公开(公告)号：EP1188260B1

公开(公告)日：2004-07-14

申请号：EP00937742.5

申请日：2000-05-24

Applicant: INTERDIGITAL TECHNOLOGY CORPORATION

Inventor： SEZGIN, Nadir ,  OZLUTURK, Fatih

IPC: H04B7/26

CPC classification number: H04B1/7083 ,  H04B1/70735 ,  H04B1/70752 ,  H04B2201/70702 ,  H04W28/26 ,  H04W74/04 ,  H04W88/08

公开(公告)号：EP1252721B1

公开(公告)日：2006-04-12

申请号：EP00907179.6

申请日：2000-02-04

Applicant: INTERDIGITAL TECHNOLOGY CORPORATION

Inventor： SEZGIN, Nadir ,  DICK, Stephen, G.

IPC: H04B1/707

CPC classification number: H04B1/70755 ,  H04B1/7097

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.

公开(公告)号：EP1252721A1

公开(公告)日：2002-10-30

申请号：EP00907179.6

申请日：2000-02-04

Applicant: INTERDIGITAL TECHNOLOGY CORPORATION

Inventor： SEZGIN, Nadir ,  DICK, Stephen, G.

IPC: H04B1/707

CPC classification number: H04B1/70755 ,  H04B1/7097

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.

公开(公告)号：EP1188260A1

公开(公告)日：2002-03-20

申请号：EP00937742.5

申请日：2000-05-24

Applicant: INTERDIGITAL TECHNOLOGY CORPORATION

Inventor： SEZGIN, Nadir ,  OZLUTURK, Fatih

IPC: H04B7/26

CPC classification number: H04B1/7083 ,  H04B1/70735 ,  H04B1/70752 ,  H04B2201/70702 ,  H04W28/26 ,  H04W74/04 ,  H04W88/08

Abstract: A base station sends a synchronization signal in an assigned time slot to a user equipment in a time division duplex code division multiple access communication system. The base station has an assigned code group out of a predetermined number of code groups. The base station transmits selected secondary synchronization code signals out of a set of secondary synchronization code signals. The plurality of secondary synchronization code signals numbers less than half of the predetermined number of code groups. The user equipment identifies the transmitted selected secondary code signals. Based on in part the identified secondary synchronization code signals, the assigned code group is determined.