1
Genyuan Wang, Ahmadreza Hedayat, Hanqing Lou, Hang Jin: Method and system for selecting a transmission scheme in a multiple-input-multiple-output wireless communications system. Cisco Technology, April 3, 2012: US08149942 (11 worldwide citation)

The present invention discloses a method for selecting a transmission scheme in a multiple-input-multiple-output (MIMO) wireless communications system. The method comprises receiving a downlink request to transmit a data stream to a wireless station, checking the availability of channel state inform ...


2
Ahmadreza Hedayat, Hang Jin: Method for computing a downlink beamforming weighting vector based on up link channel information. Cisco Technology, August 17, 2010: US07778211 (9 worldwide citation)

Described herein is a method for obtaining a downlink beamforming weighting vector in a wireless communications system based on channel information about an uplink channel. The method comprises obtaining the channel information about the uplink channel by a means selected from the group comprising o ...


3
Hang Jin, Ahmadreza Hedayat, John Grabner: Method and system for creating beamformed channels in a multi-input multi-output network. Cisco Technology, November 17, 2009: US07620423 (9 worldwide citation)

The present invention discloses a method and system for signal communication in a multi-input multi-output network. The method creates beamformed channels by calculating one or more beamforming weighting vectors corresponding to one or more antennas on the receiving wireless station based on the pre ...


4
Genyuan Wang, Hang Jin, Hanqing Lou, Ahmadreza Hedayat: Method and system for achieving spatial diversity of a wireless communications network. Cisco Technology, Edell Shapiro & Finnan, November 29, 2011: US08068552 (8 worldwide citation)

A method and system are provided for achieving spatial diversity of a wireless communications network. The method comprises arranging antennas on a transmitting wireless station into a plurality of antenna subgroups, wherein each of the antenna subgroups forms a virtual antenna, creating a plurality ...


5
Hang Jin, Ahmadreza Hedayat, George Bednekoff, Mitch Johnson, Wenhua Zhou, John Grabner: Wireless communications system with reduced sideband noise and carrier leakage. Cisco Technology, June 8, 2010: US07733949 (7 worldwide citation)

A wireless communications system is provided with reduced sideband noise and carrier leakage. In the system, at least one transmitter modulates at least one input signal with a first carrier to generate a modulated output signal, and at least one receiver receives the modulated output signal and dem ...


6
Ahmadreza Hedayat, Brian D Hart: Medium reservation techniques for multi-user transmissions. Cisco Technology, Edell Shapiro & Finnan, May 28, 2013: US08451771 (5 worldwide citation)

Techniques are provided for a multi-user reservation sequence used when transmitting a multi-user transmission in a wireless network. At a wireless access point device configured to operate in a wireless network, a multi-user request-to-send packet is transmitted as part of a multi-user reservation ...


7
Ahmadreza Hedayat, Hanqing Lou, Hang Jin: Method and system for improving decoding efficiency in wireless receivers. Cisco Technology, Edell Shapiro & Finnan, January 20, 2009: US07480852 (4 worldwide citation)

Techniques are provided herein to improve the decoding efficiency in a wireless receiver to obtain a correctly decoded data string. A state metric matrix from a received codeword is used to generate active state metric matrices for time instances of the received codeword, and then a differential met ...


8
Ahmadreza Hedayat, Genyuan Wang, Hang Jin, Hanqing Lou: Generalized MIMO-beamforming weight estimation. Cisco Technology, Edell Shapiro & Finnan, February 14, 2012: US08116698 (3 worldwide citation)

Techniques are provided to enable wireless communication between first and second wireless communication devices each having a plurality of antennas, where the second device sends the transmissions via less than all of its plurality of antennas. Each transmission may comprise a plurality of time-fre ...


9
Hanqing Lou, Ahmadreza Hedayat, Hang Jin: Method for retransmitting a data sequence according to channel condition in a wireless communications network. Cisco Technology, May 15, 2012: US08181076 (3 worldwide citation)

Retransmitting a data sequence over a wireless network according to channel conditions proceeds by transmitting a first transmitting signal representing the data using a first set of beamforming weighting vectors generated according to a first channel condition. A request for re-transmitting the dat ...


10
Genyuan Wang, Li Guo, Ahmadreza Hedayat, Hang Jin: Beamforming weight estimation using wideband multipath direction of arrival analysis. Cisco Technology, Edell Shapiro & Finnan, July 23, 2013: US08494073 (3 worldwide citation)

Techniques are provided for computing downlink beamforming weights based on the received data at a base station from a mobile station in a MIMO communication system. An uplink transmission is received at a plurality of antennas at a first communication device from a second communication device, wher ...