Lawrence E Downing

from Chicago, IL

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Transmission Technique Selector For Radio Communication Systems With Multiple Transmit And Multiple Receive Antennas
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US Patent:

7477699, Jan 13, 2009
Filed:

Dec 20, 2006
Appl. No.:

11/613349
Inventors:

Fan Wang - Chicago IL, US
Lawrence A. Downing - Hoffman Estates IL, US
Amitava Ghosh - Buffalo Grove IL, US
Chandrasekar Sankaran - Arlington Heights IL, US
Jun Tan - Lake Zurich IL, US
Assignee:

Motorola, Inc. - Schaumburg IL
International Classification:

H04B 7/02
H04L 1/02
US Classification:

375267, 375260, 375299, 375347, 455101, 455103, 455 69, 455104
Abstract:

A radio communications device () that has multiple receive antennas processes received data communications signals to select between space time coding and spatial multiplexing as a selected transmission technique from a base device () that has multiple transmit antennas. A channel throughput (--) for each transmission technique is estimated based on signal to interference and noise ratios (--) of signals being transmitted through a MIMO channel () as measured by a receiver (). The transmission technique with the higher estimated throughput is determined. If spatial multiplexing is determined to have the higher estimated throughput and the throughput of each layer of the spatially multiplexed signal is greater than a threshold, spatial multiplexing is selected. Otherwise, space time coding is selected.

Method And System For Operating A Wireless Device With A Radio Frequency Identification Tag
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US Patent:

20060232437, Oct 19, 2006
Filed:

Apr 14, 2005
Appl. No.:

11/106099
Inventors:

Gerald Gutowski - Glenview IL, US
Stanley Benes - Round Lake Beach IL, US
Lawrence Downing - Hoffman Estates IL, US
International Classification:

H04B 1/00
G05B 19/00
US Classification:

340825690, 340005740, 340010100
Abstract:

A wireless device () having a Radio Frequency Identification (RFID) tag () and method to operate the wireless device are disclosed. The wireless device includes a switching circuit () coupled to the RFID tag. After an RFID signal is received (), a switching circuit controls a power state of the wireless device according to the RFID signal (). After the wireless device is on, the RFID signal may direct the wireless device to send information regarding the identity of the wireless device (), authenticate the identity of the wireless device (), scan for available wireless communication systems (), and send information regarding the location and power status of the wireless device () using one or more of the available wireless communication systems.