Patents by Inventor Mahmoud Taherzadehboroujeni

Mahmoud Taherzadehboroujeni 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).

  • Publication number: 20210083798
    Abstract: A transmitter of a communications system includes a first encoder configured to apply a shaping operation to a data signal to generate a shaped data signal, a second encoder configured to encode the shaped data signal according to a forward error correction (FEC) scheme to generate an encoded signal, and a constellation mapper configured to modulate the encoded signal to symbol values according to a modulation scheme to generate a corresponding symbol stream for transmission through the communications system. The shaping operation reduces average constellation energy for constellations of the modulation scheme.
    Type: Application
    Filed: July 31, 2020
    Publication date: March 18, 2021
    Inventors: Shahab OVEIS GHARAN, Kim B. ROBERTS, Akbar GHASEMI, Mahmoud TAHERZADEHBOROUJENI
  • Patent number: 10735135
    Abstract: A transmitter of a communications system includes a first encoder configured to apply a shaping operation to a data signal to generate a shaped data signal, a second encoder configured to encode the shaped data signal according to a forward error correction (FEC) scheme to generate an encoded signal, and a constellation mapper configured to modulate the encoded signal to symbol values according to a modulation scheme to generate a corresponding symbol stream for transmission through the communications system. The shaping operation reduces average constellation energy for constellations of the modulation scheme.
    Type: Grant
    Filed: October 8, 2019
    Date of Patent: August 4, 2020
    Assignee: Ciena Corporation
    Inventors: Shahab Oveis Gharan, Kim B. Roberts, Akbar Ghasemi, Mahmoud Taherzadehboroujeni
  • Publication number: 20200036475
    Abstract: A transmitter of a communications system includes a first encoder configured to apply a shaping operation to a data signal to generate a shaped data signal, a second encoder configured to encode the shaped data signal according to a forward error correction (FEC) scheme to generate an encoded signal, and a constellation mapper configured to modulate the encoded signal to symbol values according to a modulation scheme to generate a corresponding symbol stream for transmission through the communications system. The shaping operation reduces average constellation energy for constellations of the modulation scheme.
    Type: Application
    Filed: October 8, 2019
    Publication date: January 30, 2020
    Inventors: Shahab OVEIS GHARAN, Kim B. ROBERTS, Akbar GHASEMI, Mahmoud TAHERZADEHBOROUJENI
  • Publication number: 20200007217
    Abstract: Methods and devices are provided for MIMO OFDM transmitter and receivers having odd and/even numbers of transmit antennas. Various methods for pre-coding information bits before space time coding (STC) are described for enabling transmission of information bits over all antennas. Methods of decoding received signals that have been pre-coded and STC coded are also provided by embodiments of the invention. Pilot patterns for downlink and uplink transmission between a base station and one or more wireless terminals for three transmit antenna transmitters are also provided.
    Type: Application
    Filed: September 4, 2019
    Publication date: January 2, 2020
    Inventors: Mahmoud Taherzadehboroujeni, Hosein Nikopour, Amir Khandani, Wen Tong, Ming Jia, Peiying Zhu, Dong-Sheng Yu, Jianglei Ma
  • Patent number: 10411783
    Abstract: Methods and devices are provided for MIMO OFDM transmitter and receivers having odd and/even numbers of transmit antennas. Various methods for pre-coding information bits before space time coding (STC) are described for enabling transmission of information bits over all antennas. Methods of decoding received signals that have been pre-coded and STC coded are also provided by embodiments of the invention. Pilot patterns for downlink and uplink transmission between a base station and one or more wireless terminals for three transmit antenna transmitters are also provided. Variable rate codes are provided that combine various fixed rate codes in a manner that results in codes whose rates are dependent on all the various fixed rate codes that are combined.
    Type: Grant
    Filed: October 30, 2017
    Date of Patent: September 10, 2019
    Assignee: Apple Inc.
