Abstract: The embodiments of the invention describe a method for antenna selection in a wireless communication network. The network includes a transceiver having a set of antennas. The transceiver is configured to transmit a frequency-hopped sounding reference signal (SRS) over a subband from a subset of antennas at a time. The transceiver transmits the frequency-hopped SRS from subsets of antennas in the set of antennas substantially alternately. In response to the transmitting, the transceiver receives information indicative of an optimal subset of antennas and transmits data from the optimal subset of antennas.

Abstract: Embodiments of the invention describe a method for antenna selection (AS) in a wireless communication network, the network comprising user equipment (UE), wherein the UE comprises a plurality of subsets of antennas including a selected subset of antennas and an unselected subset of antennas, wherein only the selected subset of antennas is used for transmitting user data, and wherein the UE is configured to transmit only from a subset of antennas at a time. The method transmits the user data from the selected subset of antennas within a set of subframes, and transmits a sounding reference signal (SRS) from the unselected subset of antennas within at least one subframe in the set of subframes to enable antenna selection for user data transmission.

Abstract: A method and system processes reference signals (115) for an uplink channel (103) between a transmitter, such as user equipment, and a receiver such as a base station, in a wireless communication network. A sequence of symbols to be transmitted is converted to a sequence of sub frames. The sequence of sub frames is grouped into groups of sub frames. Each sub frames includes at least two time-adjacent sub frames, and reference signals are inserted in a subset of the sub frames.

Abstract: A method selects antennas in a wireless network including a base station and one or more transceivers. The base station specifies times, subcarriers and subsets of antennas to use to transmit sounding reference signals (SRS) to the base station. Then, the transceiver transmits the SRS according to the specified times and subcarriers using different subsets of the set antennas. The SRS are received in the base station, and the base station selects one of the different subset of the antennas based on the received SRS, and indicates the selected subset of the antennas to the transceiver.

Abstract: A method selects a route in a wireless cooperative relay network of nodes, the nodes including a source, a set of relays, and a destination. A codeword is encoded as a data stream. The data stream is transmitted from a source to a destination via a set of relays. Mutual information is accumulated at a particular node to decode the data stream and recover the codeword. Then, a route from the source to the destination is selected based on channel state information between the nodes while transmitting and accumulating.

Abstract: A method and system selects a subset of antennas from a set of antennas to transmit user data in a wireless communication system. The user data is transmitted during a first transmission time intervals (TTI) using a first subset of antennas. Pilot tones are transmitted during a second TTI using a second subset of antennas. Corresponding channel qualities are estimated for the first subset of antennas and the second subset of antennas from the user data and the pilot tones. Then, based on the estimating, a best subset of antenna is selected from the first subset of antennas and the second subset of antennas to transmit the user data during a subsequent TTI.

Abstract: A method and system transmits an input stream of data symbols in a multiple-input/multiple-output wireless communications system that includes M subgroups of transmitting antennas. A stream of data symbols is provided to a combined switch and demultiplexer. The combined switch and demultiplexer selects a subset L of the M subgroups of antennas as active, where L<M. The demultiplexer then splits the data stream into L substreams, which are fed to the L subgroups of antennas. Before transmission, each of the L substreams is adaptively modulated and coded to a maximum data rate while achieving a predetermined performance on an associated channel used to transmit the substream. Space-time transmit diversity encoding is applied to each coded substream to generate multiple output streams, one output stream for each antenna of each of the L subgroups. The selection by the switch is based on channel conditions fed back by a receiver of the output streams.

Abstract: A method and network communicate packets by assigning, in each one of a set of multiple transmitters, a power level to a packet to be transmitted during a time interval. The power level is selected from a set of power levels available for the set of multiple transmitters. The power levels in the set range from highest to lowest. There is one packet for each transmitter such that there is a set of packets to be transmitted during the time interval. The set of packets is transmitted concurrently during the time interval to enable decoding of at least one of the packets in the set of packets during the time interval.

Abstract: A method is provided for receiving data at a receiver via a communication channel from a transmitter having at least two transmitter antennas, the method including: receiving (S204) a codebook including an assignment of at least two respective codewords to the at least two transmitter antennas, the assignment being based at least in part on a characteristic of the communication channel; detecting a state of the communication channel by which the receiver can communicate with the transmitter; selecting (S206) at least one desired transmitter antenna from the at least two antennas based at least in part on the detected state of the communication channel; transmitting (S208) to the transmitter a codeword corresponding to the at least one desired transmitter antenna; and receiving (S210) data at the receiver transmitted by the transmitter.

Abstract: A method transmits and receives signals in a cooperative, multi-user, multi-input, multi-output network. The network includes base stations (BSs) and mobile stations (MSs). Each BS has at least two antennas, and each MS has at least one antenna. At a first base station and a second base station using linear pre-coding matrices, a plurality of data streams are jointly pre-coded to produce first signals and second signals. The first signals are transmitted synchronously from the first BS and the second BS to a first MS, and the second signals are transmitted synchronously from the first BS and the second BS to a second MS, and in the first signal and the second signal are asynchronous with respect each other.

