James V Krogmeier

US Patent:

8107397, Jan 31, 2012

Filed:

Jun 5, 2007

Appl. No.:

11/758636

Inventors:

Saurabh Bagchi - West Lafayette IN, US
Ness B. Shroff - West Dublin OH, US
Issa M. I. Khalil - Al Ain, AE
Rajesh K. Panta - West Lafayette IN, US
Mark D. Krasniewski - Austin TX, US
James V. Krogmeier - West Lafayette IN, US

Assignee:

Purdue Research Foundation - West Lafayette IN

International Classification:

H04L 12/28

US Classification:

370254, 717177, 380278

Abstract:

A protocol for optimizing the energy for code upload to sensors in a wireless sensor network and speeding up the dissemination if multiple sources of code are available. Energy optimization is achieved by equipping each node with limited non-local topology information, which it uses to determine the time when it can go to sleep since code is not being distributed in its vicinity. Another aspect of the invention is a protocol that facilitates secure upload of code in the wireless sensor network. The secure communication protocol divides the sensor field into control groups each with a control node, and manages data exchange between nodes within a control group through the mediation of a control head which provides the common key. The keys are refreshed periodically and the control nodes are changed periodically to enhance security. The protocol facilitates secure communication between sensor nodes despite the compromise of any number of other nodes in the network.

US Patent:

8254482, Aug 28, 2012

Filed:

May 13, 2008

Appl. No.:

12/120212

Inventors:

Jung Hoon Suh - Yongin-si, KR
Sung Jin Kim - Suwon-si, KR
David J. Love - West Lafayette IN, US
James V. Krogmeier - West Lafayette IN, US

Assignee:

Samsung Electronics Co., Ltd. - Suwon-si
Purdue Research Foundation - West Lafayette IN

International Classification:

H04L 5/12

US Classification:

375261, 375346

Abstract:

A decoder adopted to receive a signal transmitted in a communication system, includes one or more of a module adopted to pre-process a received signal to reduce the effect of interference-plus-noise on the received signal before filtering the received signal, and a module adopted to post-process the result of filtering the received signal.

US Patent:

20030156660, Aug 21, 2003

Filed:

May 8, 2002

Appl. No.:

10/140677

Inventors:

Michael Zoltowski - West Lafayette IN, US
Gregory Tomezak - Waterford MI, US
James Krogmeier - West Lafayette IN, US
Chandra Mohan - Carmel IN, US
Zhiming Zhang - Indianapolis IN, US

International Classification:

H03C001/52
H04L027/04

US Classification:

375/301000

Abstract:

Variable Aperture Coded (VAC) signals for VAC modulation are advantageously generated by a digital signal processor () that yields a VAC signal having a single narrow in the positive frequency region. A Discrete-Time Hilbert transformer () isolates the only the positive spectral peaks, thus yielding a VAC signal that affords greater control over zero crossings.

US Patent:

20130229309, Sep 5, 2013

Filed:

Mar 1, 2012

Appl. No.:

13/409441

Inventors:

Timothy THOMAS - Palatine IL, US
Sooyoung HUR - West Lafayette IN, US
Taejoon KIM - Berkeley CA, US
David J. LOVE - West Lafayette IN, US
James V. KROGMEIER - West Lafayette IN, US

International Classification:

H01Q 3/00

US Classification:

342377, 342368

Abstract:

A method includes transmitting a training signal from each of N omni-directional beams corresponding to N entries in an omni-directional codebook, receiving feedback including indication(s) corresponding to an entry from a narrow beam codebook entry to use to transmit, determining, based on the indication(s), the entry from a narrow beam codebook entry to use to transmit, and transmitting a data signal using the entry from the narrow beam codebook. Another method includes receiving at a receiver a training signal including N omni-directional beams corresponding to N entries in an omni-directional codebook, determining a best entry from a narrow beam codebook to use by a transmitter in transmissions to the receiver, where the best entry is determined as a function of the received training signal including the N omni-directional beams, and transmitting to the transmitter indication(s) corresponding to the best entry of the narrow beam codebook.