公开(公告)号：IE67263B1

公开(公告)日：1996-03-06

申请号：IE383691

申请日：1986-11-18

Applicant: INTERDIGITAL TECH CORP

Inventor： CRITCHLOW DAVID N ,  AVIS GRAHAM M ,  EARLAM SANDRA J K ,  JOHNSON KARLE J ,  SMETANA BRUCE A ,  WESTLING GREGORY L

IPC: H04J20060101 ,  H04J3/12 ,  H04L20060101 ,  H04L27/00 ,  H04L27/20 ,  H04Q7/00

公开(公告)号：SE9402221L

公开(公告)日：1994-06-23

申请号：SE9402221

申请日：1994-06-23

Applicant: INTERDIGITAL TECH CORP

Inventor： CRITCHLOW DAVID N ,  AVIS GRAHAM M ,  EARLAM SANDRA J K ,  JOHNSON KARLE J ,  SMETANA BRUCE A ,  WESTLING GREGORY L

IPC: H04B7/26 ,  H03D3/00 ,  H03D7/16 ,  H03H17/06 ,  H03L7/095 ,  H04B1/38 ,  H04B1/50 ,  H04B7/005 ,  H04L27/152 ,  H04L27/18 ,  H04L27/22 ,  H04L27/233 ,  H04M1/00 ,  H04M1/253 ,  H04M1/725 ,  H04M11/06 ,  H04Q7/20 ,  H04Q7/38 ,  H04L27/01

Abstract: A subscriber unit for a wireless digital telephone system is disclosed. An equalizer for receiving I and Q samples is disclosed which is in the form. The I and Q samples are complex sample pairs provided at a frequency. The equalizer receives a training signal in the form of complex I and Q sample pairs. A training signal is affected by undesirable characteristics that might be present in the I and Q samples. A comparator compares the actual input training signal with the desired output to obtain a set of weighting coefficients for the equalizer to produce the desired output. A frequency correction circuit provides a corrected frequency signal for the frequency of the sample pairs from the weighting coefficients.

公开(公告)号：SE9402221D0

公开(公告)日：1994-06-23

申请号：SE9402221

申请日：1994-06-23

Applicant: INTERDIGITAL TECH CORP

Inventor： CRITCHLOW DAVID N ,  AVIS GRAHAM M ,  EARLAM SANDRA J K ,  JOHNSON KARLE J ,  SMETANA BRUCE A ,  WESTLING GREGORY L

IPC: H04B7/26 ,  H03D3/00 ,  H03D7/16 ,  H03H17/06 ,  H03L7/095 ,  H04B1/38 ,  H04B1/50 ,  H04B7/005 ,  H04L27/152 ,  H04L27/18 ,  H04L27/22 ,  H04L27/233 ,  H04M1/00 ,  H04M1/253 ,  H04M1/725 ,  H04M11/06 ,  H04Q7/20 ,  H04Q7/38

Abstract: A subscriber unit for a wireless digital telephone system is disclosed. An equalizer for receiving I and Q samples is disclosed which is in the form. The I and Q samples are complex sample pairs provided at a frequency. The equalizer receives a training signal in the form of complex I and Q sample pairs. A training signal is affected by undesirable characteristics that might be present in the I and Q samples. A comparator compares the actual input training signal with the desired output to obtain a set of weighting coefficients for the equalizer to produce the desired output. A frequency correction circuit provides a corrected frequency signal for the frequency of the sample pairs from the weighting coefficients.

公开(公告)号：AU2162488A

公开(公告)日：1988-12-01

申请号：AU2162488

申请日：1988-08-29

Applicant: INTERDIGITAL TECH CORP

Inventor： PANETH ERIC ,  YESHUHUA MOSHE ,  CRITCHLOW DAVID N

IPC: H03D7/00 ,  A63B31/00 ,  H04L27/18 ,  H04L27/20 ,  H04L27/22 ,  H04L27/227 ,  B63C9/16

Abstract: A modulator for a modem, said modulator being adapted to convert a bit stream, wherein each given number of successive bits defines a symbol, into a phase modulated intermediate frequency (IF) signal, the symbols in the modulator section being phase modulated DPSK conversion. The phase modulated symbols are then digitally filtered to provide a filtered signal comprising time shared, digital in-phase and quadrature phase components that, when converted into an analog signal, provides a modulation signal of a frequency that is centered about a predetermined frequency and deviates therefrom in accordance with the value of the phase modulated symbol. The filtered signal, after being converted to an analog signal is then filtered and passed to a mixer for up conversion to an IF signal.

公开(公告)号：SE0400130D0

公开(公告)日：2004-01-23

申请号：SE0400130

申请日：2004-01-23

Applicant: INTERDIGITAL TECH CORP

Inventor： CRITCHLOW DAVID N ,  AVIS GRAHAM M ,  EARLAM SANDRA J K ,  JOHNSON KARLE J ,  SMETANA BRUCE A ,  WESTLING GREGORY L

IPC: H04B7/26 ,  H03D3/00 ,  H03D7/16 ,  H03H17/06 ,  H03L7/095 ,  H04B1/38 ,  H04B1/50 ,  H04B7/005 ,  H04L27/152 ,  H04L27/18 ,  H04L27/22 ,  H04L27/233 ,  H04M1/00 ,  H04M1/253 ,  H04M1/725 ,  H04M11/06 ,  H04Q7/20 ,  H04Q7/38 ,  H04Q7/32 ,  H04M1/03

Abstract: A subscriber unit for a wireless digital telephone system is disclosed. An equalizer for receiving I and Q samples is disclosed which is in the form. The I and Q samples are complex sample pairs provided at a frequency. The equalizer receives a training signal in the form of complex I and Q sample pairs. A training signal is affected by undesirable characteristics that might be present in the I and Q samples. A comparator compares the actual input training signal with the desired output to obtain a set of weighting coefficients for the equalizer to produce the desired output. A frequency correction circuit provides a corrected frequency signal for the frequency of the sample pairs from the weighting coefficients.

