Abstract:
Methods, devices, and computer program products for improving training field design in packets with increased symbol durations are disclosed. In one aspect, a method of transmitting a packet on a wireless communication network is disclosed. The method includes transmitting a preamble of the packet over one or more space-time-streams, the preamble including one or more training fields configured to be used for channel estimation, the one or more training fields each comprising one or more symbols of a first symbol duration. The method further includes transmitting a payload of the packet over the one or more space-time-streams, the payload comprising one or more symbols of a second symbol duration, the second symbol duration greater than the first symbol duration.
Abstract:
Peer to peer direct mode connection is either time or frequency multiplexed with traffic towards an AP. One peer requests a first time or a first frequency for transmitting to a peer. Once the request is accorded and the direct traffic mode is carried out with the peer, in a second time or in a different frequency, further traffic is carried out by the peers with the AP.
Abstract:
Methods and apparatuses are proposed for supporting one or more user-dependent channel state information (CSI) feedback rates in a downlink spatial division multiple access (SDMA) system. For certain aspects, an access point (AP) may receive a channel evolution feedback from one or more stations and send a request for CSI to the stations whose CSI values need to be updated. For certain aspects, the AP may poll the stations for updated CSI values. For certain aspects, deterministic back-off timers may be assigned to the stations indicating when to send their CSI feedback. The proposed methods may improve system performance.
Abstract:
Systems, methods, and devices for concurrently allowing station-to- station transmissions and access point-to-station transmissions are described herein. A station requests an Access Point for an available channel frequency to coduct station-tostation communications. The AP replies with a coordination message indicating that two distinct channel frequencies are allowed for station-to-station communications and for AP-to-station communcations. AP-to-station and station-to- station communications may therefore coexist.
Abstract:
Systems, methods, and devices for discovering a wireless communications network are described herein. In some aspects, a transmitter of a station is configured to transmit a probe request. The probe request is addressed to one of a wildcard service set identifier and a service set identifier of a service set in which a relay operates. A receiver of the station is configured to receive a probe request response from the relay. The probe response comprises an identification of an access point the relay is associated with and capabilities of the relay.
Abstract:
Systems, methods, and devices for communicating and detecting training sequences are described herein. In one aspect, a method of wireless communication is provided. The method comprises receiving one or more short training field (STF) sequences comprising sixty-four values or less. The STF sequences comprise zero and non-zero values. The non-zero values are located at one or more indices of the STF that are separated by a multiple of at least four. The method further comprises determining a first correlation between the STF and the STF shifted by a first shift length. The method further comprises determining a second correlation between the STF and the STF shifted by a second shift length. The method further comprises determining a fast Fourier transform (FFT) size based on the first correlation and the second correlation. The method further comprises decoding one or more data symbols based at least in part on the determined FFT size.
Abstract:
Certain aspects of the present disclosure provide techniques and apparatus for managing transmit power in a television white space (TVWS) network. One example method generally includes transmitting a sequence of request-to-send (RTS) messages at different transmit power levels to an apparatus and determining if a clear-to-send (CTS) message was received in response to at least one of the RTS messages corresponding to a particular one of the transmit power levels. Another example method generally includes receiving, at a first apparatus from a second apparatus, a packet that cannot be decoded by the first apparatus; determining at least one of a time or a duration corresponding to the packet; transmitting a query with an indication of the at least one of the time or the duration; and receiving a message from the second apparatus in response to the query, the message identifying the second apparatus as a source of the packet.
Abstract:
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.
Abstract:
Methods and apparatuses are proposed for supporting one or more user-dependent channel state information (CSI) feedback rates in a downlink spatial division multiple access (SDMA) system. For certain aspects, an access point (AP) may receive a channel evolution feedback from one or more stations and send a request for CSI to the stations whose CSI values need to be updated. For certain aspects, the AP may poll the stations for updated CSI values. For certain aspects, deterministic back-off timers may be assigned to the stations indicating when to send their CSI feedback. The proposed methods may improve system performance.
Abstract:
A technique for generating a reduced bit-width in a signal generated by a first-type modulator in a communication apparatus that includes two distinct modulators. In particular, the communication apparatus includes a first modulator adapted to generate a first modulated signal quantified to a first bit-width, a second modulator adapted to generate a second modulated signal quantified to a second bit-width that is less than the first bit-width, and a device to generate a third modulated signal comprising a combination of the first and second modulated signals. In an exemplary implementation, the first modulator includes an OFDMA modulator, the second modulator includes a CDMA, and the combining device includes an IFFT. Additionally, an apparatus for processing a communication signal includes a tasklist cache memory having a tasklist, a processor adapted to provide a task to the tasklist, and a communication module adapted to fetch the task from the tasklist, and process the communication signal based on the retrieved task.