Skylark Wl Holdings, LLC

Other

Deutschetelekom Ag

William Marsh Rice University

Anand, Narendra

Shepard, Clayton, W.

Zhong, Lin

Knightly, Edward

Guerra, Ryan, E.

Skylark Wireless, LLC

Clayton Wells Shepard

Lin Zhong

Hang Yu

Abeer Javed

Ashutosh Sabharwal

Jatinder Pal Singh

Edward Knightly

Narendra Anand

Angela Nicoara

Ryan E Guerra

Evan J Everett

Ahmad Rahmati

Base stations for MIMO wireless systems embodying efficient channel estimation techniques. One illustrative embodiment includes: an array of multiple antennas to exchange uplink and downlink signals with spatially-distributed user terminals; multiple transmit chains, each coupled to one of the multiple antennas by a respective transceiver that also couples that antenna to a respective one of multiple receive chains; and a controller. Each of the receive chains opportunistically derives estimated uplink channel response coefficients from packet headers in the wireless uplink signals, and the controller determines a steering transform based at least in part on the estimated channel response coefficients. The transmit chains apply the steering transform to spatially-distinct downlink signals to produce antenna-specific downlink signals for each antenna in the array. Another illustrative embodiment determines, based at least in part on the estimated channel response coefficients, a mobility indicator for each user terminal, and, based on the mobility indicators, schedules at least one action.

Efficient channel estimation for implicit MU-MIMO

Disclosed embodiments include methods for control channel design in many-antenna multi-user (MU) multiple-input multiple-output (MIMO) wireless systems. A beacon comprising an identifier of a many-antenna base station is encoded into a base sequence. A plurality of synchronization sequences is generated based on the encoded base sequence and a set of orthogonal beam sequences. The many-antenna base-station transmits, using a plurality of antennas, the plurality of synchronization sequences in a plurality of beam directions associated with the set of orthogonal beam sequences for synchronization and associated with users without knowledge of channel state information (CSI).

Control channel design for many-antenna MU-MIMO systems

Technique for full-duplex transmission in many-antenna multi-user (MU) multiple-input multiple-output (MIMO) systems is presented in this disclosure. An estimate of a self-interference channel between a plurality of transmit antennas and a plurality of receive antennas is first obtained. A precoder for self-interference reduction is generated based on minimizing a self-interference power related to the self-interference channel that is present at the plurality of receive antennas. Transmission data are modified using the precoder by projecting the transmission data onto a defined number of singular vectors of the self-interference channel that correspond to the defined number of smallest singular values of the self-interference channel. Data are received in full-duplex mode via the plurality of receive antennas simultaneously with transmitting the modified transmission data.

Technique for full-duplex transmission in many-antenna MU-MIMO systems

A method for managing TCP flows in a mobile device adapted to connect to two or more wireless network types includes enabling connection to a number of networks of different types at the mobile device and executing a plurality of Internet-enabled applications on the mobile device. Each such application forms an existing TCP connection over a first one of the wireless networks. The routing table is modified such that any additional TCP connection will be created on a second one of the wireless networks. The device determines that a termination condition has occurred and in response to determining that the termination condition has occurred, renders an interface on the mobile device to the first one of the wireless networks inoperative.

Heterogeneous network access on devices with one or more network interfaces

Growing community of inventors

Houston, TX, United States of America

Clayton Wells Shepard