公开(公告)号：SE0400130A

公开(公告)日：2004-01-23

申请号：SE0400130

申请日：2004-01-23

Applicant: INTERDIGITAL TECH CORP

Inventor： CRITCHLOW DAVID N ,  AVIS GRAHAM M ,  EARLAM SANDRA J K ,  JOHNSON KARLE J ,  SMETANA BRUCE A ,  WESTLING GREGORY L

IPC: H04B7/26 ,  H03D3/00 ,  H03D7/16 ,  H03H17/06 ,  H03L7/095 ,  H04B1/38 ,  H04B1/50 ,  H04B7/005 ,  H04L27/152 ,  H04L27/18 ,  H04L27/22 ,  H04L27/233 ,  H04M1/00 ,  H04M1/253 ,  H04M1/725 ,  H04M11/06 ,  H04Q7/20 ,  H04Q7/38 ,  H04Q7/32 ,  H04M1/03

CPC classification number: H04M1/72502 ,  H03D3/006 ,  H03D3/007 ,  H03D7/161 ,  H03D7/165 ,  H03D2200/005 ,  H03D2200/0052 ,  H03D2200/0058 ,  H03D2200/0062 ,  H03D2200/0082 ,  H03H17/0657 ,  H03L7/095 ,  H04B1/50 ,  H04L27/1525 ,  H04L27/2338

公开(公告)号：DK174787B1

公开(公告)日：2003-11-10

申请号：DK427085

申请日：1985-09-20

Applicant: INTERDIGITAL TECH CORP

Inventor： PANETH ERICH ,  CRITCHLOW DAVID N ,  YEHUSHUA MOSHE

IPC: H03D7/00 ,  A63B31/00 ,  H04L27/18 ,  H04L27/20 ,  H04L27/22 ,  H04L27/227

Abstract: A modulator for a modem, said modulator being adapted to convert a bit stream, wherein each given number of successive bits defines a symbol, into a phase modulated intermediate frequency (IF) signal, the symbols in the modulator section being phase modulated DPSK conversion. The phase modulated symbols are then digitally filtered to provide a filtered signal comprising time shared, digital in-phase and quadrature phase components that, when converted into an analog signal, provides a modulation signal of a frequency that is centered about a predetermined frequency and deviates therefrom in accordance with the value of the phase modulated symbol. The filtered signal, after being converted to an analog signal is then filtered and passed to a mixer for up conversion to an IF signal.

公开(公告)号：DE3644066C2

公开(公告)日：2000-03-02

申请号：DE3644066

申请日：1986-12-22

Applicant: INTERDIGITAL TECH CORP

Inventor： CRITCHLOW DAVID N ,  AVIS GRAHAM M ,  EARLAM SANDRA J K ,  JOHNSON KARLE J ,  SMETANA BRUCE A ,  WESTLING GREGORY L

IPC: H03D3/00 ,  H03D7/16 ,  H03H17/06 ,  H04M1/725 ,  H04B1/40 ,  H04L27/18

公开(公告)号：DK199801517A

公开(公告)日：1998-11-19

申请号：DKPA199801517

申请日：1998-11-19

Applicant: INTERDIGITAL TECH CORP

Inventor： CRITCHLOW DAVID N ,  AVIS GRAHAM M ,  EARLAM SANDRA J K ,  JOHNSON KARLE J ,  SMETANA BRUCE A ,  WESTLING GREGORY L

IPC: H04B1/38 ,  H04B7/26 ,  H04M3/42 ,  H04W88/02

公开(公告)号：NO179929C

公开(公告)日：1997-01-08

申请号：NO854602

申请日：1985-11-18

Applicant: INTERDIGITAL TECH CORP ,  INTERDIGITAL COMMUNICATIONS CO ,  INT MOBILE MACHINES

Inventor： PANETH ERIC ,  CRITCHLOW DAVID N ,  YEHUSHUA MOSHE

IPC: H03D7/00 ,  A63B31/00 ,  H04L27/18 ,  H04L27/20 ,  H04L27/22 ,  H04L27/227

Abstract: A modulator for a modem, said modulator being adapted to convert a bit stream, wherein each given number of successive bits defines a symbol, into a phase modulated intermediate frequency (IF) signal, the symbols in the modulator section being phase modulated DPSK conversion. The phase modulated symbols are then digitally filtered to provide a filtered signal comprising time shared, digital in-phase and quadrature phase components that, when converted into an analog signal, provides a modulation signal of a frequency that is centered about a predetermined frequency and deviates therefrom in accordance with the value of the phase modulated symbol. The filtered signal, after being converted to an analog signal is then filtered and passed to a mixer for up conversion to an IF signal.