公开(公告)号：HK1008131A1

公开(公告)日：1999-04-30

申请号：HK98106337

申请日：1998-06-24

Applicant: GEN INSTRUMENT CORP

Inventor： PAIK WOO H ,  LERY SCOTT A ,  TOM ADAM S

IPC: H04B3/06 ,  H04L25/03 ,  H04L27/38 ,  H04L

Abstract: A method and apparatus are provided for adaptively equalizing data signals in a communications receiver. An unequalized data signal is demodulated. The demodulated data signal is filtered in an adaptive equalizer (60) that initially updates adaptive filter coefficients using error signals derived from a first algorithm. A carrier lock signal is generated (62, 78) when a phase error of a filtered signal output from the adaptive equalizer reaches a threshold value. The adaptive filter coefficients are updated (74) using error signals derived from a second algorithm instead of the first algorithm in response to the carrier lock signal (72). The first algorithm is a self-recovering equalization algorithm such as the Constant Modulus Algorithm. The second algorithm can be a decision directed algorithm. Carrier phase is recovered without the use of a phase rotator or phase de-rotator, by locating the adaptive equalizer inside of the carrier recovery loop (56). The invention is particularly adapted for use in the recovery of multilevel amplitude modulated data, such as QAM data.

公开(公告)号：CA2073944A1

公开(公告)日：1993-01-27

申请号：CA2073944

申请日：1992-07-15

Applicant: GEN INSTRUMENT CORP

Inventor： PAIK WOO H ,  LERY SCOTT A ,  TOM ADAM S

IPC: H04B3/06 ,  H04L25/03 ,  H04L27/38 ,  H04B1/10

Abstract: A method and apparatus are provided for adaptively equalizing data signals in a communications receiver. An unequalized data signal is demodulated. The demodulated data signal is filtered in an adaptive equalizer (60) that initially updates adaptive filter coefficients using error signals derived from a first algorithm. A carrier lock signal is generated (62, 78) when a phase error of a filtered signal output from the adaptive equalizer reaches a threshold value. The adaptive filter coefficients are updated (74) using error signals derived from a second algorithm instead of the first algorithm in response to the carrier lock signal (72). The first algorithm is a self-recovering equalization algorithm such as the Constant Modulus Algorithm. The second algorithm can be a decision directed algorithm. Carrier phase is recovered without the use of a phase rotator or phase de-rotator, by locating the adaptive equalizer inside of the carrier recovery loop (56). The invention is particularly adapted for use in the recovery of multilevel amplitude modulated data, such as QAM data.

公开(公告)号：CA2073944C

公开(公告)日：2000-09-19

申请号：CA2073944

申请日：1992-07-15

Applicant: GEN INSTRUMENT CORP

Inventor： PAIK WOO H ,  LERY SCOTT A ,  TOM ADAM S

IPC: H04B3/06 ,  H04L25/03 ,  H04L27/38 ,  H04B1/10

Abstract: A method and apparatus are provided for adaptively equalizing data signals in a communications receiver. An unequalized data signal is demodulated. The demodulated data signal is filtered in an adaptive equalizer that initially updates adaptive filter coefficients using error signals derived from a first algorithm. A carrier lock signal is generated when a phase error of a filtered signal output from the adaptive equalizer reaches a threshold value. The adaptive filter coefficients are updated using error signals derived from a second algorithm instead. of the first algorithm in response to the carrier lock signal. The first algorithm is a self-recovering equalization algorithm such as the Constant Modulus Algorithm. The second algorithm can be a decision directed algorithm. Carrier phase is recovered without the use of a phase rotator or phase derotator, by locating the adaptive equalizer inside of the carrier recovery loop. The invention is particularly adapted for use in the recovery of multilevel amplitude modulated data, such as QAM data.

