Qualcomm Incorporated

John Wendell Ketchum

Mark S Wallace

Steven J Howard

J Rodney Walton

Jay Rodney Walton

Jay Rod Walton

Sanjiv Nanda

Irina Medvedev

Fuyun Ling

Oliver Michaelis

J Rodney Walton, Jr

Lizhong Zheng

Bjorn Bjerke

John Edward Smee

Peter S Gaal

Arnaud Meylan

Shravan K Surineni

Murali Paravath Menon

Nagabhushana T Sindhushayana

Ashok Bhatia

Hakan Inanoglu

Lalitaprasad Daita

Peter Monsen

Eric J Katzfey

Srinath Nagaraj

Sekharjyoti Baruah

Spatial spreading is performed in a multi-antenna system to randomize an 'effective' channel observed by a receiving entity for each transmitted data symbol block. For a MIMO system, at a transmitting entity, data is processed (e.g., encoded, interleaved, and modulated) to obtain Ndata symbol blocks to be transmitted in Ntransmission spans, where N&#x2265;1 and N&#x3e;1. The Nblocks are partitioned into Ndata symbol subblocks, one subblock for each transmission span. A steering matrix is selected (e.g., in a deterministic or pseudo-random manner from among a set of L steering matrices, where L&#x3e;1) for each subblock. Each data symbol subblock is spatially processed with the steering matrix selected for that subblock to obtain transmit symbols, which are further processed and transmitted via Ntransmit antennas in one transmission span. The Ndata symbol blocks are thus spatially processed with Nsteering matrices and observe an ensemble of channels.

Spatial spreading in a multi-antenna communication system

According to one aspect of the invention, a method is provided in which a control channel used for transmitting control information is partitioned into a plurality of subchannels each of which is operated at a specific data rate. For each of one or more user terminals, one of the subchannels is selected based on one or more selection criteria for transmitting control information from an access point to the respective user terminal. Control information is transmitted from the access point to a user terminal on a particular subchannel selected for the respective user terminal. At the user terminal, one or more subchannels are decoded to obtain control information designated for the user terminal.

Method and apparatus for providing an efficient control channel structure in a wireless communication system

Pilots suitable for use in MIMO systems and capable of supporting various functions are described. The various types of pilot include&#x2014;a beacon pilot, a MIMO pilot, a steered reference or steered pilot, and a carrier pilot. The beacon pilot is transmitted from all transmit antennas and may be used for timing and frequency acquisition. The MIMO pilot is transmitted from all transmit antennas but is covered with different orthogonal codes assigned to the transmit antennas. The MIMO pilot may be used for channel estimation. The steered reference is transmitted on specific eigenmodes of a MIMO channel and is user terminal specific. The steered reference may be used for channel estimation. The carrier pilot may be transmitted on designated subbands/antennas and may be used for phase tracking of a carrier signal. Various pilot transmission schemes may be devised based on different combinations of these various types of pilot.

Pilots for MIMO communication systems

An uplink channel response matrix is obtained for each terminal and decomposed to obtain a steering vector used by the terminal to transmit on the uplink. An 'effective' uplink channel response vector is formed for each terminal based on its steering vector and its channel response matrix. Multiple sets of terminals are evaluated based on their effective channel response vectors to determine the best set (e.g., with highest overall throughput) for uplink transmission. Each selected terminal performs spatial processing on its data symbol stream with its steering vector and transmits its spatially processed data symbol stream to an access point. The multiple selected terminals simultaneously transmit their data symbol streams via their respective MIMO channels to the access point. The access point performs receiver spatial processing on its received symbol streams in accordance with a receiver spatial processing technique to recover the data symbol streams transmitted by the selected terminals.

Multi-antenna transmission for spatial division multiple access

Certain embodiments of the present disclosure relate to a method and an apparatus for managing and optimizing service discovery in a peer-to-peer (P2P) wireless network. Nodes of the P2P network advertise their capabilities to their peers in the form of services. Efficient propagation and management of node's services to other nodes is proposed in the present disclosure.

Methods and systems for service discovery management in peer-to-peer networks

Spatial spreading is performed in a multi-antenna system to randomize an 'effective' channel observed by a receiving entity for each transmitted data symbol block. For a MIMO system, at a transmitting entity, data is processed (e.g., encoded, interleaved, and modulated) to obtain Ndata symbol blocks to be transmitted in Ntransmission spans, where N&#x2267;1 and N&#x3e;1. The Nblocks are partitioned into Ndata symbol subblocks, one subblock for each transmission span. A steering matrix is selected (e.g., in a deterministic or pseudo-random manner from among a set of L steering matrices, where L&#x3e;1) for each subblock. Each data symbol subblock is spatially processed with the steering matrix selected for that subblock to obtain transmit symbols, which are further processed and transmitted via Ntransmit antennas in one transmission span. The Ndata symbol blocks are thus spatially processed with Nsteering matrices and observe an ensemble of channels.

Certain embodiments of the present disclosure relate to methods for increasing a capacity in a peer-to-peer (P2P) wireless network. The methods include generating a connectivity metric (CM) value indicative of a number of other wireless nodes of the P2P wireless network to which the wireless node is connected, transmitting the CM value, and then transmitting full connectivity information maintained by the wireless node at a frequency determined based on the CM value. The disclosed methods therefore allow well-connected nodes of the P2P wireless network to be exploited in a manner that increases the overall connectivity of all the nodes in the network.

Methods and systems for exploitation of well-connected nodes in peer-to-peer wireless networks

Certain embodiments of the present disclosure relate to methods for increasing a capacity in a peer-to-peer (P2P) wireless network. The methods include generating a connectivity metric (CM) value indicative of a number of other wireless nodes of the P2P wireless network to which the wireless node is connected, receiving a query for services, and then responding to the query for services if the CM value is greater than a defined CM threshold value. The disclosed methods therefore allow well-connected nodes of the P2P wireless network to be exploited in a manner that increases the overall connectivity of all the nodes in the network.

Certain embodiments of the present disclosure relate to a method for improving the effective coverage of nodes within a peer-to-peer (P2P) wireless network. Collection of nodes of the P2P network can have a larger aggregate coverage footprint than any given single node. This inherent multi-site property of P2P wireless networks can be exploited to provide each node with benefits of multi-user diversity, thus improving discovery of devices in the P2P network.

Growing community of inventors

Harvard, MA, United States of America

John Wendell Ketchum