Patents by Inventor Neda Cvijetic

Neda Cvijetic 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).

  • Efficient Square-Root Free 2 Symbol Max-Log Receiver
    Publication number: 20120250804
    Abstract: The present invention employs a look up table based implementation for the metric computations which eliminate redundancy and substantially reduce the number of multiplications. Moreover, inventive method exploits the fact that the un-normalized constellation symbols are complex integers so that the product of a real-number and an un-normalized constellation symbol can be implemented by only additions. The inventive method also enables a greater efficiency for whitening colored noise prior to demodulation, one of which involves no square-root operation.
    Type: Application
    Filed: March 29, 2012
    Publication date: October 4, 2012
    Applicant: NEC LABORATORIES AMERICA, INC.
    Inventors: Narayan Prasad, Neda Cvijetic, Sampath Rangarajan, Ting Wang
  • COMPUTATIONALLY-EFFICIENT EQUALIZATION IN POLMUX OFDM TRANSMISSION WITH DIRECT-DETECTION VIA JOINT TRANSMITTER AND RECEIVER PROCESSING
    Publication number: 20120251110
    Abstract: A method for joint transmitter and receiver processing for computationally efficient equalization in polarization multiplexed (POLMUX) optical orthogonal frequency division multiplexed (OFDM) transmission with direct detection.
    Type: Application
    Filed: March 31, 2011
    Publication date: October 4, 2012
    Applicant: NEC Laboratories America, Inc.
    Inventors: Neda CVIJETIC, Narayan PRASAD, Dayou QIAN, Ting WANG
  • Single wavelength source-free OFDMA-PON communication systems and methods
    Patent number: 8233797
    Abstract: Methods and systems for processing communication signals in an Orthogonal Frequency Division Multiple Access (OFDMA)-Passive Optical Network (PON) are disclosed. An optical carrier at a wavelength generated at an optical line terminal (OLT) may be reused by optical network units (ONUs) in the network for upstream transmission of data signals to the OLT. In addition, each ONU may perform carrier suppression to avoid broadband beating noise resulting from the simultaneous transmission of upstream data signals on the same wavelength. Further, the optical source at the OLT used to generate the optical carrier may be reused as a local oscillator for coherent detection of received upstream signals to minimize any frequency offsets.
    Type: Grant
    Filed: August 21, 2009
    Date of Patent: July 31, 2012
    Assignee: NEC Laboratories America, Inc.
    Inventors: Dayou Qian, Neda Cvijetic, Junqiang Hu, Ting Wang
  • COMPUTATIONALLY-EFFICIENT MIMO EQUALIZATION ALGORITHM FOR HIGH-SPEED, REAL-TIME, ADAPTIVE POLARIZATION MULTIPLEXED (POLMUX) OFDM TRANSMISSION WITH DIRECT DETECTION
    Publication number: 20110310951
    Abstract: A polarization-multiplexed (POLMUX) optical orthogonal frequency division multiplexing (OFDM) system with direct detection includes an adaptive dual POLMUX carrier OFDM transmitter; and a block symmetric (B-S) MIMO equalizer coupled to the adaptive dual POLMUX carrier OFDM transmitter through a standard single-mode-fiber (SSMF) feedback path.
    Type: Application
    Filed: June 18, 2010
    Publication date: December 22, 2011
    Applicant: NEC LABORATORIES AMERICA, INC.
    Inventors: Neda Cvijetic, Narayan Prasad, Dayou Qian, Ting Wang
  • SINGLE WAVELENGTH SOURCE-FREE OFDMA-PON COMMUNICATION SYSTEMS AND METHODS
    Publication number: 20100215368
    Abstract: Methods and systems for processing communication signals in an Orthogonal Frequency Division Multiple Access (OFDMA)-Passive Optical Network (PON) are disclosed. An optical carrier at a wavelength generated at an optical line terminal (OLT) may be reused by optical network units (ONUs) in the network for upstream transmission of data signals to the OLT. In addition, each ONU may perform carrier suppression to avoid broadband beating noise resulting from the simultaneous transmission of upstream data signals on the same wavelength. Further, the optical source at the OLT used to generate the optical carrier may be reused as a local oscillator for coherent detection of received upstream signals to minimize any frequency offsets.
    Type: Application
    Filed: August 21, 2009
    Publication date: August 26, 2010
    Applicant: NEC Laboratories America, Inc.
    Inventors: Dayou Qian, Neda Cvijetic, Junqiang Hu, Ting Wang
  • HIGH SPEED POLMUX-OFDM USING DUAL-POLMUX CARRIERS AND DIRECT DETECTION
    Publication number: 20100086303
    Abstract: A polarization multiplexing, orthogonal frequency division multiplexing (POMUX) transmission system utilizing direct detection.
    Type: Application
    Filed: October 1, 2009
    Publication date: April 8, 2010
    Applicant: NEC LABORATORIES AMERICA INC
    Inventors: Dayou QIAN, Neda CVIJETIC, Yue-Kai HUANG, Jianjun YU, Ting WANG