Rahul Tandra

20110310870, Dec 22, 2011

Jun 20, 2011

13/164514

Didier Johannes Richard Van Nee - De Meern, NL
Hemanth Sampath - San Diego CA, US
Sameer Vermani - San Diego CA, US
Rahul Tandra - San Diego CA, US
Albert Van Zelst - Woerden, NL

QUALCOMM INCORPORATED - San Diego CA

H04L 27/06
H04W 4/00
H04L 27/00

370338, 375295, 375316, 375340, 375341

In a downlink multi-user multiple input multiple output (DL MU-MIMO) system, channel state information (CSI) feedback duration may strongly affect media access control (MAC) efficiency. While a time domain compression may give a significant reduction in feedback duration, the time domain compression may have complexity issues at the station (STA). In particular, for time domain compression, a large complex matrix multiplication may be required at the client to estimate a cyclic prefix (CP) length impulse response, which best models the frequency response of the channel. Embodiments of the invention comprise a hybrid scheme that may reduce the above complexity while maintaining significant compression gains.

20120058735, Mar 8, 2012

Sep 7, 2011

13/227185

Sameer Vermani - San Diego CA, US
Rahul Tandra - San Diego CA, US
Albert Van Zelst - Woerden, NL
Didier Johannes Richard Van Nee - De Meern, NL
Hemanth Sampath - San Diego CA, US

QUALCOMM INCORPORATED - San Diego CA

H04B 7/00

455 69

Certain aspects of the present disclosure relate to techniques for transmitting sounding feedback in Very High Throughput (VHT) wireless systems. The sounding feedback may be transmitted from a user station (STA), wherein the feedback may comprise a certain number of beamforming matrices and a certain number of singular values of a wireless channel associated with the STA. Further, the sounding feedback may comprise a bit for indicating whether this feedback represents a Single-User (SU) feedback or a Multi-User (MU) feedback.

20120082193, Apr 5, 2012

Oct 4, 2011

13/252941

Albert Van Zelst - Woerden, NL
Sameer Vermani - San Diego CA, US
Rahul Tandra - San Diego CA, US

QUALCOMM INCORPORATED - San Diego CA

H04B 1/38

375219

Beamforming may be used in MIMO communication systems to further enhance spectral efficiency. Beamforming refers to beamed transmissions to a single destination (e.g., a station) at a time, to enhance the rate and/or range of transmission. To perform beamforming from a source to one or more destinations, a channel and/or beamforming matrices corresponding to the channel needs to be known at the source, which may be obtained as feedback from the destination. However, the beamforming matrices may not be smooth over frequency as it is fed back from the destination. Therefore, certain aspects of the present disclosure provide beamforming feedback options, resulting in the smoothness of the channel or a beamforming matrix corresponding to the channel.

20120115536, May 10, 2012

Nov 7, 2011

13/290864

Sameer Vermani - San Diego CA, US
Rahul Tandra - San Diego CA, US
Santosh Paul Abraham - San Diego CA, US
Hemanth Sampath - San Diego CA, US

QUALCOMM INCORPORATED - San Diego CA

H04W 52/04

455522

Certain aspects of the present disclosure provide techniques and apparatus for using power control in a television white space (TVWS) network. One example method generally includes generating, at a first apparatus, a message for controlling a transmit power of a second apparatus—the message including a first indication of a first transmitter power backoff for the first apparatus and a second indication of a second transmitter power backoff for the second apparatus—and transmitting, to the second apparatus, the message based on the first transmitter power backoff. In this manner, messaging may be used to enable transmit power control of devices in a TVWS network, which may operate in accordance with the IEEE 802.11af standard.

20120117446, May 10, 2012

Mar 8, 2011

13/043259

Mohammad Hossein Taghavi Nasrabadi - San Diego CA, US
Hemanth Sampath - San Diego CA, US
Simone Merlin - San Diego CA, US
Santosh P. Abraham - San Diego CA, US
Sameer Vermani - San Diego CA, US
Rahul Tandra - San Diego CA, US

QUALCOMM, Incorporated - San Diego CA

H03M 13/05
G06F 11/10

714776, 714E11032

In a first aspect, an aggregated packet (A-MPDU) includes packets (MPDUs) and EC-Blocks (Error Correction Blocks) containing error correction coding information. A transmitter uses a Fountain coding scheme (for example, Raptor or RaptorQ) to generate the error correction coding information from the MPDUs. If a receiver detects an error in a received MPDU, then the receiver uses the error correction coding information from the EC-Blocks to correct the error. In a second novel aspect, a determination is made as to whether a change in error rate is more likely due to collisions or to a low SNR. If the determination is that the change is due to collisions then the MCS index is adjusted to restore a target error rate, whereas if the determination is that the change is due to a low SNR then the number of EC-Blocks per A-MPDU is adjusted to restore the target error rate.

20120120931, May 17, 2012

May 13, 2011

13/107017

Santosh Paul Abraham - San Diego CA, US
Sameer Vermani - San Diego CA, US
Maarten Menzo Wentink - Naarden, NL
Rahul Tandra - San Diego CA, US
Hemanth Sampath - San Diego CA, US

QUALCOMM Incorporated - San Diego CA

H04W 84/12

370338

Certain aspects of the present disclosure provide techniques and apparatus for efficiently managing overloaded group IDs for groups of stations (STAs) receiving simultaneous transmission in a multiuser multiple-input multiple-output (MU-MIMO) scheme. In this manner, overloading for some of the groups may allow flexibility at an access point (AP) to trade off between support for more STA combinations and power savings. As disclosed herein, the group ID management scheme may be flexible enough to support APs with both overloaded and non-overloaded groups and APs with only non-overloaded groups. This scheme also achieves these benefits for overloading with a low overhead.

20120122477, May 17, 2012

Nov 14, 2011

13/296071

Ahmed K. Sadek - San Diego CA, US
Rahul Tandra - San Diego CA, US
Alan Barbieri - San Diego CA, US
Ravi Palanki - San Diego CA, US

QUALCOMM Incorporated - San Diego CA

H04W 24/00

4554561

There lies a challenge to develop a technique of accurately and efficiently determining an available communication channel. In accordance with some embodiments disclosed herein, techniques for sensing a primary user of a particular communication channel are performed more efficiently. In some implementations, a geo-location of a communication device is combined with a sensing algorithm in order to more efficiently perform spectrum sensing. In some implementations, a geo-location and an accuracy determination may be used to determine all required sample regions in order to ensure that a primary user is not present in a particular location.

20120238226, Sep 20, 2012

Feb 17, 2012

13/398842

Sameer Vermani - San Diego CA, US
Santosh Paul Abraham - San Diego CA, US
Vincent Knowles Jones - Redwood City CA, US
Stephen J. Shellhammer - Ramona CA, US
Didier Johannes Richard Van Nee - De Meern, NL
Albert van Zelst - Woerden, NL
Rahul Tandra - San Diego CA, US

QUALCOMM INCORPORATED - San Diego CA

H04B 1/04
H04B 1/16

455118, 455313

Methods, systems, and/or devices are provided that permit data transmissions over unused television channels. An unused channel within a television broadcast frequency spectrum is first identified. A downclocked waveform (for data transmission) is then generated by applying a factor to a clock that causes a waveform bandwidth to be reduced from a first bandwidth to a second bandwidth, wherein the second bandwidth of the downclocked waveform is less than a channel bandwidth for the identified unused channel. The downclocked waveform may then be configured so that it coexists with a larger waveform having a third bandwidth that is greater than the channel bandwidth. The downclocked waveform is then wirelessly transmitted from the transmitter device over the identified unused channel.