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公开(公告)号：CA2671999A1
公开(公告)日：2000-07-27
申请号：CA2671999
申请日：1999-12-07
Applicant: INTERDIGITAL TECH CORP
Inventor： DICK STEPHEN G , KAZAKEVICH LEONID , OZLUTURK FATIH M
Abstract: The present invention balances the amplitude and phase of a received QPSK signal that may have been corrupted during transmission. The system determines the amplitude of the I and Q symbols of a received signal, compares them, and applies a correction to one or both channels to correct for amplitude imbalance. For phase imbalance, the system calculates the cross-correlation of the I and Q symbols which should average to zero. A correction factor is derived from the cross--correlation and applied to both channels, returning the phase cross-correlation to zero. The output from the system is a signal corrected in both amplitude and phase.
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公开(公告)号：CA2351761A1
公开(公告)日：2000-07-27
申请号：CA2351761
申请日：1999-12-07
Applicant: INTERDIGITAL TECH CORP
Inventor： OZLUTURK FATIH M , KAZAKEVICH LEONID , DICK STEPHEN G
Abstract: The present invention balances the amplitude and phase of a received QPSK signal that may have been corrupted during transmission. The system determin es the amplitude of the I and Q symbols of a received signal, compares them, an d applies a correction to one or both channels to correct for amplitude imbalance. For phase imbalance, the system calculates the cross-correlation of the I and Q symbols which should average to zero. A correction factor is derived from the cross-correlation and applied to both channels, returning t he phase cross-correlation to zero. The output from the system is a signal corrected in both amplitude and phase.
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公开(公告)号：CA2568247A1
公开(公告)日：2000-04-27
申请号：CA2568247
申请日：1999-01-27
Applicant: INTERDIGITAL TECH CORP
Inventor： OZLUTURK FATIH M
IPC: H04B7/216 , H04B1/10 , H04B1/7097 , H04B1/7107
Abstract: An apparatus for code division multiple access (CDMA) wireless communication comprising a receiver configured to receive a CDMA signal that includes a desired traffic signal and a second signal, the desired traffic signal being spread with a desired traffic spreading code and the second signal being spread with a second spreading code; means for generating a second signal cancellation component including means for generating a second signal strength by despreading the CDMA signal based on the second spreading code; means for generating a second signal cancellation factor by selectively combining the second signal spreading code and the desired traffic spreading code; and means for combining the second signal strength and the second signal cancellation factor to generate the second signal cancellation component; means for generating a despread desired traffic signal by despreading the CDMA signal based on the desired traffic spreading code; and means for combining the despread desired traffic signal and the second signal cancellation component to cancel second signal noise from the despread desired traffic signal.
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公开(公告)号：ES2139554T1
公开(公告)日：2000-02-16
申请号：ES97930175
申请日：1997-06-23
Applicant: INTERDIGITAL TECH CORP
Inventor： OZLUTURK FATIH M , LOMP GARY R , HAIM JOHN W
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公开(公告)号：ES2138949T1
公开(公告)日：2000-02-01
申请号：ES98922420
申请日：1998-05-20
Applicant: INTERDIGITAL TECH CORP
Inventor： OZLUTURK FATIH M
Abstract: The present invention provides a spread spectrum transmitter comprising a spread spectrum encoder for encoding digital data to produce a spread spectrum signal and means for transmitting said signal, characterized in that the spread spectrum encoder includes a code generator incorporating an apparatus for generating complex four-phase code division multiple access (CDMA) codes, the apparatus comprising: a plurality of flip flops, an accumulator having a first input for receiving an output from said plurality of flip flops and a second input for receiving a quotient of a parameter M divided by a parameter N, wherein M and N are integers and wherein M is relatively prime to N; said accumulator combines data received via said first and second inputs and outputs the combined data to said flip flops; an extractor extracting a first bit and a second bit from the flip flops; and means for converting the extracted first bit and second bit to I and Q values.
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Patent Agency Ranking66.发明专利
公开(公告)号：AU7497398A
公开(公告)日：1999-05-10
申请号：AU7497398
申请日：1998-05-20
Applicant: INTERDIGITAL TECH CORP
Inventor： OZLUTURK FATIH M
Abstract: The present invention provides a spread spectrum transmitter comprising a spread spectrum encoder for encoding digital data to produce a spread spectrum signal and means for transmitting said signal, characterized in that the spread spectrum encoder includes a code generator incorporating an apparatus for generating complex four-phase code division multiple access (CDMA) codes, the apparatus comprising: a plurality of flip flops, an accumulator having a first input for receiving an output from said plurality of flip flops and a second input for receiving a quotient of a parameter M divided by a parameter N, wherein M and N are integers and wherein M is relatively prime to N; said accumulator combines data received via said first and second inputs and outputs the combined data to said flip flops; an extractor extracting a first bit and a second bit from the flip flops; and means for converting the extracted first bit and second bit to I and Q values.
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公开(公告)号：CA2593776A1
公开(公告)日：1999-04-22
申请号：CA2593776
申请日：1998-10-06
Applicant: INTERDIGITAL TECH CORP
Inventor： OZLUTURK FATIH M
Abstract: A method for use in a code division multiple access (CDMA) subscriber unit, the method comprising receiving first data transmitted from a first base station; selecting a second base station to transmit second data to the CDMA subscriber unit; transmitting a signal to the second base station, wherein the signal designates the second base station, instead of the first base station, to transmit the second data to the CDMA subscriber unit; receiving a power command from the first base station after transmitting the signal; and adjusting an output power of the CDMA subscriber unit in response to the power command after the second base station is selected.
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公开(公告)号：CA2818770A1
公开(公告)日：1997-12-31
申请号：CA2818770
申请日：1997-06-23
Applicant: INTERDIGITAL TECH CORP
Inventor： OZLUTURK FATIH M , LOMP GARY R
Abstract: A communication method for use with a code division multiple access (CDMA) subscriber unit is disclosed. The method includes generating a first code wherein the first code has a first length and generating a second code wherein the second code has a second length greater than the first length and a period which is aligned with the length of the first code. A first radio frequency signal is transmitted from an antenna of the CDMA subscriber unit wherein the first radio frequency signal carries the first code at a first power level, at least a portion of the second code, and data. In an absence of an acknowledgement signal received by the CDMA subscriber unit, a power level of the first code is set to a second power level wherein the second power level is greater than the first power level.
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公开(公告)号：CA2413954A1
公开(公告)日：1997-12-31
申请号：CA2413954
申请日：1997-06-23
Applicant: INTERDIGITAL TECH CORP
Inventor： OZLUTURK FATIH M , HAIM JOHN W , LOMP GARY R
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公开(公告)号：DK1928203T3
公开(公告)日：2012-06-18
申请号：DK08102079
申请日：1998-10-06
Applicant: INTERDIGITAL TECH CORP
Inventor： OZLUTURK FATIH M
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