公开(公告)号：DE69219412T2

公开(公告)日：1997-11-27

申请号：DE69219412

申请日：1992-07-18

Applicant: GEN INSTRUMENT CORP

Inventor： PAIK WOO H ,  LERY SCOTT A ,  TOM ADAM S

IPC: H04B3/06 ,  H04L25/03 ,  H04L27/38

Abstract: A method and apparatus are provided for adaptively equalizing data signals in a communications receiver. An unequalized data signal is demodulated. The demodulated data signal is filtered in an adaptive equalizer (60) that initially updates adaptive filter coefficients using error signals derived from a first algorithm. A carrier lock signal is generated (62, 78) when a phase error of a filtered signal output from the adaptive equalizer reaches a threshold value. The adaptive filter coefficients are updated (74) using error signals derived from a second algorithm instead of the first algorithm in response to the carrier lock signal (72). The first algorithm is a self-recovering equalization algorithm such as the Constant Modulus Algorithm. The second algorithm can be a decision directed algorithm. Carrier phase is recovered without the use of a phase rotator or phase de-rotator, by locating the adaptive equalizer inside of the carrier recovery loop (56). The invention is particularly adapted for use in the recovery of multilevel amplitude modulated data, such as QAM data.

公开(公告)号：DK0524559T3

公开(公告)日：1997-12-01

申请号：DK92112305

申请日：1992-07-18

Applicant: GEN INSTRUMENT CORP

Inventor： PAIK WOO H ,  LERY SCOTT A ,  TOM ADAM S

IPC: H04B3/06 ,  H04L25/03 ,  H04L27/38

Abstract: A method and apparatus are provided for adaptively equalizing data signals in a communications receiver. An unequalized data signal is demodulated. The demodulated data signal is filtered in an adaptive equalizer (60) that initially updates adaptive filter coefficients using error signals derived from a first algorithm. A carrier lock signal is generated (62, 78) when a phase error of a filtered signal output from the adaptive equalizer reaches a threshold value. The adaptive filter coefficients are updated (74) using error signals derived from a second algorithm instead of the first algorithm in response to the carrier lock signal (72). The first algorithm is a self-recovering equalization algorithm such as the Constant Modulus Algorithm. The second algorithm can be a decision directed algorithm. Carrier phase is recovered without the use of a phase rotator or phase de-rotator, by locating the adaptive equalizer inside of the carrier recovery loop (56). The invention is particularly adapted for use in the recovery of multilevel amplitude modulated data, such as QAM data.

公开(公告)号：AT152563T

公开(公告)日：1997-05-15

申请号：AT92112305

申请日：1992-07-18

Applicant: GEN INSTRUMENT CORP

Inventor： PAIK WOO H ,  LERY SCOTT A ,  TOM ADAM S

IPC: H04B3/06 ,  H04L25/03 ,  H04L27/38

Abstract: A method and apparatus are provided for adaptively equalizing data signals in a communications receiver. An unequalized data signal is demodulated. The demodulated data signal is filtered in an adaptive equalizer (60) that initially updates adaptive filter coefficients using error signals derived from a first algorithm. A carrier lock signal is generated (62, 78) when a phase error of a filtered signal output from the adaptive equalizer reaches a threshold value. The adaptive filter coefficients are updated (74) using error signals derived from a second algorithm instead of the first algorithm in response to the carrier lock signal (72). The first algorithm is a self-recovering equalization algorithm such as the Constant Modulus Algorithm. The second algorithm can be a decision directed algorithm. Carrier phase is recovered without the use of a phase rotator or phase de-rotator, by locating the adaptive equalizer inside of the carrier recovery loop (56). The invention is particularly adapted for use in the recovery of multilevel amplitude modulated data, such as QAM data.

