Abstract: Methods, systems, and devices for reducing the impact of a jamming signal on wireless communications are described. Generally, the described techniques provide for receiving a first signal at a first antenna and receiving a second signal at a second antenna. An anti-jammer manager may process the first signal and the second signal to obtain a residual signal. The processing may include determining a weighting factor based at least in part on a correlation between the first signal and the second signal, applying the weighting factor to the first signal to create a weighted first signal, and subtracting the weighted first signal from the second signal to obtain the residual signal. A demodulator may demodulate the residual signal to obtain symbol information. A decoder may decode the symbol information to obtain data. The techniques may be used to recover a desired signal portion from a jammed signal.

Abstract: Disclosed is a Link 16 terminal having a receiver and a transmitter. The receiver may be configured to process received signals in a receive mode to produce digitized samples, which may then be processed in a digital signal processor. The transmitter may be configured to produce a transmit signal that is provided to an antennas for transmission during transmit mode. The transmit signal may also be provided to the receiver in transmit mode to produce digitized samples of the transmit mode, may then be processed in a digital signal processor for compliance with requirements for Link 16 transmissions.

Abstract: A transceiver having substantially improved capacity and interference mitigation. The transceiver comprises a first direct conversion receiver (DCR) and a plurality of additional DCRs, each of the plurality of additional DCRs having essentially identical constituent components to the first DCR. Each DCR does a direct down-conversion from RF to a complex pair of baseband I and Q components. The complex signal pair from each DCR is digitized and further processed in a modem module where the signal is optimally filtered, demodulated, and error-corrected. The modem module reconstructs the message information contained in each signal from all of the DCR's, simultaneously providing the demodulated data that was contained in the RF signals. The dynamic range of the system is extremely large (i.e., approximately 80 dB).

Abstract: Wireless communication techniques for cellular deployment of wireless communication systems with transmitters in each cell to have partially overlapped transmission patterns between two adjacent transmitters. Implementations of the described techniques can provide transmit diversity with intentional partial beam pattern overlays to improve cell sectorization or frequency re-use factor, at the same time, reduce intra-cell and inter-cell interference. Various modulations may be used in the described systems, including FDMA, TDMA, and OFDMA modulation schemes.

Abstract: A wireless access point (AP) stores a region code that identifies a country/region in which the wireless AP is designed to operate. This region code can be provided by the wireless AP vendor, or in response to information provided by the wireless AP user or a GPS receiver. In response to the region code, the wireless AP identifies one or more WiFi channels that are subject to interference within the region due to the non-WiFi wireless communication channels that are approved for use within the region. The wireless AP then selects a WiFi channel for wireless communication, wherein the wireless AP avoids selecting the WiFi channels identified as being subject to interference within the region.

Abstract: Devices, systems and techniques to monitor signal fading based on a cluster of subcarriers at a receiver and feedback monitored signal fading to a transmitter in wireless communication systems such as OFDM and OFDMA systems.

Abstract: Techniques of selective demodulation of downlink frames using a subscriber description segment or activity descriptor to identify one or more subscriber stations to which at least a portion of data placed in the downlink frame is addressed in wireless communication systems such as frame-based point-to-multipoint wireless communication systems. The described techniques can be used to reduce power consumption at each subscriber station and to elongate the battery time of mobile devices, especially in the bursty Internet data transmission. The subscriber station can use information in the subscriber description segment or activity descriptor to decide whether to turn off receiver power for the remainder of a received downlink frame.

Abstract: Wireless communication techniques for cellular deployment of wireless communication systems with transmitters in each cell to have partially overlapped transmission patterns between two adjacent transmitters. Implementations of the described techniques can provide transmit diversity with intentional partial beam pattern overlays to improve cell sectorization or frequency re-use factor, at the same time, reduce intra-cell and inter-cell interference. Various modulations may be used in the described systems, including FDMA, TDMA, and OFDMA modulation schemes.

Abstract: Techniques for generating preamble sequences for OFDM and OFDMA communication systems based on CAZAC sequences with desired properties of constant amplitudes (CA) and zero autocorrelation (ZAC). Such preamble sequences may be used for synchronization and identification of individual transmitters. For example, the OFDMA symbol is constructed using a CAZAC sequence in the frequency-domain and the resulting time-domain waveform is a near-CAZAC sequence.