Abstract: A method and system selects antennas in a wireless network including a base station and user equipment (UE) transceivers. The base station specifies times and frequencies to transmit sounding reference signals (SRSs), and antennas to use to transmit the SRSs for the specified times and frequencies. The transceivers transmit the SRS according to the specified times, frequencies, and antennas. The base station selects subsets of the set of available sets of antennas, and indicates the selected subset of antennas to the transceiver.

Abstract: A method and system selects antennas in a wireless network including a base station and user equipment (UE) transceivers. The base station specifies times and frequencies to transmit sounding reference signals (SRSs), and antennas to use to transmit the SRSs for the specified times and frequencies. The transceivers transmit the SRS according to the specified times, frequencies, and antennas. The stopping and starting of the SRS are specified implicitly. The base station selects subsets of the set of available sets of antennas, and indicates the selected subset of antennas to the transceiver.

Abstract: The invention describes a method for transmitting a packet in a wireless network of nodes. At a beginning of a scheduled time slot a metric in the node is set, in which the metric indicates a need to transmit a packet to a receiver in the wireless network. The metric is mapped to a received power level and the packet is transmitted at a transmit power level so that the received power level is achieved at the receiver.

Abstract: A method selects antennas in an OFDMA network. A channel state of a downlink is measured using a downlink subframe received in a mobile station from a base station. A channel state of an uplink is measured using an uplink subframe received in the base station from the mobile station. Next, the method compares the channel states to determine whether the downlink and the uplink are reciprocal or not. The mobile station can perform receive antenna selection based on the quality of the downlink channel state. The mobile station can also perform transmit antenna selection when instructed by the base station.

Abstract: A method generates signals in a transmitter of a multiple-input, multiple-output wireless communications system. The transmitter includes Nt transmit antennas. A transmit covariance matrix Rt determined using statistical state information of a channel. The transmit covariance Rt matrix is decomposed using transmit eigenvalues ?t to obtain a transmit eigenspace Ut according to Rt=Ut?tU†t, where † is a Hermitian transpose. A pilot eigenspace Up is set equal to the transmit eigenspace Ut. A NtxTp block of pilot symbols Xp is generated from the pilot eigenspace Up and pilot eigenvalue ?p according to Xp=Up?p1/2. A data eigenspace Ud is set equal to the transmit eigenspace Ut. In addition, a Nt×Nt data covariance matrix Qd is generated according to Ud?dU†d, where ?d are data eigenvalues. A NtxTd block of data symbols is generated, such that an average covariance of each of the columns in the block of data symbols Xd equals the data covariance matrix Qd.

Abstract: A method and system generating signal to select a subset of antennas from a set of antennas to transmit user data in a wireless communication system. User data are transmitted during a first transmission time intervals (TTI) using a first subset of antennas. Pilot tones are transmitted during a second TTI using a second subset of antennas. Corresponding channels are estimated for the first subset of antennas and the second subset of antennas from the user data and the pilot tones. Then, based on the estimating, an optimal subset of antenna is selected from the first subset of antennas and the second subset of antennas to transmit the user data during a sequent TTI, and in which the selecting is performed adaptively.

Abstract: In a wireless network using cooperative relaying, a set of messages are broadcast from a base station to a set of relay stations during a first phase of a scheduling interval. During a second phase of the scheduling interval, the set of messages from the set of relay stations are broadcasting cooperatively to a set of mobile stations, while broadcasting. While broadcasting, a time and a rate and a size of each message is optimized during the first phase, and a rate of each message is optimized during the second phase.

Abstract: A method and system switches antennas in an orthogonal frequency division multiplexed access (OFDMA) wireless communication system while transmitting symbols. Each symbol includes a cyclic prefix and a block of data signals. The symbols are transmitted during a first portion of a transmission time interval (TTI), from a first antenna. Then, the RF chain is switched to a second antenna to transmit the symbols, and in which the switching is performed substantially between transmitting two consecutive transmitted symbols.

Abstract: A method selects a route in a wireless cooperative relay network of nodes, the nodes including a source, a set of relays, and a destination. A codeword is encoded as a data stream. The data stream is transmitted from a source to a destination via a set of relays. Mutual information is accumulated at a particular node to decode the data stream and recover the codeword. Then, a route from the source to the destination is selected based on channel state information between the nodes while transmitting and accumulating.

Abstract: A method selects an optimal route in a cooperative relay network including a set of nodes. For each node in a set of nodes of a cooperative relay network, dynamically varying channel state information is determined. A transmission policy based on the dynamically-varying channel state information is selected, in which the transmission policy includes selected nodes forming an optimal route, a transmission mode for each selected node, and a transmission power for each selected node.