Alexei Y Gorokhov from 12407 Ragweed St, San Diego, CA 92129, age 53, Phone: (858)2406302

Wikipedia

Alexei Gorokhov

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Aleksey Nikolaevich Gorokhov (Russian: ; Ukrainian: ; February 11, 1927, Moscow - February 3, ...

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Alexei Gorokhov

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Us Patents

Reception Of H-Arq Transmissions With Interference Cancellation In A Quasi-Orthogonal Communication System
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US Patent:

7554948, Jun 30, 2009
Filed:

Jun 7, 2005
Appl. No.:

11/147830
Inventors:

Ayman Fawzy Naguib - Cupertino CA, US
Alexei Gorokhov - San Diego CA, US
Dhananjay Gore - San Diego CA, US
Tingfang Ji - San Diego CA, US
Arak Sutivong - San Diego CA, US
Assignee:

QUALCOMM, Incorporated - San Diego CA
International Classification:

H04W 4/00
US Classification:

370330, 370319, 370349
Abstract:

To receive packets with interference cancellation, block transmissions for the packets are received on time-frequency blocks used by these packets. Receiver spatial processing is performed on input symbols to obtain detected symbols. Each packet is demodulated and decoded based on all detected symbols obtained for all block transmissions received for the packet. For each packet that is decoded correctly, the transmission for the packet is terminated, the interference due to the packet is estimated, and the estimated interference is subtracted from the input symbols for all time-frequency blocks used by the packet. Receiver spatial processing is performed on the interference-canceled symbols to obtain new detected symbols for all time-frequency blocks used by all correctly decoded packets. Each packet decoded in error and overlapping at least partially with any correctly decoded packet may be demodulated and decoded based on all detected symbols available for that packet.

Frequency Domain Filtering To Improve Channel Estimation In Multicarrier Systems
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US Patent:

7616711, Nov 10, 2009
Filed:

Dec 22, 2004
Appl. No.:

11/022360
Inventors:

Dhananjay Ashok Gore - San Diego CA, US
Avneesh Agrawal - San Diego CA, US
Aamod Khandekar - San Diego CA, US
Alexei Gorokhov - San Diego CA, US
Assignee:

QUALCOMM Incorporated - San Diego CA
International Classification:

H03D 1/00
H04L 27/06
US Classification:

375340, 375224, 375285, 375296, 375350
Abstract:

A channel estimation system comprises a filtering component that selectively scales a plurality of carriers as a function of location of the plurality of carriers within a frequency band, wherein the plurality of carriers comprises at least one data carrier and at least one pilot carrier. A component thereafter extrapolates an observation from the at least one pilot carrier, wherein a channel is estimated as a function of the extrapolated observation. The scaling of the carriers facilitates reducing a flooring effect associated with channel estimation. The filtering component can be employed at a transmitter and/or at a receiver, and can be activated and/or deactivated as a function of a sensed data packet type.

On-Demand Reverse-Link Pilot Transmission
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US Patent:

7706324, Apr 27, 2010
Filed:

May 13, 2005
Appl. No.:

11/129636
Inventors:

Arak Sutivong - Bangkok, TH
Avneesh Agrawal - San Diego CA, US
Alexei Gorokhov - San Diego CA, US
Edward Harrison Teague - San Diego CA, US
Assignee:

QUALCOMM Incorporated - San Diego CA
International Classification:

H04J 11/00
H04J 4/00
H04J 3/16
H04W 4/00
H04B 7/00
H04B 7/212
US Classification:

370330, 370203, 370277, 370436, 370437, 370442
Abstract:

Pilots are transmitted on demand on a reverse link and used for channel estimation and data transmission on a forward link. A base station selects at least one terminal for on-demand pilot transmission on the reverse link. Each selected terminal is a candidate for receiving data transmission on the forward link. The base station assigns each selected terminal with a time-frequency allocation, which may be for a wideband pilot, a narrowband pilot, or some other type of pilot. The base station receives and processes on-demand pilot transmission from each selected terminal and derives a channel estimate for the terminal based on the received pilot transmission. The base station may schedule terminals for data transmission on the forward link based on the channel estimates for all selected terminals. The base station may also process data (e. g. , perform beamforming or eigensteering) for transmission to each scheduled terminal based on its channel estimate.

