Patents by Inventor Dipankar Raychaudhuri

Dipankar Raychaudhuri 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: 20130094486
    Abstract: An access point of a wireless network including: a controller for emulating a first virtual access point of a first service provider and a second virtual access point of second service provider; a transceiver port for communicating control signals to clients of the first and service providers to limit the uplink air-time of the clients; and a connection port for linking the first and second service providers to a backhaul.
    Type: Application
    Filed: August 31, 2012
    Publication date: April 18, 2013
    Applicant: RUTGERS, THE STATE UNIVERSITY OF NEW JERSEY
    Inventors: Gautam BHANAGE, Dipti VETE, Ivan SESKAR, Dipankar RAYCHAUDHURI
  • Patent number: 7746802
    Abstract: Disclosed are the design and implementation of a CSI feedback channel in a multi-carrier wireless communication system. An apparatus and a method for channel state feedback using arithmetic coding are provided to ensure efficiency and reliability of a system by transmitting the CSI while compressing the CSI with a predetermined compression rate selected depending on a channel state. The apparatus for CSI feedback in a wireless communication system performing channel estimation at a transmitter or a receiver by using a communication channel includes a transmitter terminal transmitting a signal for CSI measurement by using the communication channel, and a receiver terminal receiving the signal from the transmitter terminal, checking a channel state based on the received signal, and transmitting the signal to the transmitter terminal after compressing the signal according to the channel state.
    Type: Grant
    Filed: May 31, 2005
    Date of Patent: June 29, 2010
    Assignees: Samsung Electronics Co., Ltd., WINLAB, Rutgers University
    Inventors: Chang-Ho Suh, Seok-Hyun Yoon, Dong-Seek Park, Young-Kwon Cho, Dipankar Raychaudhuri, Leonid Razoumov
  • Patent number: 7293109
    Abstract: The present invention changes the wireless information service paradigm from a connection-oriented unicast network model to a dynamic content-driven multicast model using a technique called “content routing.” The present invention provides a system, method, and medium for routing content through a network from at least one content provider to at least one content consumer, wherein at least one of the content consumer or content provider communicate with the network using a wireless device. The content is routed though the network based on its content. The content is labeled with at least one content descriptor. The content descriptor characterizes or otherwise describes the content. Interest profiles are received from content consumers. Interest profiles from content consumers with a common network access point are aggregated into a single interest profile.
    Type: Grant
    Filed: October 15, 2002
    Date of Patent: November 6, 2007
    Assignee: Semandex Networks, Inc.
    Inventors: Maximilian Ott, Daniel J. Reininger, Leslie French, Dipankar Raychaudhuri
  • Publication number: 20050265436
    Abstract: Disclosed are the design and implementation of a CSI feedback channel in a multi-carrier wireless communication system. An apparatus and a method for channel state feedback using arithmetic coding are provided to ensure efficiency and reliability of a system by transmitting the CSI while compressing the CSI with a predetermined compression rate selected depending on a channel state. The apparatus for CSI feedback in a wireless communication system performing channel estimation at a transmitter or a receiver by using a communication channel includes a transmitter terminal transmitting a signal for CSI measurement by using the communication channel, and a receiver terminal receiving the signal from the transmitter terminal, checking a channel state based on the received signal, and transmitting the signal to the transmitter terminal after compressing the signal according to the channel state.
    Type: Application
    Filed: May 31, 2005
    Publication date: December 1, 2005
    Applicants: SAMSUNG ELECTRONICS CO., LTD., WINLAB, RUTGERS UNIVERSITY
    Inventors: Chang-Ho Suh, Seok-Hyun Yoon, Dong-Seek Park, Young-Kwon Cho, Dipankar Raychaudhuri, Leonid Razoumov
  • Publication number: 20030120817
    Abstract: The present invention changes the wireless information service paradigm from a connection-oriented unicast network model to a dynamic content-driven multicast model using a technique called “content routing.” The present invention provides a system, method, and medium for routing content through a network from at least one content provider to at least one content consumer, wherein at least one of the content consumer or content provider communicate with the network using a wireless device. The content is routed though the network based on its content. The content is labeled with at least one content descriptor. The content descriptor characterizes or otherwise describes the content. Interest profiles are received from content consumers. Interest profiles from content consumers with a common network access point are aggregated into a single interest profile.