    Inventors: Mahmoud Taherzadehboroujeni, Hosein Nikopour, Amir Khandani, Wen Tong, Ming Jia, Peiying Zhu, Dong-Sheng Yu, Jianglei Ma
  • Patent number: 10396902
    Abstract: A method of data symbol recovery in a coherent receiver of an optical communications system includes processing data symbol estimates detected from a received optical signal, and determining recovered symbol values from the processed data symbol estimates. The recovered symbol values belong to a symbol constellation having a predetermined asymmetry. Processing the data symbol estimates compensates phase noise that is greater than one decision region of the symbol constellation. A coherent receiver of an optical communications system includes a module configured to process data symbol estimates detected from a received optical signal and a decision circuit configured to determine recovered symbol values from the processed data symbol estimates. The recovered symbol values belong to a symbol constellation having a predetermined asymmetry. Processing the data symbol estimates compensates phase noise that is greater than one decision region of the symbol constellation.
    Type: Grant
    Filed: September 19, 2016
    Date of Patent: August 27, 2019
    Assignee: Ciena Corporation
    Inventors: Shahab Oveis Gharan, Kim B. Roberts, Mahmoud Taherzadehboroujeni, Amir Khandani, Akbar Ghasemi
  • Publication number: 20180069614
    Abstract: Methods and devices are provided for MIMO OFDM transmitter and receivers having odd and/even numbers of transmit antennas. Various methods for pre-coding information bits before space time coding (STC) are described for enabling transmission of information bits over all antennas. Methods of decoding received signals that have been pre-coded and STC coded are also provided by embodiments of the invention. Pilot patterns for downlink and uplink transmission between a base station and one or more wireless terminals for three transmit antenna transmitters are also provided.
    Type: Application
    Filed: October 30, 2017
    Publication date: March 8, 2018
    Inventors: Mahmoud Taherzadehboroujeni, Hosein Nikopour, Amir Khandani, Wen Tong, Ming Jia, Peiying Zhu, Dong-Sheng Yu, Jianglei Ma
  • Patent number: 9813136
    Abstract: Methods and devices are provided for MIMO OFDM transmitter and receivers having odd and/even numbers of transmit antennas. Various methods for pre-coding information bits before space time coding (STC) are described for enabling transmission of information bits over all antennas. Methods of decoding received signals that have been pre-coded and STC coded are also provided by embodiments of the invention. Pilot patterns for downlink and uplink transmission between a base station and one or more wireless terminals for three transmit antenna transmitters are also provided. Variable rate codes are provided that combine various fixed rate codes in a manner that results in codes whose rates are dependent on all the various fixed rate codes that are combined.
    Type: Grant
    Filed: November 21, 2016
    Date of Patent: November 7, 2017
    Assignee: APPLE INC.
    Inventors: Mahmoud Taherzadehboroujeni, Hosein Nikopour, Amir Khandani, Wen Tong, Ming Jia, Peiying Zhu, Dong-Sheng Yu, Jianglei Ma
  • Publication number: 20170272207
    Abstract: A received signal is received over a noise channel. A stream of received symbols is recovered from the received signal. Each symbol is decoded into one or more bits, where a decoded bit of the symbol has a high probability of being in error, and a probability of being a ‘1’ substantially different from 0.5. An inverse mapping is performed on the decoded bits, where the output of the inverse mapping is a stream of bits with a very low probability of being in error and a probability of being a ‘1’ substantially equal to 0.5.
    Type: Application
    Filed: June 8, 2017
    Publication date: September 21, 2017
    Inventors: Shahab OVEIS GHARAN, Kim B. ROBERTS, Akbar GHASEMI, Mahmoud TAHERZADEHBOROUJENI
  • Patent number: 9698939
    Abstract: A method of transmitting a data signal using an optical transmitter of an optical communications system. A first encoder processes an N-bit input vector in accordance with a first mapping to generate a corresponding M-bit data stream. A Forward Error Correction encoder processes the M-bit data stream in accordance with a predetermined FEC encoding scheme to generate an encoded signal. A constellation mapper maps the encoded signal to symbol values in accordance with a predetermined modulation scheme to generate a corresponding symbol stream. A modulator modulates a carrier light in accordance with the encoded symbol stream to generate an optical signal for transmission through the optical communications system. The first mapping can be adjusted to maximize performance of the optical communications system.
