1/7115

Abstract: A receiver (300) for use in a wideband code division multiple access (CDMA) wireless communication system is disclosed. The system conveys at least first and second CDMA signals by carriers centered at first and second carrier frequencies. The receiver includes a radio frequency (RF) receiver front end (204) for receiving the first and second CDMA signals to yield a set of in-phase (I) and quaternary phase (Q) components. First and second filters (222, 224) responsive to mixers (210, 214) filter the set of in-phase (I) and quaternary phase (Q) components to produce a filtered first and second set of in-phase (I) and quaternary phase (Q) components. First and second digital automatic gain controllers (400) adjust the filtered first and second set of in-phase (I) and quaternary phase (Q) components to produce a gain adjusted first and second set of in-phase (I) and quaternary phase (Q) components for use in subsequent despreading.

公开(公告)号：EP0913066A2

公开(公告)日：1999-05-06

申请号：EP97920010.0

申请日：1997-03-27

Applicant: MOTOROLA, INC.

Inventor： TONG, Leon ,  LING, Fuyun

IPC: G01S5 ,  G01S19 ,  H04W64

CPC classification number: H04W64/00 ,  G01S5/14

Abstract: The method includes receiving (404) by a first base station (212) a signal (215) transmitted from the mobile station (216); demodulating (406) the signal by the first base station (212) to form a demodulated signal; remodulating (408) at least a portion of the demodulated signal to form a reference signal; receiving (412) by the first base station (212) and a second base station (210, 214) a retransmitted signal (217); comparing (414, 416), by the first base station (212), the retransmitted signal (217) with the reference signal to determine a first delay; comparing (414, 416), by the second base station (210, 214), the retransmitted second signal (217) with the reference signal to determine a second delay; and based on the first and second delays, determining (420) a location of the mobile station (216).

公开(公告)号：EP0732022A1

公开(公告)日：1996-09-18

申请号：EP95930789.0

申请日：1995-07-31

Applicant: MOTOROLA, INC.

Inventor： LING, Fuyun ,  SEXTON, Thomas, A. ,  BRUCKERT, Gene

IPC: H04L27 ,  H04B1 ,  H04J3 ,  H04L7 ,  H04L25

CPC classification number: H04B1/7087 ,  H04B1/707 ,  H04B1/7117 ,  H04B2201/70703 ,  H04B2201/70705 ,  H04J3/0605 ,  H04L25/0202 ,  H04L27/2276

Abstract: A method and apparatus is provided for facilitating coherent communication reception. A received reference symbol coded spread-spectrum communication signal is despread with a spreading code to derive a stream of reference samples (152) and a stream of data samples (158). The channel response is estimated by utilizing the stream of reference samples (152). An offset frequency detector (443) determines an offset to be applied to the received signal via a frequency locked loop (456), while a timing control (176) compensates for slow timing drift and fast fading based on power estimates derived from the stream of reference samples (152) and/or the stream of data samples (158). A rate estimator determines the rate at which the information was encoded, and the rate information is used to optimize the timing control (176), frequency offset detector (443) and channel estimator (154). Thus an improved detection of estimated data symbols from the stream of received data samples (158) is provided.

公开(公告)号：EP0643889A1

公开(公告)日：1995-03-22

申请号：EP94913263.0

申请日：1994-02-16

Applicant: MOTOROLA, INC.

Inventor： LING, Fuyun

IPC: H04K1 ,  H03M13 ,  H04B1 ,  H04B7 ,  H04L25

CPC classification number: H04B7/0845 ,  H03M13/00 ,  H04B1/707 ,  H04L25/0228

Abstract: A method and apparatus is provided for encoding and decoding to facilitate coherent communication. In encoding, reference symbols are inserted into a stream of input data symbols (110) to form a reference coded stream of input data symbols (114). Subsequently, the reference coded stream of input data symbols are prepared for transmission over a communication channel by spreading the reference coded stream of input data symbols with a spreading code prior to transmission over the communication channel. In decoding, a received communication signal (120) is despread with a spreading code to derive a stream of reference samples (132) and a stream of data samples (138). The channel response is estimated by utilizing the stream of reference samples (132). Finally, an estimated data symbol is detected from the stream of data samples (138) by utilizing the estimated channel response.