    Type: Application
    Filed: October 15, 2002
    Publication date: June 26, 2003
    Inventors: Maximilian Ott, Daniel J. Reininger, Leslie French, Dipankar Raychaudhuri
  • Patent number: 6023461
    Abstract: A handoff control process in a wireless ATM network replaces an old communications connection with a new communication connection. In order to guarantee that no data is lost during the replacement process, an ATM cell level mechanism is used to re-schedule the buffering and transmitting of data streams of the virtual channels (VCs) to be handed-off. In addition, this mechanism is transparent to user applications. The present invention performs three fundamental cell level scheduling functions. The first function is to mark and redirect cell transmission with operation and maintenance (OAM) cells. The second function is to disable and buffer cell transmission until the new path is connected. The third function is to enable cell transmission, starting with the buffered cells across the connected new path.
    Type: Grant
    Filed: October 10, 1997
    Date of Patent: February 8, 2000
    Assignee: NEC USA, Inc.
    Inventors: Dipankar Raychaudhuri, Jun Li, Arup Acharya
  • Patent number: 5974036
    Abstract: Mobility in a wireless ATM network is accomplished by use of hand-off control protocols. A mobile terminal signals a first base station that a hand-off is to occur. In a first preferred embodiment the first base station signals a second base station requesting a hand-off. After the second base station signals the first base station that a datapath link is available from a hand-off switch to the second base station, the hand-off switch causes the datapath to change from the first base station to the second base station and the first base station signals the mobile terminal to commence communication with the second base station. In a second preferred embodiment, the mobile terminal signals a first base station that a hand-off is to occur. The first base station signals a second base station requesting a hand-off. At the same time a datapath link is established between the first and second base stations.
    Type: Grant
    Filed: December 24, 1996
    Date of Patent: October 26, 1999
    Assignee: NEC USA, Inc.
    Inventors: Arup Acharya, Jun Li, Dipankar Raychaudhuri, Ruixi Yuan, Subir K. Biswas
  • Patent number: 5717691
    Abstract: A multimedia communications and computer platform that can serve as a network interface card combined with an internal distribution network for a full range of user terminal devices. It includes an interconnection network module that serves to route all incoming and outgoing information by way of high speed buses with value added features for communication protocol acceleration. In particular, attached to the different ports of the network are an ATM module, a communications processor, a media processor and a variety of terminal devices. By migrating processing intensive functions of network protocol termination, media stream distribution and media stream adaptation into the network interface card, there are avoided the bottlenecks of the traditional CPU centric approach to ATM systems.
    Type: Grant
    Filed: October 30, 1995
    Date of Patent: February 10, 1998
    Assignee: NEC USA, Inc.
    Inventors: Rajiv S. Dighe, Zoran Miljanic, Dipankar Raychaudhuri
  • Patent number: 5684791
    Abstract: A data link control procedure for wireless ATM access channels based on a dynamic TDMA/TDD framework provides integrated ATM services including available bit-rate (ABR) data and constant/variable bit-rate (CBR/VBR) voice or video through the addition of wireless-specific medium access control and data link control protocol layers between the physical and ATM network layers. Generally, a data link control is used to insulate the ATM network layer from wireless channel impairments by selective retransmission of erroneous or lost cells before they are released to the ATM layer. The data link control methods disclosed use the on-demand ABR burst transmission capability of the dynamic TDMA channel to retransmit unacknowledged cells in available slots not allocated to service data. Specific error recovery procedures for both (asynchronous) ABR and (isochronous) CBR services are provided.
    Type: Grant
    Filed: November 7, 1995
    Date of Patent: November 4, 1997
    Assignee: NEC USA, Inc.
    Inventors: Dipankar Raychaudhuri, Hai Xie, Ruixi Yuan
  • Patent number: 5675384
    Abstract: A system for variable bit-rate video coding in which encoding bandwidth as characterized by a usage parameter control (UPC) parameters is renegotiated between a video encoder and an asynchronous transfer mode network in order to maintain quality-of-service and save bandwidth. The coding system includes adjusting the video source quantization in a manner for controlling the occupancy level of a buffer while new UPC parameters are requested from an ATM network.
    Type: Grant
    Filed: October 3, 1995
    Date of Patent: October 7, 1997
    Assignee: NEC USA, Inc.
