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Atheros Communications, Inc. Patents
Assignee:
Atheros Communications, Inc.
Address:
Santa Clara, CA
No. of patents:
202
Patents:


1 2 3 4 5










Patent Number Title Of Patent Date Issued
D602886 Shield design October 27, 2009
8018378 Satellite navigation receiver having a configurable acquisition engine September 13, 2011
A satellite navigation receiver having a flexible acquisition and tracking engine architecture. The flexible acquisition engine has a reconfigurable delay line that can be used either as a single entity or divided into different sections. Consequently, it can be configured to search
8010072 Charge pump current compensation for phase-locked loop frequency synthesizer systems August 30, 2011
A technique for improving frequency synthesizer performance by frequency-compensating charge pump current in order to maintain a consistent loop bandwidth over a wide operating frequency range is described. A relationship between the capacitance value associated with a voltage contro
8000227 Decision feedback channel estimation and pilot tracking for OFDM systems August 16, 2011
Current OFDM systems use a limited number of symbols and/or sub-channels to provide approximations for channel estimations and pilot tracking, i.e. phase estimations. For example, two training symbols in the preamble of a data packet are used to provide channel estimation. Four of the
7995547 Efficient communication channel survey August 9, 2011
A system and method are described for repeatedly and efficiently performing a wireless communication channel survey to determine whether comparable communications devices exist, which frequencies are in use, and the identities of the comparable communications devices. A beacon data t
7982549 Dual self-calibrating low-power oscillator system and operation July 19, 2011
A system may include a first circuit configured to generate a first clock having a first period of oscillation, and a second circuit configured to generate a second clock having a second period of oscillation, where the difference (.DELTA.T) between the first period of oscillation and th
7982546 Quadrature local oscillator generation for direct conversion radio transceiver July 19, 2011
A method of generating a quadrature local oscillator (LO) frequencies is provided. In this method, a voltage-controlled oscillator (VCO) frequency can be mixed with a divided version of the VCO frequency to generate mixed signals. A lower sideband of the mixed signals can be selected for
7982518 Controlling timing in asynchronous digital circuits July 19, 2011
A timing circuit for generating asynchronous signals is provided that uses minimal area while maximizing speed. This timing circuit can include a timing control block and disable/enable circuitry. The timing control block can include an SR latch and first and second delay blocks. The SR
7949356 Clock synchronization over a shared medium May 24, 2011
Communicating among stations in a network includes providing repeated beacon transmissions from at least some of the stations including a first station. The first station is assigned to a first level. Any stations that can reliably receive transmissions from the first station are ass
7944395 Weighted dilution of precision calculation for GPS fix qualification May 17, 2011
A method and apparatus for qualifying a Satellite Positioning System (SPS) location determination. A method in accordance with the present invention comprises determining a constellation of satellites used in the location determination, making a measurement set based on signals recei
7940794 Dynamic channel bandwidth management May 10, 2011
To provide an extra wide bandwidth communication using standard channels, multiple non-overlapping channels can be used. To provide a 40 MHz communication, two non-overlapping 20 MHz channels, i.e. a control channel and an extension channel, can be used to provide an effective 40 MHz
7936642 High sensitivity GPS-assisted time source May 3, 2011
A method for determining portions of a GPS satellite signal may use non-coherent integration to determine a repeated pattern such as a preamble. Once the repeated pattern is determined, portions of the GPS satellite signal that may be determined with partial correlation sums. Sensiti
7929508 Radio frequency signal analysis and classification using time-frequency information April 19, 2011
A signal analysis mechanism for processing and classifying an RF signal received at a WLAN device. A plurality of spectral data captures comprising time-frequency data and receive signal strength indicator (RSSI) data associated with the RF signal received at the WLAN device are gene
7924932 Decoding system and method for digital communications April 12, 2011
A Viterbi decoding system interprets bits in received QAM constellations as many-valued parameters rather than binary valued parameters. It performs the Viterbi algorithm using these many-valued parameters to provide results superior to hard decision decoding. Rather than applying a
7920441 Optimized time acquisition algorithm for low-power GPS-based watch applications April 5, 2011
A GPS enabled timepiece. A Global Positioning System (GPS) enabled timepiece in accordance with the present invention comprises a timepiece, the timepiece comprising a local oscillator, and a GPS receiver, coupled to the timepiece, the GPS receiver using the local oscillator to predict
7916746 Media access control protocol with priority and contention-free intervals March 29, 2011
An access contention scheme is described for use by a station in a network of stations. Access contention by a station having a frame to be transmitted includes detecting contention control information for a contention period and determining from the contention control information if
7912095 Dynamic preamble detection March 22, 2011
A data packet, comprising a preamble and the preamble comprising a plurality of synchronization bits, is received where the preamble may be of either a first preamble type or a second preamble type. Channel estimation is performed using at least a first portion of the plurality of sy
