Bishwarup Mondal

US Patent:

7778343, Aug 17, 2010

Filed:

Jan 26, 2007

Appl. No.:

11/627563

Inventors:

William J. Hillery - Hoffman Estates IL, US
Thomas P. Krauss - Algonquin IL, US
Bishwarup Mondal - Rolling Meadows IL, US
Timothy A. Thomas - Palatine IL, US
Frederick W. Vook - Schaumburg IL, US

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 7/02
H04L 1/02

US Classification:

375267, 375260, 370339

Abstract:

A generalized form of cyclic shift diversity is described for use in an OFDM system with multiple transmit antennas. Multiple cyclic shifts are performed for each transmit antenna and the shifted signals are scaled and summed to form a time-domain data stream for each transmit antenna. A cyclic extension is added to each data stream prior to transmission.

US Patent:

8107544, Jan 31, 2012

Filed:

Apr 1, 2008

Appl. No.:

12/060301

Inventors:

Bishwarup Mondal - Rolling Meadows IL, US
Robert M. Harrison - Grapevine TX, US
Timothy A. Thomas - Palatine IL, US

Assignee:

Motorola Mobility, Inc. - Libertyville IL

International Classification:

H04K 1/10

US Classification:

375260, 375262, 375267, 375295, 375316, 375346, 375347, 375349

Abstract:

A method an apparatus is described for providing feedback for closed-loop transmitting with multiple transmit and receive antennas. The method includes a first step of providing a codebook containing sets of weightings for each data stream of the multiple transmit antennas with each set identified by an index known to a transmitter and a receiver. The same codebook is utilized for any number of data streams up to the number of transmit antennas. A next step includes measuring a composite channel between the transmitter and receiver. A next step includes determining at least one performance metric for each set of weightings in the codebook. A next step includes selecting preferred weightings for each data stream in response to the performance metrics. A next step includes feeding back an index of the preferred weightings to the transmitter for use in subsequent transmissions.

US Patent:

8194762, Jun 5, 2012

Filed:

Aug 19, 2008

Appl. No.:

12/193820

Inventors:

Bishwarup Mondal - Schaumburg IL, US
Amitabha Ghosh - Buffalo Grove IL, US
Fan Wang - Chicago IL, US

Assignee:

Motorola Mobility, Inc. - Libertyville IL

International Classification:

H04K 1/10

US Classification:

375260, 375267, 375263, 375264, 375299, 455500, 455 69, 455512, 455524, 455 59, 455517, 455526, 455101, 455103, 455105

Abstract:

An apparatus and method to feedforward non-quantized precoding weights in an OFDM communication system includes a first step () of sending feedback information from a subscriber station (SS) to a base station (BS). A next step () includes deriving non-quantized weight information from the feedback information. A next step () includes transmitting symbols carrying the non-quantized weight information and non-precoded pilot symbols by the BS. A next step () includes receiving the information and symbols by the SS. A next step () includes estimating the non-quantized weights from the symbols carrying the non-quantized weight information and the non-precoded pilot symbols by the SS. A next step () includes decoding data from the BS by the SS using the estimated non-quantized weight information.

US Patent:

8204014, Jun 19, 2012

Filed:

Mar 17, 2009

Appl. No.:

12/405307

Inventors:

Bishwarup Mondal - Oak Park IL, US
Kevin L. Baum - Rolling Meadows IL, US
Amitabha Ghosh - Buffalo Grove IL, US
Timothy Thomas - Palatine IL, US
Frederick Vook - Schaumburg IL, US
Fan Wang - Chicago IL, US

Assignee:

Motorola Mobility, Inc. - Libertyville IL

International Classification:

H04W 4/00
H04L 1/00
H04L 12/26

US Classification:

370329, 370252

Abstract:

A method and system that enables the usage of sounding-based feedback or analog feedback in a MIMO communication system with non-beamformed or broadcast pilot symbols is disclosed. The mobile station may employ a feedback channel to send a sounding waveform to a base station, a feedforward channel to receive from the base station codebook weights derived from the send sounding waveform, a receiver to receive communication from the base station, and a processor to detect beamformed data from the received communication and received codebook weights from the base station. The base station processes the sounding waveform to determine codebook weights on groups of subcarriers. Additionally, the base station transmits the beamformed payload and broadcast pilots to the mobile station.

