Abstract: A base station that communicates with subscriber stations in an OFDM wireless network. The base station transmits a first data stream and a second data stream to a subscriber station using a first virtual antenna and a second virtual antenna. The base station allocates first data symbols associated with the first data stream to be transmitted from the first virtual antenna in a first selected group of subbands of OFDM subcarriers and allocates second data symbols associated with the first data stream to be transmitted from the second virtual antenna in a second selected group of subbands of OFDM subcarriers.

Abstract: A base station for use in a wireless network, wherein the base station transmits in a downlink to a plurality of subscriber stations using a plurality of antennas according to a multiple input, multiple-output (MIMO) protocol. During a first downlink subframe, the base station operates in single-user MIMO mode in which the base station transmits a first data subpacket to a first subscriber station using a first antenna and transmits a second data subpacket to the first subscriber station using a second antenna. During a second downlink subframe following the first downlink subframe, the base station operates in multi-user MIMO mode in which the base station transmits a third data subpacket to the first subscriber station using the first antenna and transmits a fourth data subpacket to a second subscriber station using the second antenna.

Abstract: A wireless communication system is disclosed wherein an information source communicates with a mobile station via multiple intermediary base stations located in respective cells of a broadcast zone. In one embodiment, each base station sends multiple information streams that may be received by a mobile station located in the broadcast zone. By receiving multiple information streams from multiple base stations, the mobile station may enhance reception. In one embodiment, a base station transmits an information stream that includes a base layer and another information stream including an enhanced layer. If a receiver in a mobile station receives an enhanced layer with more than a predetermined amount of quality, then the receiver uses information in the received enhanced layer to supplement information in the received base layer.

Abstract: A wireless communication system is disclosed wherein an information source communicates with a mobile station via multiple intermediary base stations located in respective cells of a broadcast zone. In one embodiment, each base station sends multiple information streams that may be received by a mobile station located in the broadcast zone. By receiving multiple information streams from multiple base stations, the mobile station may enhance reception. In one embodiment, each base station in a broadcast zone transmits an information stream that exhibits a first level of robustness and another information stream that exhibits a second level of robustness.

Abstract: A method of uplink scheduling in an Orthogonal Frequency Division Multiple Access network is provided. The method includes classifying each of a plurality of users as one of an exploration user and a utilization user. The users are then scheduled based on the classification of each of the users as one of an exploration user and a utilization user.

Abstract: A method of generating beam-forming weights in an orthogonal frequency division multiplexing network is provided. The method includes generating a plurality of sub-bands. Each sub-band comprises a plurality of sub-carriers. A single beam-forming weight is generated for each sub-band.

Abstract: A method of providing adaptive modulation and coding in a multi-carrier wireless network that includes a plurality of subscriber stations is provided. The method includes, for each of the subscriber stations, selecting a type of modulation and a coding rate based on a signal-to-interference-plus-noise ratio (SINR) variance.

Abstract: A method of wireless communication is provided. The method comprises adaptively polling a plurality of subscriber stations to provide channel quality indications for a plurality of channels associated with at least a portion of an orthogonal frequency division multiple access wireless network and adjusting the at least a portion of the orthogonal frequency division multiple access wireless network based on the channel quality indications.

Abstract: In a multiple-input, multiple-output (MIMO) enabled mesh network, streams for transmitting data from a node to a destination node are controlled based on next hop latency and available stream capacity at neighboring, next hop nodes. Routing information maintained and dynamically updated at each node includes latency information associated with each next hop for transmission from the node to a given destination node and current available stream capacity for such next hop nodes. A controller at the node utilizes that information to select one or more next hop nodes to which the data is forwarded as well as to determine a number of streams that may be initiated with each selected next hop node.

Abstract: A method of calibrating multiple types of base stations is provided. The method includes selecting one of a plurality of technology types for the wireless base station. The wireless base station has an adaptive antenna array. A calibration is performed for the wireless base station based on the selected technology type.

