Search

Rajiv N Vijayan

from Del Mar, CA
Age ~60
Get Report
Also known as:
Rajiv Living Vijayan
Phone and address:
933 Avocado Pl, Del Mar, CA 92014
(858) 547-4497
Related to:
Anju Sreenivasan, 52Sreenivasan A Vijayan
Connected to:
Ashwini P Vijayan, 43Bijesh Vijayan, 48Edathil Vijayan, 81Puthan M Vijayan, 73Rajeev Vijayan, 75Rajesh K Vijayanandam, 49Sandhya M Vijayan, 45Santhosh K Vijayanathan, 54Sathish Vijayan, 43Shilpa Vijayan, 53

Rajiv Vijayan Phones & Addresses

  • 933 Avocado Pl, Del Mar, CA 92014 (858) 547-4497
  • 9604 Babauta Rd, San Diego, CA 92129
  • North Brunswick, NJ
  • Urbana, IL
  • Princeton, NJ
  • 933 Avocado Pl, Del Mar, CA 92014

Work

Company: Rutgers university 1991 to 1993 Position: Postdoctoral researcher

Education

School / High School: University of Illinois at Urbana - Champaign 1986 to 1991

Skills

Technology • Wireless • Solutions • Business Solution • San

Industries

Wireless

Resumes

Resumes

Rajiv Vijayan Photo 1

Vp, Technology

View page
Location:
9604 Babauta Rd, San Diego, CA 92129
Industry:
Wireless
Work:
Rutgers University 1991 - 1993
Postdoctoral Researcher
Qualcomm 1991 - 1993
Vp, Technology
Education:
University of Illinois at Urbana - Champaign 1986 - 1991
Indian Institute of Technology, Madras 1982 - 1986
Loyola School 1969 - 1980
University of Illinois at Urbana - Champaign;;1986 – 1991;
Skills:
Technology
Wireless
Solutions
Business Solution
San

Publications

Us Patents

Coding System Having State Machine Based Interleaver

View page
US Patent:
6353900, Mar 5, 2002
Filed:
Oct 13, 1998
Appl. No.:
09/172069
Inventors:
Jeremy Stein - Tel-Aviv, IL
Rajiv Vijayan - San Diego CA
Fuyun Ling - San Diego CA
Assignee:
Qualcomm Incorporated - San Diego CA
International Classification:
H03M 1327
US Classification:
714701, 714702
Abstract:
The present invention is a novel and improved technique for performing coding with particular application to turbo, or iterative, coding techniques. In accordance with one embodiment of the invention, interleaving is performed by generating the address of a memory using a PN state generator. Data is written into a memory in sequential order, and then read out using addresses specified by the PN state generator. To deinterleave, the interleaved data is written into a memory using addresses specified by the PN state generator, and then read out in sequential order. A set of PN state generators that provide excellent coding performance is provided.

Methods And Apparatus For Allocation Of Power To Base Station Channels

View page
US Patent:
6678257, Jan 13, 2004
Filed:
Sep 25, 2000
Appl. No.:
09/669950
Inventors:
Rajiv Vijayan - San Diego CA
Peter J. Black - San Diego CA
Eduardo A. S. Esteves - San Diego CA
Assignee:
Qualcomm, Incorporated - San Diego CA
International Classification:
H04B 7216
US Classification:
370320, 455522
Abstract:
A method and apparatus that determines how much power to allocate to each of a plurality of reverse link power control (RLPC) Channels to be transmitted from a base station, based upon data rate control (DRC) messages transmitted to the base station. The DRC messages transmitted to the base station are used to determine the quality of the Forward Link over which the RLPC is to be transmitted. Even though the remote station to which the RLPC Channel is to be directed has not transmitted a DRC, the base station is capable of allocating power to the RLPC Channel based upon information provided to the base station in DRCs that were received by the base station. Accordingly, the base station can allocate power among the RLPC Channels without having received explicit information as to the quality of the Forward Link between the base station and every remote station intended to receive the information on the RLPC Channels.

Method And System For Selecting A Best Serving Sector In A Cdma Data Communication System

View page
US Patent:
6680925, Jan 20, 2004
Filed:
Oct 16, 2001
Appl. No.:
09/982239
Inventors:
Qiang Wu - San Diego CA
Peter J. Black - San Diego CA
Rajiv Vijayan - San Diego CA
Rashid Attar - San Diego CA
Assignee:
Qualcomm Incorporated - San Deigo CA
International Classification:
H04Q 700
US Classification:
370329, 370331, 370332
Abstract:
In a disclosed embodiment, signal levels of the active sectors of an access terminal are compared with the signal level of the current serving sector of the access terminal. Next, a delta credit is accumulated. If a DRC lock bit is available, then an accumulated total credit is authorized to produce an authorized accumulated total credit. Afterwards, a new serving sector is identified from a pool of candidate sectors based on the signal levels of the active sectors and the authorized accumulated total credits.