US Patent:

8243678, Aug 14, 2012

Filed:

Feb 6, 2009

Appl. No.:

12/367473

Inventors:

Mark C Cudak - Rolling Meadows IL, US
Amitabha Ghosh - Buffalo Grove IL, US
Bishwarup Mondal - Schaumburg IL, US
Anup K Talukdar - Dekalb IL, US
Timothy A Thomas - Palatine IL, US
Frederick W Vook - Schaumburg IL, US
Fan Wang - Chicago IL, US
Xiangyang Zhuang - Lake Zurich IL, US

Assignee:

Motorola Mobility, Inc. - Libertyville IL

International Classification:

H04W 4/00

US Classification:

370330

Abstract:

A method for communicating control channel information in a wireless communication system, including transmitting a super-frame having a time-frequency resource region containing an allocation control channel and multiple pilot elements, at least some of which are associated with the allocation control channel, and indicating, in a configuration information control channel of the super-frame, a characteristic of the pilots elements associated with the allocation control channel.

US Patent:

8351544, Jan 8, 2013

Filed:

Dec 15, 2008

Appl. No.:

12/334917

Inventors:

Bishwarup Mondal - Oak Park IL, US
Amitabha Ghosh - Buffalo Grove IL, US
Fan Wang - Chicago IL, US

Assignee:

Motorola Mobility LLC - Libertyville IL

International Classification:

H04L 27/00

US Classification:

375299, 375267, 375347, 455101

Abstract:

A method and apparatus are provided for feedback for closed-loop transmitting with multiple transmit antenna elements and multiple receive antenna elements. A base station includes a codebook containing sets of weightings for the multiple transmit antenna elements, with each set of weightings identified by an index and the codebook known to the base station and a served mobile station (MS). The base station pre-codes pilot signals using a precoding matrix, preferably a unitary matrix, to produce pre-coded pilot signals, which precoding matrix may or may not be known to the MS and which precoding matrix may or may not be included in the codebook. The base station then transmits the pre-coded pilot signals to the MS via the multiple transmit antenna elements and, in response, receives an index to a set of weightings in the codebook for use in a subsequent transmission of a data stream.

US Patent:

8391173, Mar 5, 2013

Filed:

May 10, 2010

Appl. No.:

12/776499

Inventors:

Mark C. Cudak - Rolling Meadows IL, US
Amitabha Ghosh - Buffalo Grove IL, US
William J. Hillery - Hoffman Estates IL, US
Bishwarup Mondal - Oak Park IL, US
Anup K. Talukdar - Dekalb IL, US
Eugene Visotsky - Buffalo Grove IL, US
Frederick W. Vook - Schaumburg IL, US
Fan Wang - Chicago IL, US

Assignee:

Motorola Mobility LLC - Libertyville IL

International Classification:

H04W 4/00

US Classification:

370252, 370329, 370341

Abstract:

In an OFDM communication system, wherein a frequency bandwidth is divided into multiple Physical Resource Units (PRUs), a Frequency Partitioning Configuration Module (FPCM) is provided that configures a physical layer for use in multiple coverage areas. The FPCM divides the PRUs into a first group, for frequency selective allocations, and a second group, for frequency diverse allocations. The FPCM subdivides each of the two groups into multiple sets of PRUs, maps the sets of PRUs from the first group to consecutive PRUs allocated for contiguous segment allocation (CS-PRUs), and maps the sets of PRUs from the second group to consecutive PRUs allocated for distributed segment allocation (DS-PRUs). The FPCM permutes the DS-PRUs and allocates the CS-PRUs and the permuted DS-PRUs to at least one frequency partition.

US Patent:

8396162, Mar 12, 2013

Filed:

Nov 3, 2008

Appl. No.:

12/263590

Inventors:

Timothy A. Thomas - Palatine IL, US
Amitabha Ghosh - Buffalo Grove IL, US
Bishwarup Mondal - Rolling Meadows IL, US

Assignee:

Motorola Mobility LLC - Libertyville IL

International Classification:

H04L 25/03

US Classification:

375296, 375262, 375260, 375267, 375295, 375259, 375261

Abstract:

A method and apparatus for choosing a modulation and coding rate in a MU-MIMO communication system is provided herein. During operation, a node will determine the MCR to feed back to the base even though the mobile does not know which of the possible interferers (if any) will be using the same time/frequency resources as the mobile. This takes place via the mobile node calculating best antenna weights (codebook choice) for each group of subcarriers that can be potentially used by the mobile. Transmit weights v for each interferer are then determined and the weights are utilized to determine a best modulation and coding rate for the mobile.