Patents by Inventor Parthapratim De
Parthapratim De has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20020154599Abstract: A code division multiple access base station is used in receiving a plurality of data signals over a shared spectrum. Each received data signal experiences a similar channel response. A combined signal of the received data signals is received over the shared spectrum. The combined signal is sampled at a multiple of the chip rate. A channel response is estimated. A column of a channel correlation matrix is determined using the estimated channel response. A spread data vector is determined using the determined column, the estimated channel response, the received combined signal and a fourier transform. Data of the data signals is estimated using the spread data vector.Type: ApplicationFiled: February 21, 2002Publication date: October 24, 2002Applicant: InterDigital Technology CorporationInventors: Parthapratim De, Ariela Zeira, Jung-Lin Pan, Raj Mani Misra
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Publication number: 20020154619Abstract: A code division multiple access base station is used in receiving a plurality of data signals over a shared spectrum. Each received data signal experiences a similar channel response. A combined signal of the received data signals is received over the shared spectrum. The combined signal is sampled at a multiple of the chip rate. A channel response is estimated as a channel response matrix at the multiple of the chip rate. A padded version of a spread data vector of a size corresponding to the multiple chip rate using a column of the channel response matrix, the estimated channel response matrix, the samples and a fourier transform. The spread data vector is estimated by eliminating elements of the padded version so that the estimated spread data vector is of a size corresponding to the chip rate.Type: ApplicationFiled: February 21, 2002Publication date: October 24, 2002Applicant: InterDigital Technology CorporationInventors: Parthapratim De, Ariela Zeira, Jung-Lin Pan, Raj Mani Misra
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Publication number: 20020145989Abstract: A transmitter site transmits a plurality of data signals over a shared spectrum in a code division multiple access communication system. Each transmitted data signal experiences a similar channel response. A combined signal of the transmitted data signals is received. The combined signal is sampled at a multiple of the chip rate. The channel response for the combined signal is determined. A first element of a spread data vector is determined using the combined signal samples and the estimated channel response. Using a factor from the first element determination, remaining elements of the spread data vector are determined. The data of the data signals is determined using the determined elements of the spread data vector.Type: ApplicationFiled: November 7, 2001Publication date: October 10, 2002Applicant: InterDigital Technology CorporationInventors: Parthapratim De, Ariela Zeira, Jung-Lin Pan, Raj Mini Misra
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Publication number: 20020141372Abstract: A code division multiple access base station is used in receiving a plurality of data signals over a shared spectrum. Each received data signal experiences a similar channel response. A combined signal of the received data signals is received over the shared spectrum. The combined signal is sampled at a multiple of the chip rate. A channel response is estimated. A cross correlation matrix is determined using the estimated channel response. A subblock of the cross correlation matrix is selected. A Cholesky factor for the subblock is determined. The Cholesky factor is extended. The spread data vector is determined using the extended Cholesky factor, a version of the channel response and the samples. Data of the data signals is estimated using the spread data vector.Type: ApplicationFiled: February 21, 2002Publication date: October 3, 2002Applicant: InterDigital Technology CorporationInventors: Parthapratim De, Ariela Zeira, Jung-Lin Pan, Raj Mani Misra
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Publication number: 20020141373Abstract: A code division multiple access base station is used in receiving a plurality of data signals over a shared spectrum. Each received data signal experiences a similar channel response. A combined signal of the received data signals is received over a shared spectrum. The combined signal is sampled at a multiple of the chip rate. A channel response is estimated. A first element of a spread data vector is determined using the combined signal samples and the estimated channel response. A factor from the first element determination is used to determine remaining elements of the spread data vector. Data of the data signals is estimated using the determined elements of the spread data vector.Type: ApplicationFiled: February 21, 2002Publication date: October 3, 2002Applicant: InterDigital Technology CorporationInventors: Parthapratim De, Ariela Zeira, Jung-Lin Pan, Raj Mani Misra