Methods And Apparatus For Flexible Spectrum Allocation In Communication Systems
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US Patent:

7706350, Apr 27, 2010
Filed:

Dec 22, 2004
Appl. No.:

11/022514
Inventors:

Alexei Gorokhov - San Diego CA, US
Avneesh Agrawal - San Diego CA, US
Assignee:

QUALCOMM Incorporated - San Diego CA
International Classification:

H04B 7/208
US Classification:

370344, 370208, 370 691, 455 631, 455446, 455450, 4554521, 455453, 455454
Abstract:

The disclosed embodiments provide for methods and systems for flexibly allocating a shared frequency spectrum to a plurality of users, the spectrum may have a first number of segments, each segment having a second number of clusters associated with a certain sector/cell. In one aspect, a method for flexibly allocating a shared frequency spectrum to a plurality of users comprises the acts of fixedly assigning a first group of clusters to a first group of users, such that the first group of users stay fixed to the assigned clusters, and assigning a second group of clusters to a second group of users, such that the second group of users hop within the assigned clusters.

Simplified Channel And Interference Estimation With Dedicated Pilot Tones For Ofdma
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US Patent:

7751510, Jul 6, 2010
Filed:

Jul 25, 2006
Appl. No.:

11/493643
Inventors:

Petru Cristian Budianu - San Diego CA, US
Dhananjay Ashok Gore - San Diego CA, US
Alexei Gorokhov - San Diego CA, US
Assignee:

Qualcomm Incorporated - San Diego CA
International Classification:

H03D 1/04
H04B 1/10
US Classification:

375346, 370203
Abstract:

Estimation of channel characteristics and interference level in a time-varying multi-carrier multi-user systems is carried out concurrently. To perform the estimation, a multitude of data symbols and dedicated pilot symbols are transmitted over the channel. The estimate of the interference level is used to estimate the channel parameters.

Separating Pilot Signatures In A Frequency Hopping Ofdm System By Selecting Pilot Symbols At Least Hop Away From An Edge Of A Hop Region
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US Patent:

7768979, Aug 3, 2010
Filed:

May 18, 2005
Appl. No.:

11/132765
Inventors:

Arak Sutivong - Bangkok, TH
Ayman Fawzy Naguib - Cupertino CA, US
Dhananjay Gore - San Diego CA, US
Alexei Gorokhov - San Diego CA, US
Tingfang Ji - San Diego CA, US
Assignee:

QUALCOMM Incorporated - San Diego CA
International Classification:

H04W 4/00
US Classification:

370334, 375132, 455450
Abstract:

Transmission patterns for pilot symbols transmitted from a mobile station or base station are provided. The patterns may be selected according to a location of the mobile station with respect to one or more antennas are provided. In some aspects, the pattern may be selected based upon the distance between the mobile station and the one or more antennas. In other aspect, the pattern may be based upon whether the mobile station is in handoff.

Rate Selection For A Quasi-Orthogonal Communication System
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US Patent:

7809336, Oct 5, 2010
Filed:

Jun 10, 2005
Appl. No.:

11/150417
Inventors:

Ayman Fawzy Naguib - Cupertino CA, US
Alexei Gorokhov - San Diego CA, US
Tingfang Ji - San Diego CA, US
Dhananjay Gore - San Diego CA, US
Arak Sutivong - San Diego CA, US
Assignee:

Qualcomm Incorporated - San Diego CA
International Classification:

H04B 1/00
H04B 7/00
US Classification:

455 69, 455 631, 455 6711, 455 6713, 455450, 4554521, 4555621, 370431, 370277, 370208, 370252, 375227, 375267, 375347, 375144
Abstract:

To select a rate for a transmitter in a communication system, a receiver obtains a channel response estimate and a received SINR estimate for the transmitter, e. g. , based on a pilot received from the transmitter. The receiver computes a hypothesized SINR for the transmitter based on the channel response estimate and the received SINR estimate. The receiver then selects a rate for the transmitter based on (1) the hypothesized SINR and (2) characterized statistics of noise and interference at the receiver for the transmitter, which may be given by a probability density function (PDF) of SINR loss with respect to the hypothesized SINR. A look-up table of rate versus hypothesized SINR may be generated a priori for the PDF of SINR loss. The receiver may then apply the hypothesized SINR for the transmitter to the look-up table, which then provides the rate for the transmitter.

Channel Tracking With Scattered Pilots
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US Patent:

7817732, Oct 19, 2010
Filed:

Jul 14, 2005
Appl. No.:

11/182089
Inventors:

Alexei Gorokhov - San Diego CA, US
Assignee:

Qualcomm Incorporated - San Diego CA
International Classification:

H04L 27/28
US Classification:

375260, 375346
Abstract:

According to the disclosure, a system adapted to estimate and track a channel for wireless orthogonal frequency division modulation (OFDM) communication is disclosed. The system utilizes scattered pilot symbols being subject to channel conditions and estimates the channel value using the plurality of received pilot symbols and in accordance with correlation of the channel conditions over time.