7907080 Radar detection for wireless communication devices March 15, 2011
A method and apparatus for detecting radar signals in single and multiple (extension) channel wireless network frequencies uses spectral and DC analysis. Spectral images produced through a Fast Fourier transform may be captured and analyzed to determine if any radar signals may be presen
7904021 Selecting carriers for modulating signals in a communication network March 8, 2011
Communicating over a network of communication stations includes monitoring for reception of an electromagnetic wave that has a power above a threshold and a frequency in a predetermined frequency interval, and selecting carrier frequencies for modulating information onto signals tran
7899472 Positioning with wireless local area networks and WLAN-aided global positioning systems March 1, 2011
Accurate position capability can be quickly provided using a Wireless Local Area Network (WLAN). When associated with a WLAN, a wireless device can quickly determine its relative and/or coordinate position based on information provided by an access point in the WLAN. Before a wireless
7898309 Analog duty cycle correction loop for clocks March 1, 2011
Providing duty cycle correction can include determining whether a clock signal has a duty cycle greater than 50% based on averaging the clock signal and comparing that averaged clock signal to 1/2 VDD. When the duty cycle is greater than 50%, the clock signal can be selected. When the
7894487 Time synchronization in a network February 22, 2011
A method and corresponding system for communicating between stations in a network is presented. The method includes providing repeated beacon transmissions from a coordinator station for coordinating transmissions among the stations; transmitting a signal from a first station and rec
7865150 Dual frequency band wireless LAN January 4, 2011
A dual band radio is constructed using a primary and secondary transceiver. The primary transceiver is a complete radio that is operational in a stand alone configuration. The secondary transceiver is a not a complete radio and is configured to re-use components such as fine gain con
7853216 Multi-channel RX/TX calibration and local oscillator mismatch mitigation December 14, 2010
A method and system of optimizing transmit beam forming in a multiple radio wireless system is provided. A stimulus signal can be provided to an analog receive input of a device under test (DUT), wherein the DUT includes multiple radios. A receive phase and amplitude can be measured
7848219 Radar detection for wireless communication devices December 7, 2010
A method and apparatus for detecting radar signals in single and multiple (extension) channel wireless network frequencies uses spectral and DC analysis. Spectral images produced through a Fast Fourier transform may be captured and analyzed to determine if any radar signals may be presen
7847613 Variable transconductance mixer system December 7, 2010
A variable transconductance device for a mixer apparatus is provided. The apparatus includes at least one variable current source circuit having a plurality of selectively enabled current source stages. Each of the current source stages, when enabled, is actuable to establish a condu
7835711 Method and apparatus for a signal selective RF transceiver system November 16, 2010
Method and apparatus to dynamically configure the signal reception selectivity of a plurality of transceivers is described. In one embodiment, a transceiver includes a receiver circuit having two or more filter circuits. Each of the filter circuits is configured to pass RF signals fr
7835456 Spur mitigation techniques November 16, 2010
Spurs cause significant problems with signal detecting, amplifier gain adjustment, and signal decoding. Various techniques can be used to mitigate the effects of spurs on a received signal. Generally, these techniques work by either canceling or ignoring the spurs. For example, a pil
7834790 Communication device including a power reduction mechanism November 16, 2010
A communication device includes a communication port that includes a digital to analog converter (DAC) that may be configured to output for transmission an analog signal that corresponds to a digital input such as link data that is to be transmitted on a physical link. The communication
7826521 Rate adaptation using error vector magnitude November 2, 2010
Rate adaptation is accurately provided by using an average SNR technique, a predicted PER technique, or an EVM to PER mapping technique. An average SNR is computed by averaging EVM values in a particular domain. Using the computed average SNR, an optimized rate is determined. The predict
7826466 Communication buffer scheme optimized for VoIP, QoS and data networking over a power line November 2, 2010
Media Access Control (MAC) layer transmit and receive buffering with multi-level prioritization. The receive buffering allocates receive buffers for receiving frame data from a PHY interface in priority order using both a static and dynamic buffer allocation, and delivers completed b
7825723 Method and apparatus using an I/O device to eliminate a level shifter in low-voltage CMOS integr November 2, 2010
This discloses an integrated circuit and at least one CMOS analog circuit including a first circuit component generating an output signal received by a second circuit component to generate a feedback signal received by the first component to regulate the output signal, where the transist
7822059 Managing contention-free time allocations in a network October 26, 2010
A method and corresponding system for communicating between stations in a network are presented. The method includes providing repeated beacon transmissions from a coordinator station for coordinating transmissions among a plurality of the stations; transmitting from a first station to a
7821305 Dual voltage buffer with current reuse October 26, 2010
A voltage buffer with current reuse is described. This voltage buffer can advantageously provide a relatively wide voltage differential using a relatively low current. In one embodiment, a slave branch can be used to minimize potential spikes/glitches in the voltage buffer.
