中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

26 records (took 0.028 seconds)

    1.
    发明专利
    未知

    公开(公告)号：DE60027324T2

    公开(公告)日：2006-08-31

    申请号：DE60027324

    申请日：2000-02-04

    Applicant: INTERDIGITAL TECH CORP

    Inventor： SEZGIN NADIR ,  DICK G

    IPC: H04B1/7097 ,  H04B1/707 ,  H04B1/7115 ,  H04Q7/38

    Abstract: A method is disclosed for receiving transmitted signals in the presence of CW interference in a communication system that determines the presence of a code in a received signal by comparing with a detector threshold calculations made in accordance with a sample of a received signal. Such systems include but are not limited to those incorporating a Sequential Probability Ratio Test. The method includes obtaining a first input power value of the received signal at a first sample time and obtaining a second input power value of the received signal at a second sample time. The first and second power values are compared in order to provide an input sample comparison and the forgoing steps are repeated in order to provide a plurality of input sample comparisons. The detector threshold is adjusted in accordance with the plurality of sample comparisons. The CW signal can be strongly correlated with a short code used for the acquisition purposes. Therefore in the CDMA systems if the received signal contains a CW signal, then the strong correlation between the CW signal and the short code used for acquisition may result in a false alarm. To prevent this, the following algorithm is suggested to be used for the cancellation of CW, if there is a CW signal present in the received CDMA signal.

    2.
    发明专利
    未知

    公开(公告)号：DE69921693D1

    公开(公告)日：2004-12-09

    申请号：DE69921693

    申请日：1999-12-07

    Applicant: INTERDIGITAL TECH CORP

    Inventor： OZLUTURK M ,  DICK G ,  KAZAKEVICH LEONID

    IPC: H03C3/02 ,  H03C5/00 ,  H04L27/00 ,  H04L27/01 ,  H04L27/18 ,  H04L27/22

    Abstract: The present invention involves a system (61) for balancing a signal having I and Q components (63I, 63Q), characterized in that the system comprises: means for cross correlating (75) the I and Q components (63I, 63Q) to produce a cross correlation product (77); means for adjusting (93I, 93Q) a gain of each I and Q component (63I, 63Q) in accordance with said cross correlation product (77); and means for adding (69I, 69Q) the I component (63I) with an adjusted Q component (95I), and the Q component (63Q) with an adjusted I component (95Q) to produce a phase-balanced signal (73I, 73Q).

    3.
    发明专利
    未知

    公开(公告)号：DE69915689D1

    公开(公告)日：2004-04-22

    申请号：DE69915689

    申请日：1999-12-14

    Applicant: INTERDIGITAL TECH CORP

    Inventor： DICK G ,  DENNEAN CHARLES ,  ZEIRA ELDAD ,  PAN JUNG-LIN ,  SHIN SUNG-HYUK ,  ZEIRA ARIELA

    IPC: H03M7/30 ,  H04B1/707 ,  H04J13/00 ,  H04J13/10 ,  H04W74/08

    Abstract: The present invention relates to a detector that detects a transmitted digital signature using the energy output from a matched filter. The energies are tabulated according to an anticipated signature pattern for variable transmission distances. The tabulation accounts for expected round trip transmission delays and allows processing of the accumulated symbols to derive a correct signature whether coherent or signature coding is used and multiple Doppler channels are present.

    4.
    发明专利
    未知

    公开(公告)号：DE60304689T2

    公开(公告)日：2007-04-12

    申请号：DE60304689

    申请日：2003-02-04

    Applicant: INTERDIGITAL TECH CORP

    Inventor： DICK G ,  MILLER M

    IPC: H04B7/00 ,  H04L7/00 ,  H04B7/212 ,  H04B7/26 ,  H04L12/24 ,  H04Q7/36

    Abstract: Method and apparatus for synchronizing base stations employing an independent synchronizing source or identifying a base station as a master source. An RNC (C-RNC) or a base station may designate one base station or a UE to acquire measurements derived from base stations to achieve synchronization. Synchronization activities may be regularly scheduled or may be undertaken when periodic measurements indicate that a drift value exceeds a given threshold.

    5.
    发明专利
    未知

    公开(公告)号：DE60027324D1

    公开(公告)日：2006-05-24

    申请号：DE60027324

    申请日：2000-02-04

    Applicant: INTERDIGITAL TECH CORP

    Inventor： SEZGIN NADIR ,  DICK G

    IPC: H04B1/7097 ,  H04B1/707 ,  H04B1/7115 ,  H04Q7/38

    Abstract: A method is disclosed for receiving transmitted signals in the presence of CW interference in a communication system that determines the presence of a code in a received signal by comparing with a detector threshold calculations made in accordance with a sample of a received signal. Such systems include but are not limited to those incorporating a Sequential Probability Ratio Test. The method includes obtaining a first input power value of the received signal at a first sample time and obtaining a second input power value of the received signal at a second sample time. The first and second power values are compared in order to provide an input sample comparison and the forgoing steps are repeated in order to provide a plurality of input sample comparisons. The detector threshold is adjusted in accordance with the plurality of sample comparisons. The CW signal can be strongly correlated with a short code used for the acquisition purposes. Therefore in the CDMA systems if the received signal contains a CW signal, then the strong correlation between the CW signal and the short code used for acquisition may result in a false alarm. To prevent this, the following algorithm is suggested to be used for the cancellation of CW, if there is a CW signal present in the received CDMA signal.

    6.
    发明专利
    未知

    公开(公告)号：DE69915689T2

    公开(公告)日：2005-03-24

    申请号：DE69915689

    申请日：1999-12-14

    Applicant: INTERDIGITAL TECH CORP

    Inventor： DICK G ,  DENNEAN CHARLES ,  ZEIRA ELDAD ,  PAN JUNG-LIN ,  SHIN SUNG-HYUK ,  ZEIRA ARIELA

    IPC: H03M7/30 ,  H04B1/707 ,  H04J13/00 ,  H04J13/10 ,  H04W74/08

    Abstract: The present invention relates to a detector that detects a transmitted digital signature using the energy output from a matched filter. The energies are tabulated according to an anticipated signature pattern for variable transmission distances. The tabulation accounts for expected round trip transmission delays and allows processing of the accumulated symbols to derive a correct signature whether coherent or signature coding is used and multiple Doppler channels are present.

    8.
    发明专利
    未知

    公开(公告)号：DE1183892T1

    公开(公告)日：2002-11-28

    申请号：DE00932658

    申请日：2000-05-19

    Applicant: INTERDIGITAL TECH CORP

    Inventor： DICK G ,  ZEIRA ELDAD

    IPC: H04J13/00 ,  H04W72/04 ,  H04W74/08 ,  H04Q7/38

    Abstract: The present invention provides a method for sending data in a spread spectrum code division multiple access communication system having a common packet channel using a predetermined set of codes and a base station thereof. The common packet channel has a plurality of access opportunities, each defined by a time slot (30-34) and signature (36-40). The method of the present invention comprises the steps of receiving a signature in the common packet channel, selecting a code out of a plurality of codes associated with the common packet channel, transmitting a combined collision signal and channel identifier, and communicating data using the selected code. According to the present invention, the channel identifier indicates the selected code and the channel identifier is associated with the received signature.

Patent Agency Ranking