Patents by Inventor Sean A. Ramprashad

Sean A. Ramprashad 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: 20100111232
    Abstract: The techniques and components described herein may improve the performance for a class of reduced-complexity receiver designs for coded OFDM MIMO systems with bit interleaved coded modulation. The receiver structures described are soft-input soft-output inner/outer decoder receiver structures that include one or more of the following: 1) an inner decoder that includes a linear front-end followed by a limited tree-search based on a soft-output M-algorithm; 2) a conventional near-optimal or optimal decoder for the outer binary code; and 3) iterative decoding (ID), whereby decoding (output) information is passed from one decoder module as input to the other and used to refine and improve the inner/outer decoding module outputs.
    Type: Application
    Filed: September 11, 2009
    Publication date: May 6, 2010
    Inventors: Haralabos Papadopoulos, Ming-Yang Chen, Sean A. Ramprashad
  • Publication number: 20100056171
    Abstract: Methods, architectures and techniques of operating a joint beam-forming and user-selection system across multiple cells for downlink communication in a multi-cell environment. The system coordinates beamforming vector and user selection across multiple cells, but is cellular in the sense that users are served only from the transmission signals originating from one cell. There is provided methods, architectures and techniques to control the level and effect of inter-cell interference through a partially coordinated multi-cell process of user scheduling and beam selection based on the division of cells into different subsets. Multi-step techniques are utilized that can scale to large numbers of cells, specifying which operations remain as independent operations within a cell, and which operations, with what cells, require information exchange.
    Type: Application
    Filed: August 24, 2009
    Publication date: March 4, 2010
    Inventors: Sean A. Ramprashad, Xiaojun Tang, Haralabos C. Papadopoulos
  • Publication number: 20100040163
    Abstract: A method, apparatus and system are disclosed herein for channel classification and adaptation.
    Type: Application
    Filed: August 10, 2009
    Publication date: February 18, 2010
    Inventors: Giuseppe Caire, Carl-Erik W. Sundberg, Haralabos Papadopoulos, Sean A. Ramprashad
  • Publication number: 20100041407
    Abstract: A method and system is disclosed herein for scheduling in a multi-cell environment.
    Type: Application
    Filed: August 10, 2009
    Publication date: February 18, 2010
    Inventors: Giuseppe Caire, Sean A. Ramprashad, Haralabos Papadopoulos
  • Publication number: 20100041408
    Abstract: A method and apparatus is disclosed herein for varying transmit power patterns in a multi-cell wireless transmission environment. In one embodiment, the method comprises varying transmit power coordination patterns for base stations in the wireless communication system to jointly vary base station power over a set of virtual channels over base stations within a cluster and across clusters of base stations; and jointly transmitting by groups of the base stations to one or more user terminals in their respective clusters based on the transmit power coordination patterns.
    Type: Application
    Filed: August 10, 2009
    Publication date: February 18, 2010
    Inventors: Giuseppe Caire, Haralabos Papadopoulos, Sean A. Ramprashad, Christine Pepin
  • Publication number: 20090220034
    Abstract: A method and apparatus is disclosed herein for receiving a layered transmission of data in a wireless communication system using an iterative layered receiver structure.
    Type: Application
    Filed: December 15, 2008
    Publication date: September 3, 2009
    Inventors: Sean A. Ramprashad, Carl-Erik W. Sundberg
  • Publication number: 20080317243
    Abstract: A method and apparatus is disclosed herein for a low complexity method of securing content that is coded by a rateless code whereby it is noted that it is sufficient to encrypt only a subset of the ratelessly coded packets. In one embodiment, the method comprises performing rateless coding on a first set of blocks of data to produce ratelessly encoded blocks of data and performing encryption on a subset of the ratelessly encoded blocks of data based on a degree value for each of the ratelessly encoded blocks of data.
    Type: Application
    Filed: March 26, 2008
    Publication date: December 25, 2008
    Inventor: Sean A. Ramprashad
  • Publication number: 20080225751
    Abstract: A method and apparatus is disclosed herein for information delivery with network coding over time-varying network topologies. In one embodiment, the method comprises decomposing a sequence of topology graphs that model a time-varying network topology into a plurality of virtual graphs, where each virtual graph of the plurality of virtual graphs corresponds to a distinct traffic class, and the virtual topology graph representing a partial topology of a time-varying network.
    Type: Application
    Filed: February 29, 2008
    Publication date: September 18, 2008
    Inventors: Ulas C. Kozat, Christine Pepin, Haralabos Papadopoulos, Sean A. Ramprashad, Carl-Erik W. Sundberg
  • Publication number: 20080144497
    Abstract: A method and a system control admission for voice transmission over a multi-hop network. The method takes multiple parameters into account in order to make a decision and ensures that the system remains stable. The parameters may include options (e.g., aggregation level, bursting level, and transmission rate) and constraints (e.g., the number of users, access points, or sensing range of each user). The method computes the load of the network given each set of options and constraints and compares it against the packetization interval of the voice codec to check whether or not the system is stable. An algorithm of the method finds the best trade-offs between overhead reduction (e.g., due to contention and to packet headers) and a solution robust to channel errors, if links are noisy. If several stable solutions corresponding to different options exist, additional criteria (e.g., the least number of hops, the highest transmission rate) may be used to determine the final “best” solution.
    Type: Application
    Filed: December 13, 2007
    Publication date: June 19, 2008
    Inventors: Sean A. Ramprashad, Danjue Li, Ulas C. Kozat, Christine Pepin
  • Publication number: 20080089333
    Abstract: A method and apparatus is disclosed herein for delivering information over time-varying networks. In one embodiment, the method comprises, for each of a plurality of time intervals, determining a virtual network topology for use over each time interval; selecting for the time interval based on the virtual network topology, a fixed network code for use during the time interval; and coding information to be transmitted over the time-varying network topology using the fixed network code with necessary virtual buffering at each node.
    Type: Application
    Filed: October 16, 2007
    Publication date: April 17, 2008
    Inventors: Ulas C. Kozat, Haralabos Papadopoulos, Christine Pepin, Sean A. Ramprashad, Carl-Erik W. Sundberg