7821118 Power distribution pattern for a ball grid array October 26, 2010
A reduced inductance power distribution pattern for an integrated circuit (IC) package is disclosed. The IC package can include a die in which the electronic circuitry is formed, a ball grid array (BGA) substrate, and a plurality of conductive balls coupled to the BGA substrate. The IC
7813711 Stacking baseband circuits using deep n-well and increased supply voltage October 12, 2010
A method of designing stacked circuits for an integrated circuit is described. In this method, a plurality of devices that are stackable may be determined. Some of those devices, i.e. a subset of stackable devices, may be formed in a deep n-well, thereby allowing that subset of stackable
7800531 High precision positioning system September 21, 2010
A method for determining a position uses an access point array, a reference station, a location server and a client terminal. The reference station may include a GPS receiver to acquire and track GPS satellites. GPS data may be provided to the location server. The access point array
7792158 Media streaming synchronization September 7, 2010
A system and method for closely synchronizing the transmission of real-time data streams is described. Synchronization data is transmitted by a cycle master for receipt by one or more cycle slaves. A cycle slave updates an internal state based on synchronization data received from the
7792052 Method and system for testing and optimizing the performance of a radio communication device September 7, 2010
A radio communication device is tested by forwarding relevant signal characteristic data derived at the physical (PHY) layer to the media access control (MAC) layer for processing, analysis and feedback to the radio circuit to improve performance. The relevant signal characteristics
7787227 Apparatus and method for electrostatic discharge protection of a transmit integrated circuit August 31, 2010
An apparatus and method for providing electrostatic discharge protection of a transmit integrated circuit including an ESD protect block coupled to an integrated circuit pad in a package without bond wires, and an ESD clamp circuit coupled between the ESD protect block and ground. During
7772932 Quadrature local oscillator generation for direct conversion radio transceiver August 10, 2010
A method of generating a quadrature local oscillator (LO) frequencies is provided. In this method, a voltage-controlled oscillator (VCO) frequency can be mixed with a divided version of the VCO frequency to generate mixed signals. A lower sideband of the mixed signals can be selected for
7768960 Efficient communication channel survey August 3, 2010
A system and method are described for repeatedly and efficiently performing a wireless communication channel survey to determine whether comparable communications devices exist, which frequencies are in use, and the identities of the comparable communications devices. A beacon data t
7768363 Inter-stage coupling with a transformer and parallel AC-coupling capacitor August 3, 2010
An RF coupling circuit including a transformer and a parallel AC-coupling capacitor can advantageously ameliorate substantial attenuation of a signal, prevent destabilization of any feedback loop, and simplify the circuit design process. The AC-coupling capacitor can act as an "avera
7768346 System for amplifier linearization with envelope feedback August 3, 2010
An amplifier with linearization feedback includes an amplification stage that receives a feedback control signal from an envelope detection feedback network. The envelope detection feedback network controls the gain of the amplification stage based on an envelope of an input signal o
7768324 Dual voltage buffer with current reuse August 3, 2010
A voltage buffer with current reuse is described. This voltage buffer can advantageously provide a relatively wide voltage differential using a relatively low current. In one embodiment, a slave branch can be used to minimize potential spikes/glitches in the voltage buffer.
7764727 Selecting MCS in a MIMO system July 27, 2010
An accurate total error rate performance can be measured using a computed error vector magnitude (EVM) per stream. Using this EVM, the receiver or the transmitter can advantageously generate an optimized modulation and coding scheme (MCS) that corresponds to a specific number of streams,
7764664 Modified start frame delimiter detection July 27, 2010
A modified approach to detecting the start frame delimiter (SFD) is disclosed. A receiving system scans a decoded but not yet de-scrambled received signal for a scrambled version of the SFD associated with the preamble format being used. Using this approach, it is not necessary to us
7756082 Wireless LAN using background scanning technique July 13, 2010
Background scanning can include using a power save mode to momentarily suspend transmission between a current access point and a client. Information regarding other access points can then be collected. The client can return to the current access point before communication between the
7756039 Data plane aggregation based on route and service type July 13, 2010
Methods and systems are operable to aggregate data. A plurality of data units can be received. The data units can be combined based upon a class associated with the data and a next hop associated with the data. A link can be provided for the combined data units based on service quality
7751520 Packet detection, synchronization, and frequency offset estimation July 6, 2010
Techniques are disclosed for detecting a packet. One technique includes sampling a received signal to produce a sequence of samples wherein the sequence of samples includes a plurality of subsequences of samples; cross correlating the subsequences of samples with a known form of the
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