公开(公告)号：AU570152B1

公开(公告)日：1988-03-03

申请号：AU6429786

申请日：1986-10-21

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 ,  H03M7/36 ,  H03M1/08 ,  H04L5/22 ,  H03B21/02 ,  H03D7/00

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：SE523252C2

公开(公告)日：2004-04-06

申请号：SE9902040

申请日：1999-06-03

Applicant: INTERDIGITAL TECH CORP

Inventor： CRITCHCLOW 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：DE3812611C2

公开(公告)日：1996-09-12

申请号：DE3812611

申请日：1988-04-15

Applicant: INTERDIGITAL TECH CORP

Inventor： AVIS GRAHAM M ,  COLLINS TERRANCE STEPHEN ,  SCHROEDER MARTIN KEITH ,  KIERNAN BRIAN GREGORY ,  MECHLING JONATHAN WILLIS ,  FLETCHER THOMAS E ,  AVIS WENDELINE R ,  SAFFEE GREGORY T ,  JOHNSON KARLE J

IPC: H04B7/00 ,  H04B7/26 ,  H04L12/56 ,  H04M20060101 ,  H04W24/00 ,  H04W28/06 ,  H04W72/04 ,  H04W74/04 ,  H04W84/08 ,  H04W84/14 ,  H04W88/08 ,  H04W92/02 ,  H04W92/12 ,  H04J3/00 ,  H04L12/00 ,  H04Q7/30

Abstract: The base station includes a communication circuit for enabling simultaneous communications between a number of ports and a number of the subscriber stations over a given communication channel having multiple sequentially repetitive time slots. An exchange is included to connect the communication circuit to the external communication network ports. A remote-connection process is coupled to the communication circuit by the exchange and by a base-station control channel occupying a selected one of the time slots for monitoring the status of the other time slots. The connection processor causes the communication circuit and the exchange to complete a connection between a given communication network port and a given subscriber station over a time slot assigned in response to the monitored status in accordance with a predetermined assignment routine.

公开(公告)号：IE67265B1

公开(公告)日：1996-03-06

申请号：IE383891

申请日：1986-11-18

Applicant: INTERDIGITAL TECH CORP

Inventor： CRTICHLOW 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：IE67264B1

公开(公告)日：1996-03-06

申请号：IE383791

申请日：1986-11-18

Applicant: INTERDIGITAL TECH CORP

Inventor： CRITCHLOW DAVID N ,  AVIS GRAHAM M ,  EARLEM 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：CA2022128C

公开(公告)日：1995-02-07

申请号：CA2022128

申请日：1990-07-27

Applicant: INTERDIGITAL TECH CORP

Inventor： CRITCHLOW DAVID N ,  YEHUSHUA MOSHE ,  AVIS GRAHAM M ,  HEIMBIGNER WADE L ,  JOHNSON KARLE J ,  WILEY GEORGE A

IPC: H04M1/00 ,  H03B28/00 ,  H03C3/00 ,  H03D3/00 ,  H04B1/40 ,  H04B3/00 ,  H04B7/00 ,  H04J3/02 ,  H04L25/03 ,  H04L27/00 ,  H04L27/18 ,  H04L27/20 ,  H04W84/16

Abstract: A subscriber unit for wireless communication with a base station in a wireless subscriber communication system includes a FIR chip, a DIF (digital intermediate frequency) chip, a single processor chip and a radio. The processorchip transcodes a digital voice input signal to provide digital input symbols; demodulates an output signal received from the base station to provide digital output symbols; and synthesizes a digital voice output signal from the digital output symbols. The FIR chip FIR filters the digital input symbols and generatestiming signals for timing the transcoding and synthesizing operations in the processor chip. The DIF chip digitally synthesizes a digital intermediate frequency signal by direct digital synthesis (DDS) and modulates the digital intermediate frequency signal with the filtered input symbols to provide a modulated intermediate frequency input signal. The radio further processes the modulated input signal for transmission to the base station.

公开(公告)号：NO175559C

公开(公告)日：1994-10-26

申请号：NO881468

申请日：1988-04-06

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

Inventor： AVIS GRAHAM M ,  COLLINS TERRANCE STEPHEN ,  SCHROEDER MARTIN KEITH ,  KIERNAN BRIAN GREGORY ,  MECHLING JONATHAN WILLIS ,  FLETCHER THOMAS E ,  AVIS WENDELINE R ,  SAFFEE GREGORY T ,  JOHNSON KARLE J

IPC: H04B7/00 ,  H04B7/26 ,  H04L12/56 ,  H04M20060101 ,  H04W24/00 ,  H04W28/06 ,  H04W72/04 ,  H04W74/04 ,  H04W84/08 ,  H04W84/14 ,  H04W88/08 ,  H04W92/02 ,  H04W92/12 ,  H04Q7/04

Abstract: The base station includes a communication circuit for enabling simultaneous communications between a number of ports and a number of the subscriber stations over a given communication channel having multiple sequentially repetitive time slots. An exchange is included to connect the communication circuit to the external communication network ports. A remote-connection process is coupled to the communication circuit by the exchange and by a base-station control channel occupying a selected one of the time slots for monitoring the status of the other time slots. The connection processor causes the communication circuit and the exchange to complete a connection between a given communication network port and a given subscriber station over a time slot assigned in response to the monitored status in accordance with a predetermined assignment routine.