    Inventors: Gopalakrishnan Ramamurthy, Dipankar Raychaudhuri, Daniel Jorge Reininger
  • Patent number: 5638371
    Abstract: A medium access control (MAC) layer protocol is used in a wireless ATM system for integrated support of ATM services, including constant bit-rate (CBR), variable bit-rate (VBR) and available bit-rate (ABR) services. The MAC protocol supports both connectionless packet and connection-oriented virtual circuit modes, with appropriate service parameter and quality-of-services selection. A dynamic time division, multiple access/time division multiplex (TDMA/TDM) approach accommodates the service classes in an integrated manner. A supervisory MAC procedure integrates ATM ABR/VBR/CBR virtual circuits, providing burst-by-burst allocation of ABR cells and call-by-call allocation of VBR and CBR bandwidth parameters. A mechanism is provided for the dynamic allocation of subframe capacities, assignment of ABR slots based on desired queueing rules, assignment of VBR slots based on ATM traffic shaper parameters and assignment of CBR slots based on bandwidth requirements.
    Type: Grant
    Filed: June 27, 1995
    Date of Patent: June 10, 1997
    Assignee: NEC USA, Inc.
    Inventors: Dipankar Raychaudhuri, Hai Xie, Ruixi Yuan
  • Patent number: 5530695
    Abstract: An asynchronous transfer mode (ATM) traffic control framework is based on an integrated usage parameter control (UPC) approach, which approach provides a unified and scalable solution to the issue of quality-of-services (QOS) levels over a range of anticipated services in ATM based networks. The approach is consistent with emerging ATM Forum and CCITT standards. Additionally, a UPC-based call and burst admission control providing the desired QOS over periods of network overload by call/burst admission control and traffic shaping of source stream preferably uses a dual leaky bucket.
    Type: Grant
    Filed: December 15, 1993
    Date of Patent: June 25, 1996
    Assignee: NEC USA, Inc.
    Inventors: Rajiv Dighe, Gopalakrishnan Ramamurthy, Dipankar Raychaudhuri
  • Patent number: 5122875
    Abstract: Apparatus for encoding/decoding a HDTV signal for e.g., terrestrial transmission includes a compression circuit responsive to high definition video source signals for providing ierarchically layered codewords CW representing compressed video data and associated codewords T, defining the types of data represented by the codewords CW. A priority selection circuit, responsive to the codewords CW and T, parses the codewords CW into high and low priority codeword sequences wherein the high and low priority codeword sequences correspond to compressed video data of relatively greater and lesser importance to image reproduction respectively. A transport processor, responsive to the high and low priority codeword sequences, forms high and low priority transport blocks of high and low priority codewords respectively. Each transport block includes a header, codewords CW and error detection check bits. The respective transport blocks are applied to an forward error check circuit for applying additional error check data.
    Type: Grant
    Filed: February 27, 1991
    Date of Patent: June 16, 1992
    Assignee: General Electric Company
    Inventors: Dipankar Raychaudhuri, Joel W. Zdepski, Glenn A. Reitmeier, Charles M. Wine
  • Patent number: 4841527
    Abstract: A CDMA network includes a retransmission scheduler which selectively delays the retransmission of an initially erroneously sent signal. The selected delays have an average value in a range of values which results in a single equilibrium point between input messages and output messages to avoid a bistable condition that can lower overall system throughput.
    Type: Grant
    Filed: November 16, 1987
    Date of Patent: June 20, 1989
    Assignee: General Electric Company
    Inventors: Dipankar Raychaudhuri, Kuriacose Joseph
  • Patent number: 4774707
    Abstract: In a communication system serving a plurality of transmitter-receivers, high capacity is achieved by asynchronous contention access of relatively short reservation request packets, which if successfully transmitted result in the scheduled, noncontention transmission of relatively long message data packets. In a first embodiment, the reservation request packets bear information relating to the duration of the message data packets, so that appropriate message data transmission time may be scheduled. Unsuccessful or colliding reservation request packets are retransmitted. In a second embodiment, the reservation requests packets do not include duration information, and the message data packets have fixed duration. In the second embodiment, collision resolution techniques allow the message data scheduling without retransmission of some colliding reservation request packets.