    Type: Grant
    Filed: June 13, 2013
    Date of Patent: July 4, 2017
    Assignee: Ciena Corporation
    Inventors: Shahab Oveis Gharan, Kim B. Roberts, Akbar Ghasemi, Mahmoud Taherzadehboroujeni
  • Patent number: 9667348
    Abstract: A receiver of an optical communications system includes a set of two or more analog-to digital A/D converters, a respective transform block connected to an output of each A/D converter, and a summation block. Each A/D converter samples a respective low-bandwidth analog signal comprising a respective portion of a high-bandwidth data signal. Each transform block calculates a set of spectral components of the respective low-bandwidth analog signal. The summation block combines respective spectral components calculated by each transform block to construct spectral terms of a combined signal having a spectrum corresponding to that of the high-bandwidth data signal.
    Type: Grant
    Filed: June 13, 2012
    Date of Patent: May 30, 2017
    Assignee: Ciena Corporation
    Inventors: Kim B. Roberts, Shahab Oveis Gharan, William Martin Snelgrove, Mahmoud Taherzadehboroujeni
  • Patent number: 9647769
    Abstract: In a coherent receiver of an optical communication system, a method of processing a detected symbol estimate to determine a most likely value of a corresponding transmitted data word, the transmitted data word comprising one or more data bits encoded in a transmitter using a predetermined constellation of at least two symbols. A set of two or more virtual constellation points are define in a decision region corresponding to a possible value of the data word. The detected symbol estimate is processed to find a most likely virtual constellation point given the detected symbol estimate. The most likely value of the corresponding transmitted data word is determined based on the most likely virtual constellation point.
    Type: Grant
    Filed: March 23, 2016
    Date of Patent: May 9, 2017
    Assignee: Ciena Corporation
    Inventors: Shahab Oveis Gharan, Kim B. Roberts, Mahmoud Taherzadehboroujeni
  • Publication number: 20170126301
    Abstract: Methods and devices are provided for MIMO OFDM transmitter and receivers having odd and/even numbers of transmit antennas. Various methods for pre-coding information bits before space time coding (STC) are described for enabling transmission of information bits over all antennas. Methods of decoding received signals that have been pre-coded and STC coded are also provided by embodiments of the invention. Pilot patterns for downlink and uplink transmission between a base station and one or more wireless terminals for three transmit antenna transmitters are also provided.
    Type: Application
    Filed: November 21, 2016
    Publication date: May 4, 2017
    Inventors: Mahmoud Taherzadehboroujeni, Hosein Nikopour, Amir Khandani, Wen Tong, Ming Jia, Peiying Zhu, Dong-Sheng Yu, Jianglei Ma
  • Patent number: 9596035
    Abstract: A method of data symbol recovery. An optical signal is modulated by a transmitter using a modulation scheme comprising a symbol constellation having a predetermined asymmetry and detected at a receiver. Phase error estimates corresponding to data symbol estimates detected from the received optical signal are calculated. A phase rotation is calculated based on the phase error estimates, using a filter function, and the phase rotation applied to at least one data symbol estimate to generate a corresponding rotated symbol estimate. The phase error estimates model the asymmetry of the symbol constellation, such that the computed phase rotation can compensate phase noise that is greater than one decision region of the symbol constellation.
    Type: Grant
    Filed: November 29, 2012
    Date of Patent: March 14, 2017
    Assignee: Ciena Corporation
    Inventors: Shahab Oveis Gharan, Kim B. Roberts, Mahmoud Taherzadehboroujeni, Amir Khandani, Akbar Ghasemi
  • Publication number: 20170005734
    Abstract: A method of data symbol recovery in a coherent receiver of an optical communications system includes processing data symbol estimates detected from a received optical signal, and determining recovered symbol values from the processed data symbol estimates. The recovered symbol values belong to a symbol constellation having a predetermined asymmetry. Processing the data symbol estimates compensates phase noise that is greater than one decision region of the symbol constellation. A coherent receiver of an optical communications system includes a module configured to process data symbol estimates detected from a received optical signal and a decision circuit configured to determine recovered symbol values from the processed data symbol estimates. The recovered symbol values belong to a symbol constellation having a predetermined asymmetry. Processing the data symbol estimates compensates phase noise that is greater than one decision region of the symbol constellation.