公开(公告)号：NO922856A

公开(公告)日：1993-01-27

申请号：NO922856

申请日：1992-07-17

Applicant: GEN INSTRUMENT CORP

Inventor： PAIK WOO H ,  LERY SCOTT A ,  TOM ADAM S

IPC: H04B3/06 ,  H04L25/03 ,  H04L27/38 ,  H03H21/00 ,  H04B1/10

CPC classification number: H04L25/0314 ,  H04L27/3827

公开(公告)号：NO303900B1

公开(公告)日：1998-09-14

申请号：NO922856

申请日：1992-07-17

Applicant: GEN INSTRUMENT CORP

Inventor： PAIK WOO H ,  LERY SCOTT A ,  TOM ADAM S

IPC: H04L25/03 ,  H04B3/06 ,  H04L27/38

Abstract: A method and apparatus are provided for adaptively equalizing data signals in a communications receiver. An unequalized data signal is demodulated. The demodulated data signal is filtered in an adaptive equalizer (60) that initially updates adaptive filter coefficients using error signals derived from a first algorithm. A carrier lock signal is generated (62, 78) when a phase error of a filtered signal output from the adaptive equalizer reaches a threshold value. The adaptive filter coefficients are updated (74) using error signals derived from a second algorithm instead of the first algorithm in response to the carrier lock signal (72). The first algorithm is a self-recovering equalization algorithm such as the Constant Modulus Algorithm. The second algorithm can be a decision directed algorithm. Carrier phase is recovered without the use of a phase rotator or phase de-rotator, by locating the adaptive equalizer inside of the carrier recovery loop (56). The invention is particularly adapted for use in the recovery of multilevel amplitude modulated data, such as QAM data.

公开(公告)号：NO922856D0

公开(公告)日：1992-07-17

申请号：NO922856

申请日：1992-07-17

Applicant: GEN INSTRUMENT CORP

Inventor： PAIK WOO H ,  LERY SCOTT A ,  TOM ADAM S

IPC: H04L25/03 ,  H04B3/06 ,  H04L27/38 ,  H04B

Abstract: A method and apparatus are provided for adaptively equalizing data signals in a communications receiver. An unequalized data signal is demodulated. The demodulated data signal is filtered in an adaptive equalizer (60) that initially updates adaptive filter coefficients using error signals derived from a first algorithm. A carrier lock signal is generated (62, 78) when a phase error of a filtered signal output from the adaptive equalizer reaches a threshold value. The adaptive filter coefficients are updated (74) using error signals derived from a second algorithm instead of the first algorithm in response to the carrier lock signal (72). The first algorithm is a self-recovering equalization algorithm such as the Constant Modulus Algorithm. The second algorithm can be a decision directed algorithm. Carrier phase is recovered without the use of a phase rotator or phase de-rotator, by locating the adaptive equalizer inside of the carrier recovery loop (56). The invention is particularly adapted for use in the recovery of multilevel amplitude modulated data, such as QAM data.

公开(公告)号：ES2100979T3

公开(公告)日：1997-07-01

申请号：ES92112305

申请日：1992-07-18

Applicant: GEN INSTRUMENT CORP

Inventor： PAIK WOO H ,  LERY SCOTT A ,  TOM ADAM S

IPC: H04B3/06 ,  H04L25/03 ,  H04L27/38

Abstract: A method and apparatus are provided for adaptively equalizing data signals in a communications receiver. An unequalized data signal is demodulated. The demodulated data signal is filtered in an adaptive equalizer (60) that initially updates adaptive filter coefficients using error signals derived from a first algorithm. A carrier lock signal is generated (62, 78) when a phase error of a filtered signal output from the adaptive equalizer reaches a threshold value. The adaptive filter coefficients are updated (74) using error signals derived from a second algorithm instead of the first algorithm in response to the carrier lock signal (72). The first algorithm is a self-recovering equalization algorithm such as the Constant Modulus Algorithm. The second algorithm can be a decision directed algorithm. Carrier phase is recovered without the use of a phase rotator or phase de-rotator, by locating the adaptive equalizer inside of the carrier recovery loop (56). The invention is particularly adapted for use in the recovery of multilevel amplitude modulated data, such as QAM data.