Abstract: A base station for use in a wireless network capable of communicating with a plurality of mobile stations in a coverage area of the wireless network. The base station comprises a controller for controlling use of an Auxiliary Pilot channel. The controller causes the base station to i) terminate use of the Auxiliary Pilot channel in a first mode, ii) transmit data traffic to a first mobile station using the Auxiliary Pilot channel in a second mode, and iii) transmit data traffic to the first mobile station using a traffic channel phase-matched to a wide sector pilot channel signal in a third mode.

Abstract: A method of channel estimation and interference cancellation in an Orthogonal Frequency Division Multiple Access network is provided. The method includes determining an estimate of a transmitted signal based on an initial channel estimate and a received signal. An extracted transmitted signal is generated based on the estimate of the transmitted signal using a data integrity checking method. A subsequent channel estimate is generated based on the received signal and the extracted transmitted signal. If a subsequent iteration criterion is met, a subsequent estimate of the transmitted signal is determined based on the subsequent channel estimate and the received signal. A subsequent extracted transmitted signal is generated based on the subsequent estimate of the transmitted signal using a data integrity checking method. An additional subsequent channel estimate is generated based on the received signal and the subsequent extracted transmitted signal.

Abstract: A method of processing multiple-input/multiple-output pilot signals in an Orthogonal Frequency Division Multiplexing network is provided. The method includes, for each of a plurality of transmit antennas in a transmit antenna array, generating a processed pilot signal using a gain unique to the transmit antenna and transmitting the processed pilot signal.

Abstract: A base station for communicating with mobile stations in a coverage area of a wireless network. The base station comprises a first transmit antenna, a second transmit antenna, and an RF transceiver for generating an outgoing RF signal to be transmitted via the first and second transmit antennas to the mobile stations. The base station also comprises a switch coupling the RF transceiver to the first and second transmit antennas. The switch alternately directs the outgoing RF signal to the first transmit antenna during a first portion of a forward channel data frame and directs the outgoing RF signal to the second transmit antenna during a remaining portion of the forward channel data frame.

Abstract: A mobile terminal comprising a local display for displaying multimedia data. The mobile terminal receives multimedia data via a first wireless interface and transmits the received multimedia data to an external display via a second wireless interface. The mobile terminal transmits the received multimedia data to the external display if the mobile terminal determines the quality of the external display is superior to the quality of the local display.

Abstract: A flexible and scalable deployment of orthogonal frequency division multiplexing (OFDM) technology in a mobile cellular system, including a system that deploys multiple channels within a common base station, in which different modulation techniques are used to compensate for adjacent-channel interference.

Abstract: A flexible and scalable deployment of orthogonal frequency division multiplexing (OFDM) technology in a mobile cellular system, including a system that deploys multiple channels within a common base station, in which overlapping subcarriers are accepted and a significant amount of resulting interference is corrected.

Abstract: A wireless network base station capable of canceling interference caused by a dominant interferer signal from a mobile station. The base station comprises down-converts an RF to a down-converted signal, r(n). K complex PN demodulators multiply the down-converted complex r(n) signal by PN code sequences associated with each of the K mobile stations to produce K chip streams. K Walsh code demodulators multiply each of the K chip streams by a Walsh code associated with a mobile stations to produce K raw user signals. K subtractors subtract a first estimated interference signal associated with the dominant interferer signal from the K raw user signals to produce K estimated user signals. A detector receives the K estimated user signals and produces a detected user signal for each of the mobile stations. An interference estimator then determines which detected user signal is the dominant interferer signal.

Abstract: A method and wireless system that is able to adapt forward channel signal parameters to the different channel characteristics in each deployment environment. For example, the base station may update the waveform parameters based upon the real-time channel measurement feedback as received from the subscriber stations.

Abstract: A transmitting apparatus is provided for a base station capable of communicating with a plurality of mobile stations in a wireless network. The transmitting apparatus includes a beamforming traffic path for use in beamforming transmission to one of the mobile stations, and a diversity traffic path for use in diversity transmission to the mobile station. A selector is coupled to the beamforming traffic path and the diversity traffic path for dynamically selecting which of the traffic paths is used for transmission to the mobile station.