Abstract: A hybrid positioning system can be implemented to improve location estimation of a wireless network device when reference network devices can have different distance calibration constants. For each of a plurality of positions at which the wireless network device is placed and for each reference network device, a distance between the wireless network device and the reference network device is determined. A first positioning algorithm is executed to determine an intermediate location (corresponding to each position) of the wireless network device and a distance calibration constant for each reference network device based, in part, on a corresponding initial location of the wireless network device. A second positioning algorithm is executed to estimate a subset of the positions of the wireless network device based on the intermediate location (corresponding to the position) of the wireless network device and the distance calibration constant of each of reference network devices.

Abstract: A path selection unit selects a network communication path from a plurality of available network communication paths for transmitting data from a hybrid network device to a destination network device. A packet transmit unit determines path connection characteristics associated with the selected network communication path. The packet transmit unit generates a hybrid network packet for transmitting the data to the destination network device based, at least in part, on the path connection characteristics associated with the selected network communication path. The packet transmit unit transmits the hybrid network packet to the destination network device via the selected network communication path.

Abstract: A power-save mode for a wireless access point is provided. The wireless access point can determine if other wireless stations are associated with the wireless access point. If there are no associations, then the wireless access point may enter a power-save mode. Associations may be determined by recent associations with the wireless access point or by media access control address activity. In the power-save mode, power may be reduced to at least one area of the wireless access point. In the power-save mode, the wireless access point may stop sending beacon signals. If the wireless access point receives a trigger signal, the wireless access point may leave the power-save mode.

Abstract: This disclosure is directed to wireless communication systems having a receiver capable of detecting chirping radar pulses. The systems and methods include processing an input signal to obtain a spectral analysis that identifies which frequency exhibits maximum signal magnitude at a given time and determines a rate of change that frequency. By determining that the rate of change is within parameters established by the pulse width range and the chirping bandwidth range, the signal can be identified as a chirping radar pulse. By comparing the rate of change to known characteristics, the signal can be identified as a chirping radar pulse. Suitable characteristics include parameters for the rate of change established by the pulse width range and the chirping bandwidth range and linearity of the rate of change.

Abstract: A method of saving power in a wireless network can include determining a plurality of stations associated with an AP. The AP can create station groups using group selection logic. Notably, the group selection logic is transparent to the plurality of stations. A plurality of TIMs can then be sent, each TIM allowing only one station group access to a channel during a predetermined time interval, such as a beacon interval. In another method, a station can determine its sleep duration based on at least one of first information from the TIM to generate random sleep duration, second information regarding previous operation of the station, and third information regarding a status of the station. The first, second, and third information can include the number of stations associated with the AP and having buffered data based on the TIM, historical collisions, and power status.

Abstract: A hybrid network device can implement functionality to indicate the sequence of packets associated with a common packet stream transmitted via a plurality of packet routes and to manage out-of-order packet arrival. In a hybrid communication network, a first network device can determine sequence identifiers associated with a plurality of packets of a packet stream received from a second network device via a plurality of packet routes between the first network device and the second network device. The first network device can detect out-of-order delivery of one or more of the plurality of received packets based, at least in part, on the sequence identifiers associated with the plurality of packets. Consequently, the first network device can re-order at least a subset of the plurality of packets based on the sequence identifiers associated with the plurality of packets.

Abstract: This disclosure is directed to wireless communication systems having a receiver configured to search for transmitted packets using a single chain and then receive the transmitted packets using multiple chains. Such receivers feature a chain controller that operates a single chain during search mode and turns on additional chains after packet detection. As will be appreciated, the techniques of this disclosure take advantage of the structure of the mixed mode data packet preamble to allow multiple chains to be brought on line after detection of a packet by a single chain.

Abstract: A TOA positioning system can be implemented to improve location estimation of a wireless network device. A first subset of a plurality of reference wireless network devices for determining potential locations of the wireless network device and a second subset of the plurality of reference wireless network devices for determining an estimated location of the wireless network device can be selected. The first and the second subsets can be selected based on a plurality of distance measurements and an average distance and associated with each of the plurality of reference wireless network devices. The potential locations of the wireless network device can be determined based on the first subset of the plurality of reference wireless network devices. The estimated location of the wireless network device can be determined from the potential locations of the wireless network device based on the second subset of the plurality of reference wireless network devices.

Abstract: This disclosure involves methods and systems for reducing the voltage by a circuit such as a switching regulator during an overvoltage event by draining current from a voltage source when voltage exceeding a desired level is generated.

Abstract: This disclosure involves methods and systems for suppressing undesired limit cycles in switching regulators by determining when a limit cycle causes the inductor to charge for a time greater than the clock period and destabilizing such cycles.

Abstract: This disclosure involves systems for providing an oscillatory circuit having low phase noise featuring arrays of complementary VCO pairs connected in parallel.

