公开(公告)号：CA2153682C

公开(公告)日：1999-03-23

申请号：CA2153682

申请日：1994-10-25

Applicant: MOTOROLA INC

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

IPC: H04L27/22 ,  H04B1/707 ,  H04L27/227 ,  H04L27/00

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 analogto-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：CA2153682A1

公开(公告)日：1995-06-08

申请号：CA2153682

申请日：1994-10-25

Applicant: MOTOROLA INC

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

IPC: H04L27/22 ,  H04B1/707 ,  H04L27/227 ,  H04L27/00

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：SE9502703D0

公开(公告)日：1995-07-27

申请号：SE9502703

申请日：1995-07-27

Applicant: MOTOROLA INC

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

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

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：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：FI953609A0

公开(公告)日：1995-07-28

申请号：FI953609

申请日：1995-07-28

Applicant: MOTOROLA INC

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

IPC: H04L27/22 ,  H04B1/707 ,  H04L27/227 ,  H04L

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：FI953609A

公开(公告)日：1995-07-28

申请号：FI953609

申请日：1995-07-28

Applicant: MOTOROLA INC

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

IPC: H04L27/22 ,  H04B1/707 ,  H04L27/227 ,  H04L

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.