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Publication number: 20020141366Abstract: A code division multiple access user equipment is used in receiving a plurality of data signals over a shared spectrum. Each received data signal experiences a similar channel response. A combined signal of the received data signals is received over the shared spectrum. The combined signal is sampled at a multiple of the chip rate. A channel response is estimated as a channel response matrix at the multiple of the chip rate. A padded version of a spread data vector of a size corresponding to the multiple chip rate using a column of the channel response matrix, the estimated channel response matrix, the samples and a fourier transform. The spread data vector is estimated by eliminating elements of the padded version so that the estimated spread data vector is of a size corresponding to the chip rate.Type: ApplicationFiled: February 21, 2002Publication date: October 3, 2002Applicant: InterDigital Technology CorporationInventors: Parthapratim De, Ariela Zeira, Jung-Lin Pan, Raj Mani Misra
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Publication number: 20020136160Abstract: A code division multiple access user equipment is used in receiving a plurality of data signals over a shared spectrum. Each received data signal experiences a similar channel response. A combined signal of the received data signals is received over a shared spectrum. The combined signal is sampled at a multiple of the chip rate. A channel response is estimated. A first element of a spread data vector is determined using the combined signal samples and the estimated channel response. A factor from the first element determination is used to determine remaining elements of the spread data vector. Data of the data signals is estimated using the determined elements of the spread data vector.Type: ApplicationFiled: February 21, 2002Publication date: September 26, 2002Applicant: InterDigital Technology CorporationInventors: Parthapratim De, Ariela Zeira, Jung-Lin Pan, Raj Mani Misra
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Publication number: 20020131383Abstract: A code division multiple access user equipment is used in receiving a plurality of data signals over a shared spectrum. Each received data signal experiences a similar channel response. A combined signal of the received data signals is received over the shared spectrum. The combined signal is sampled at a multiple of the chip rate. A channel response is estimated. A cross correlation matrix is determined using the estimated channel response. The spread data vector is determined using order recursions by determining a first spread data estimate using an element from the cross correlation matrix and recursively determining further estimates using additional elements of the cross correlation matrix. Data of the data signals is estimated using the spread data vector.Type: ApplicationFiled: February 21, 2002Publication date: September 19, 2002Applicant: InterDigital Technology CorporationInventors: Parthapratim De, Ariela Zeira, Jung-Lin Pan, Raj Mani Misra
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Publication number: 20020131384Abstract: A code division multiple access base station is used in receiving a plurality of data signals over a shared spectrum. Each received data signal experiences a similar channel response. A combined signal of the received data signals is received over the shared spectrum. The combined signal is sampled at a multiple of the chip rate. A channel response is estimated at the multiple of the chip rate. The multiple chip rate estimated channel response is combined as an effective chip rate channel response. A spread data vector is determined using the effective samples, the effective channel response and a fourier transform. Data of the data signals is estimated using the spread data vector.Type: ApplicationFiled: February 21, 2002Publication date: September 19, 2002Applicant: InterDigital Technology CorporationInventors: Parthapratim De, Ariela Zeira, Jung-Lin Pan, Raj Mani Misra
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Publication number: 20020126619Abstract: A code division multiple access user equipment is used in receiving a plurality of data signals over a shared spectrum. Each received data signal experiences a similar channel response. A combined signal of the received data signals is received over the shared spectrum. The combined signal is sampled at a multiple of the chip rate. A channel response is estimated. A column of a channel correlation matrix is determined using the estimated channel response. A spread data vector is determined using the determined column, the estimated channel response, the received combined signal and a fourier transform. Data of the data signals is estimated using the spread data vector.Type: ApplicationFiled: February 21, 2002Publication date: September 12, 2002Applicant: InterDigital Technology CorporationInventors: Parthapratim De, Ariela Zeira, Jung-Lin Pan, Raj Mani Misra
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Publication number: 20020126646Abstract: A code division multiple access user equipment is used in receiving a plurality of data signals over a shared spectrum. Each received data signal experiences a similar channel response. A combined signal of the received data signals is received over the shared spectrum. The combined signal is sampled at a multiple of the chip rate. A channel response is estimated. A cross correlation matrix is determined using the estimated channel response. A subblock of the cross correlation matrix is selected. A Cholesky factor for the subblock is determined. The Cholesky factor is extended. The spread data vector is determined using the extended Cholesky factor, a version of the channel response and the samples. Data of the data signals is estimated using the spread data vector.Type: ApplicationFiled: February 21, 2002Publication date: September 12, 2002Applicant: InterDigital Technology CorporationInventors: Parthapratim De, Ariela Zeira, Jung-Lin Pan, Raj Mani Misra