    Type: Application
    Filed: September 19, 2016
    Publication date: January 5, 2017
    Applicant: Ciena Corporation
    Inventors: Shahab OVEIS GHARAN, Kim B. ROBERTS, Mahmoud TAHERZADEHBOROUJENI, Amir KHANDANI, Akbar GHASEMI
  • Patent number: 9509384
    Abstract: Methods and devices are provided for MIMO OFDM transmitter and receivers having odd and/even numbers of transmit antennas. Various methods for pre-coding information bits before space time coding (STC) are described for enabling transmission of information bits over all antennas. Methods of decoding received signals that have been pre-coded and STC coded are also provided by embodiments of the invention. Pilot patterns for downlink and uplink transmission between a base station and one or more wireless terminals for three transmit antenna transmitters are also provided. Variable rate codes are provided that combine various fixed rate codes in a manner that results in codes whose rates are dependent on all the various fixed rate codes that are combined.
    Type: Grant
    Filed: November 12, 2013
    Date of Patent: November 29, 2016
    Assignee: APPLE INC.
    Inventors: Mahmoud Taherzadehboroujeni, Hosein Nikopour, Amir Khandani, Wen Tong, Ming Jia, Peiying Zhu, Dong-Sheng Yu, Jianglei Ma
  • Publication number: 20160254937
    Abstract: Systems and methods of low complexity SCMA/LDS detection are disclosed by performing a detection algorithm such as a Message Passing Algorithm (MPA) in a receiver only over selective sub-graphs of a corresponding full factor graph representative of multiplexed codes for the multiple access code system.
    Type: Application
    Filed: February 27, 2015
    Publication date: September 1, 2016
    Inventors: Alireza Bayesteh, Hosein Nikopour, Mohammadhadi Baligh, Mahmoud Taherzadehboroujeni
  • Publication number: 20160204902
    Abstract: In a coherent receiver of an optical communication system, a method of processing a detected symbol estimate to determine a most likely value of a corresponding transmitted data word, the transmitted data word comprising one or more data bits encoded in a transmitter using a predetermined constellation of at least two symbols. A set of two or more virtual constellation points are define in a decision region corresponding to a possible value of the data word. The detected symbol estimate is processed to find a most likely virtual constellation point given the detected symbol estimate. The most likely value of the corresponding transmitted data word is determined based on the most likely virtual constellation point.
    Type: Application
    Filed: March 23, 2016
    Publication date: July 14, 2016
    Applicant: CIENA CORPORATION
    Inventors: Shahab OVEIS GHARAN, Kim B. ROBERTS, Mahmoud TAHERZADEHBOROUJENI
  • Patent number: 9325427
    Abstract: In a coherent receiver of an optical communication system, a method of processing a detected symbol estimate to determine a most likely value of a corresponding transmitted data word, the transmitted data word comprising one or more data bits encoded in a transmitter using a predetermined constellation of at least two symbols. A set of two or more virtual constellation points are define in a decision region corresponding to a possible value of the data word. The detected symbol estimate is processed to find a most likely virtual constellation point given the detected symbol estimate. The most likely value of the corresponding transmitted data word is determined based on the most likely virtual constellation point.
    Type: Grant
    Filed: October 31, 2012
    Date of Patent: April 26, 2016
    Assignee: CIENA CORPORATION
    Inventors: Shahab Oveis Gharan, Kim B. Roberts, Mahmoud Taherzadehboroujeni
  • Patent number: 9143238
    Abstract: A method of transmitting a data signal using an optical transmitter of an optical communications system. The optical transmitter is configured to modulate an optical carrier in successive signalling intervals to generate an optical signal. A modulation scheme is provided which comprises a multi-dimensional symbol constellation. The modulation scheme is designed such that an average degree of polarization of a modulated optical signal output from the optical transmitter has a first value when averaged across a first signaling interval, and has a second value when averaged across more than one and fewer than 100 signaling intervals. The second value is less than 10 percent of the first value. During run-time, an encoder of the optical transmitter encoding a data signal to be transmitted as symbols of the constellation, and a modulator of the optical transmitter modulating available dimensions of the optical carrier in accordance with the symbols.
    Type: Grant
    Filed: August 19, 2013
    Date of Patent: September 22, 2015
    Assignee: CIENA CORPORATION
    Inventors: Kim B. Roberts, Maurice O'Sullivan, Mahmoud Taherzadehboroujeni, Shahab Oveis Gharan, Andrew D. Shiner, Michael Andrew Reimer