    Type: Grant
    Filed: September 10, 1986
    Date of Patent: September 27, 1988
    Assignee: General Electric Company
    Inventor: Dipankar Raychaudhuri
  • Patent number: 4745599
    Abstract: A random access communication system forms messages to be transmitted into subpackets of fixed duration. A message packet includes two or more subpackets. Each subpacket includes information relating to the source transmitter-receiver and the number of subpackets in the message. The subpackets of the message packet are transmitted contiguously over the transmission path in a contention mode. Some subpackets are successfully received and some are lost due to collisions. After a period of asynchronous contention operation, a predetermined number of subpackets are successfully received, and the system switches to a short-term synchronous, scheduled operating mode. In the scheduled operating mode, those transmitter-receivers which were the sources of message packets including some successful and some unsuccessful subpackets retransmit the data from the unsuccessful subpackets, ordering themselves in accordance with the order of receipt of successful subpackets.
    Type: Grant
    Filed: January 5, 1987
    Date of Patent: May 17, 1988
    Assignee: General Electric Company
    Inventor: Dipankar Raychaudhuri
  • Patent number: 4688213
    Abstract: An asynchronous random access system includes stations which in one embodiment transmit information as packets at random times. After a path delay, all stations receive the packets. By comparing the period of activity at the station with the known packet length, all stations know when a collision occurs. According to the system protocol, all station inhibit new transmissions for a predetermined time which includes a retransmission time. Stations whose packets were involved in the collision know that their transmission was unsuccessful, and they can also determine whether their own packets were first or last in the collision, based upon the known path delay. Retransmission of the first and last packets occurs during the retransmission interval and is guaranteed to be successful, because all other stations are inhibited.
    Type: Grant
    Filed: November 29, 1985
    Date of Patent: August 18, 1987
    Assignee: RCA Corporation
    Inventor: Dipankar Raychaudhuri
  • Patent number: 4641304
    Abstract: A transmission system employing a satellite and a plurality of ground stations each capable of transmitting and receiving data packets to and from each other via the satellite.
    Type: Grant
    Filed: June 6, 1986
    Date of Patent: February 3, 1987
    Assignee: RCA Corporation
    Inventor: Dipankar Raychaudhuri
  • Patent number: 4536846
    Abstract: An improved companded transmission system uses a transmitter having a first compressor for compressing a signal m(t) of bandwidth B.sub.1 to form a signal C[m(t)]. The transmission system has a bandwidth B.sub.2 where B.sub.1 .ltoreq.B.sub.2. A receiver having an expander to expand the received signal r(t) is provided to produce a signal m.sub.E (t). The improvement consists of a circuit for recovering the frequency components f.sub.L lost during transmission of C[m(t)] and includes a second compressor for compressing m.sub.E (t) in the same manner as m(t) was compressed to produce a signal C[m.sub.E (t)] which contains frequency components f.sub.c lying above B.sub.2. A filter which is responsive to C[m.sub.E (t)] generates (C[m.sub.E (t)]-f.sub.c), and, a subtractor subtracts (C[m.sub.E (t)]-f.sub.c) from C[m.sub.E (t)]. An adder adds f.sub.c to r(t), and, an expander expands the summed signal f.sub.c +r(t) to produce a signal m.sub.1 (t) which is a first order corrected approximation of m(t).
    Type: Grant
    Filed: September 20, 1982
    Date of Patent: August 20, 1985
    Assignee: RCA Corporation
    Inventors: Dipankar Raychaudhuri, Leonard N. Schiff
  • Patent number: 4504946
    Abstract: An improved time division multiple access (TDMA) satellite transmission system uses N TDMA stations and employs a signal format in which successive time frames begin with a header containing synchronizing and control signals generated by a selected TDMA and followed by N time slots, and in which each TDMA station generates and transmits data packets having a high energy level during a unique time slot assigned to each TDMA and in which each TDMA transmits data packets only during its assigned time slot, and further in which at least some of the TDMA's do not transmit data packets in the available time during the assigned time slot, thereby leaving unpredictably occurring idle time. Apparatus is provided for using a substantial portion of the idle time.
    Type: Grant
    Filed: June 11, 1982
    Date of Patent: March 12, 1985
    Assignee: RCA Corporation
    Inventor: Dipankar Raychaudhuri