Abstract: Systems and methods for authorizing customer premise equipment into a network. A publicly available network membership key can be provided to enable initial connection to the network. Unique network membership keys associated with various customer premise equipment can be provided to enable service level access to the network and/or authorization into a sub-cell associated with the network.

Abstract: Digital-to-analog conversion in a communication device typically results in superimposed spectral images in the frequency spectrum of the analog waveform. These superimposed spectral images can distort the analog waveform and potentially violate the spectral mask and the constraints on out-of-band emissions set by the FCC. The communication device can be configured to implement a spectral image cancellation unit with feed-forward architecture to minimize the spectral images in the frequency spectrum of the analog waveform. The spectral image cancellation unit can generate a spectral image error signal comprising the spectral images at one or more spectral image frequencies. The spectral image cancellation unit can then subtract the spectral image error signal from the analog waveform to reduce spectral image components of the analog waveform and to yield an output signal for transmission.

Abstract: The present application describes a system and method for validating a detachable antenna which may include, coupling a detachable antenna to a wireless device, providing an antenna identification code of the detachable antenna to the wireless device, determining if the antenna identification code of the detachable antenna is a valid antenna identification code for the wireless device and enabling operation of the wireless device if the antenna identification code of the detachable antenna is a valid antenna identification code for the wireless device. The operation of the wireless device may additionally be disabled if it is subsequently determined that the detachable antenna connected to the wireless device is no longer a valid antenna or if it is determined that the detachable antenna has been previously used by another wireless device.

Abstract: Information is modulated onto frequency components of a signal. The resulting modulated signal includes at least some redundancy in frequency enabling a portion of the information modulated onto selected frequency components to be recovered from fewer than all of the selected frequency components. Controlling the spectrum of the modulated signal includes enabling the amplitude of at least some frequency components of the modulated signal to be set below a predetermined amplitude used for modulating the information.

Abstract: This disclosure describes techniques operating a client device to communicate with a wireless access point. The client device may awake from a low power mode of operation receive a first portion of a beacon from the access point that includes a delivery traffic identification (DTIM) message. According to the techniques described herein, the client device may determine, based on the DTIM message, whether or not one or more packets of data are forthcoming from the access point. If one or more packets of data are forthcoming from the access point, the client device may remain in an active mode of operation to receive the forthcoming packets (and/or a second portion of the beacon). However, if no packets of data are forthcoming from the access point, the client device may return to the low power mode of operation, before receiving and/or processing the second portion of the beacon.

Abstract: A TOA positioning system can be implemented that employs a calculated initial location of a wireless network device. For each of a plurality of reference wireless network devices, a distance between the wireless network device and the reference wireless network device is determined based, at least in part, on a round trip transit time between the wireless network device and the reference wireless network device. An initial location of the wireless network device can be calculated based, at least in part, on a location of each of the plurality of reference wireless network devices. A location of the wireless network device can be estimated based, at least in part, on the calculated initial location, the distance to each of the reference wireless network devices, and an initial distance calibration constant.

Abstract: A hybrid TDOA-TOA positioning system can be implemented to improve location estimation of a wireless network device. An initial location of the wireless network device can be calculated based on locations of a plurality of reference network devices. An intermediate location of the wireless network device can be determined based, at least in part, on the initial location of the wireless network device and distance differences between the wireless network device and each pair of the reference network devices. A second intermediate location of the wireless network device and a distance calibration constant can be calculated based on the locations of the reference network devices, the intermediate location, and/or round trip transit times between the wireless network device and each reference network device. The location of the wireless network device can be iteratively estimated based, at least in part, on the second intermediate location and the distance calibration constant.

Abstract: A TDOA positioning system that employs a calculated initial location of a wireless network device can be implemented to minimize sensitivity to the initial location of the wireless network device. For each pair of a plurality of reference network devices, the wireless network device can determine a distance difference between itself and the pair of the plurality of reference network devices based, at least in part, on round trip transit times between the wireless network device and the plurality of reference network devices. The initial location of the wireless network device can be calculated based on a location of each of the plurality of reference network devices. A location of the wireless network device can be estimated based on the calculated initial location of the wireless network device, the distance differences, and the location of each of the plurality of reference network devices.

Abstract: A method of determining a distance between a first wireless device and a second wireless device is provided. In this method, a location symbol can be generated by filtering and modulating a pseudorandom (PRN) code. The location symbol can be provided in a data field of a legacy wireless packet to form a first location packet. The first location packet can be transmitted from the first wireless device to the second wireless device. A second location packet can be transmitted from the second wireless device to the first wireless device, wherein the second location packet is substantially identical to the first location packet. An effective roundtrip time between the first and second wireless devices can be determined based on the first and second location packets. The distance between the first and second wireless devices can be computed using this roundtrip time.