Bit Interleaving For Orthogonal Frequency Division Multiplexing In The Transmission Of Digital Signals

View page
US Patent:
6717908, Apr 6, 2004
Filed:
May 10, 2001
Appl. No.:
09/853341
Inventors:
Rajiv Vijayan - San Diego CA
Joseph P. Odenwalder - Del Mar CA
Jack K. Wolf - La Jolla CA
Chong U. Lee - San Diego CA
Ephraim Zehavi - Haifa, IL
Assignee:
Qualcomm, Incorporated - San Diego CA
International Classification:
H04J 1100
US Classification:
370206, 375316
Abstract:
In an orthogonal frequency division multiplexing (OFDM) system which uses an outer Reed-Solomon encoder and interleaver an inner convolutional encoder, after the inner convolutional encoding the data bits are interleaved, and then grouped into symbols, each symbol having âmâ bits. After grouping, the symbols are mapped to a complex plane using quadrature amplitude modulation (QAM). Thus, bits, not symbols, are interleaved by the inner interleaver. A receiver performs a soft decision regarding the value of each bit in each complex QAM symbol received.

Method And Apparatus For Selecting A Serving Sector In A Data Communication System

View page
US Patent:
6757520, Jun 29, 2004
Filed:
Jun 26, 2001
Appl. No.:
09/892378
Inventors:
Rashid A. Attar - San Diego CA
Rajiv Vijayan - San Diego CA
Roberto Padovani - San Diego CA
Qiang Wu - San Diego CA
Peter J. Black - San Diego CA
Eduardo A. S. Esteves - San Diego CA
Assignee:
Qualcomm Incorporated - San Diego CA
International Classification:
H04B 100
US Classification:
455 631, 455450, 455437, 370332
Abstract:
Methods and apparatus for selecting a serving sector in a high rate data (HDR) communication system are disclosed. An exemplary HDR communication system defines a set of data rates, at which a sector of an Access Point may send data packets to an Access Terminal. The sector is selected by the Access Terminal to achieve the highest data throughput while maintaining a targeted packet error rate. The Access Terminal employs various methods to evaluate quality metrics of forward and reverse links from and to different sectors, and uses the quality metrics to select the sector to send data packets to the Access Terminal.

Rate Adaptive Transmission Scheme For Mimo Systems

View page
US Patent:
6873606, Mar 29, 2005
Filed:
Feb 14, 2003
Appl. No.:
10/367234
Inventors:
Avneesh Agrawal - San Jose CA, US
Rajiv Vijayan - San Diego CA, US
Tamer Kadous - San Diego CA, US
Assignee:
QUALCOMM, Incorporated - San Diego CA
International Classification:
H04B001/02
US Classification:
370310, 375267
Abstract:
A rate adaptive transmission scheme for MIMO systems, which can transmit a variable number of data symbol streams, provide transmit diversity for each data symbol stream, and fully utilize the total transmit power of the system and the full power of each antenna. In one method, at least one data symbol stream is received for transmission from a plurality of antennas. Each data symbol stream is scaled with a respective weight corresponding to the amount of transmit power allocated to that stream. The scaled data symbol stream(s) are multiplied with a transmit basis matrix to provide a plurality of transmit symbol streams for the plurality of antennas. The transmit basis matrix (e. g. , a Walsh-Hadamard matrix or a DFT matrix) is defined such that each data symbol stream is transmitted from all antennas and each transmit symbol stream is transmitted at (or near) the full power for the associated antenna.

Uplink Pilot And Signaling Transmission In Wireless Communication Systems

View page
US Patent:
6928062, Aug 9, 2005
Filed:
Jan 10, 2003
Appl. No.:
10/340507
Inventors:
Ranganathan Krishnan - San Diego CA, US
Rajiv Vijayan - San Diego CA, US
Tamer Kadous - San Diego CA, US
Assignee:
Qualcomm, Incorporated - San Diego CA
International Classification:
H04Q007/00
US Classification:
370329, 370208, 370310, 455436
Abstract:
Techniques to more efficiently transmit pilot and signaling on the uplink in an OFDM system. With subband multiplexing, M usable subbands in the system are partitioned into Q disjoint groups of subbands. Each subband group may be assigned to a different terminal for uplink pilot transmission. Multiple terminals may transmit simultaneously on their assigned subbands. The transmit power for the pilot may be scaled higher to attain the same total pilot energy even though S instead of M subbands are used for pilot transmission by each terminal. Pilot transmissions from the terminals are received, and a channel estimate is derived for each terminal based on the pilot received on the assigned subbands. The channel estimate comprises a response for additional subbands not included in the assigned group. Subband multiplexing may also be used for uplink signaling transmission.

Uplink Pilot And Signaling Transmission In Wireless Communication Systems

View page
US Patent:
7042857, May 9, 2006
Filed:
May 25, 2005
Appl. No.:
11/138824
Inventors:
Ranganathan Krishnan - San Diego CA, US
Rajiv Vijayan - San Diego CA, US
Tamer Kadous - San Diego CA, US
Assignee:
QUALCOM, Incorporated - San Diego CA
International Classification:
H04Q 7/00
US Classification:
370329, 370208, 370310
Abstract:
Techniques to more efficiently transmit pilot and signaling on the uplink in an OFDM system. With subband multiplexing, M usable subbands in the system are partitioned into Q disjoint groups of subbands. Each subband group may be assigned to a different terminal for uplink pilot transmission. Multiple terminals may transmit simultaneously on their assigned subbands. The transmit power for the pilot may be scaled higher to attain the same total pilot energy even though S instead of M subbands are used for pilot transmission by each terminal. Pilot transmissions from the terminals are received, and a channel estimate is derived for each terminal based on the pilot received on the assigned subbands. The channel estimate comprises a response for additional subbands not included in the assigned group. Subband multiplexing may also be used for uplink signaling transmission.
Control profile
Rajiv N Vijayan from Del Mar, CA, age ~60 Get Report