Abstract: Devices, systems and techniques to monitor signal fading based on a cluster of subcarriers at a receiver and feedback monitored signal fading to a transmitter in wireless communication systems such as OFDM and OFDMA systems.

Abstract: Techniques for fast cell search, selection and reselection for wireless communication systems such as OFDM or OFDMA communication systems. In various implementations of the described techniques, downlink subframes from base stations to mobile stations are designed to include information in form of preambles or post-ambles in one or more downlink subframes to facilitate cell search at receiving mobile stations at high speeds. The described preambles and post-ambles may also be used to improve the accuracy of signal synchronization in time and frequency.

Abstract: Techniques for fast cell search, selection and reselection for wireless communication systems such as OFDM or OFDMA communication systems. In various implementations of the described techniques, downlink subframes from base stations to mobile stations are designed to include information in form of preambles or post-ambles in one or more downlink subframes to facilitate cell search at receiving mobile stations at high speeds. The described preambles and post-ambles may also be used to improve the accuracy of signal synchronization in time and frequency.

Abstract: Techniques for fast cell search, selection and reselection for wireless communication systems such as OFDM or OFDMA communication systems. In various implementations of the described techniques, downlink subframes from base stations to mobile stations are designed to include information in form of preambles or post-ambles in one or more downlink subframes to facilitate cell search at receiving mobile stations at high speeds. The described preambles and post-ambles may also be used to improve the accuracy of signal synchronization in time and frequency.

Abstract: Wireless communication techniques for cellular deployment of wireless communication systems with transmitters in each cell to have partially overlapped transmission patterns between two adjacent transmitters. Implementations of the described techniques can provide transmit diversity with intentional partial beam pattern overlays to improve cell sectorization or frequency re-use factor, at the same time, reduce intra-cell and inter-cell interference. Various modulations may be used in the described systems, including FDMA, TDMA, and OFDMA modulation schemes.

Abstract: A surround sound system includes a vertically elongated housing, a plurality of speakers arranged substantially vertically inside the housing, and one or more audio signal sources for outputting audio signals in multiple channels to the plurality of speakers. The multiple channels and speakers can be configured as a 5.1 system. The one or more audio signal sources may include a fixed media player embedded substantially within the housing, and a portable media player removably docked to the housing. A radio signal tuner and antenna are also included in the surround sound system and enclosed in the housing. The surround sound system may further include a Karaoke mixer and be used as a Karaoke performance machine.

Abstract: A system or method for controlling the delivery of fuel into the transient flow of an exhaust system to control emissions. A mathematical model representative of the exhaust system can be used to determine, based on operating conditions of the exhaust system, a rate of fuel delivery suitable for achieving a desired result. The desired result can be to increase the temperature of a diesel particulate filter to a temperature suitable for regeneration without exceeding a temperature that may damage the diesel particulate filter.

Abstract: The present disclosure relates to an exhaust treatment article including a substrate having a length that extends along a central longitudinal axis from a first end to second end. The substrate has walls defining a honeycomb arrangement of longitudinal passages that extend along the central longitudinal axis between the first and second ends. The substrate also has first, second and third zones that each extend along a portion of the length of the substrate with the second zone being positioned axially between the first and third zones. The exhaust treatment article also includes a washcoat layer coated on the first and third zones but not coated on the second zone.

Abstract: Devices, systems and techniques to monitor signal fading based on a cluster of subcarriers at a receiver and feedback monitored signal fading to a transmitter in wireless communication systems such as OFDM and OFDMA systems.

Abstract: Techniques for fast cell search, selection and reselection for wireless communication systems such as OFDM or OFDMA communication systems. In various implementations of the described techniques, downlink subframes from base stations to mobile stations are designed to include information in form of preambles or post-ambles in one or more downlink subframes to facilitate cell search at receiving mobile stations at high speeds. The described preambles and post-ambles may also be used to improve the accuracy of signal synchronization in time and frequency.

Abstract: Techniques for generating preamble sequences for OFDM and OFDMA communication systems based on CAZAC sequences with desired properties of constant amplitudes (CA) and zero autocorrelation (ZAC). Such preamble sequences may be used for synchronization and identification of individual transmitters. For example, the OFDMA symbol is constructed using a CAZAC sequence in the frequency-domain and the resulting time-domain waveform is a near-CAZAC sequence.