Abstract: A method of varying the power output of a transmitter. The method includes providing bit-loading information associated with each tone of multiple tones, where the multiple tones include a first set of tones. The method also includes producing, for transmission, on the first set of tones a first set of constellation symbols based upon the bit-loading information. The method also includes producing a second set of constellation symbols for transmission, where there is a difference of n bits between the bit size of the second bit sequence constellation symbol on each tone of the second set of tones and the bit-loading information associated with each tone of the first set of tones, and where n is an integer greater than or equal to 0.

Abstract: A method, system and apparatus for executing a boot loader for an embedded system including a system-on-chip (SOC) processor coupled to a memory including first boot loader code for implementing a first boot loader stored in a first sector and second boot loader code for implementing a second boot loader stored in a second sector determines which of the first boot loader code and second boot loader code is younger; if the second boot loader code is determined to be younger than the first boot loader code, a swapping operation is performed so that the second boot loader code is associated with the first sector and the first boot loader code is associated with a different sector, and the boot loader code associated with the first sector is executed.

Abstract: A method to reduce memory requirements for a packet loss concealment algorithm in the event of packet loss in a receiver of pulse code modulated voice signals. A voice playout unit in the receiver shares its nominal delay buffer with a history buffer of a packet loss concealment algorithm up to a maximum limit described in a standard. This reduces or eliminates need to allocate memory for the history buffer. A history buffer can also be extended to retain an original portion of voice signal packets received prior to a packet loss as well as generated voice signals as they are generated. A scratch buffer is used as a working buffer and replaces the function of a pitch buffer.

Abstract: A circuit includes a generating circuit that generates a current signal in response to an input signal, a first one of a plurality of integrators that generates a voltage signal from the current signal, a comparator that is responsive to the voltage signal to compare the voltage signal with a predefined voltage, a switching circuit that reconfigures a first capacitor and a second capacitor connected to the first one of the plurality of integrators to discharge the first capacitor and to enable the second capacitor to generate the voltage signal in response to the current signal, and an analog-to-digital converter to generate an output when a predefined time interval has elapsed. The output is obtained by adding a first charge value corresponding to a count of number of times the voltage signal reaches the predefined voltage in the predefined time interval and a second charge value from the analog-to-digital converter.

Abstract: Embodiments of the invention provide methods to calculate compression noise statistics of decompressed images in transform coding. They can be used in compressed image quality assessment, compression algorithm optimization, compression noise reduction, and other quantization and compression related applications.

Abstract: A system and method of flexible channel allocation in an ultra wideband frequency hopping communication system is disclosed. In one embodiment, a method includes communicating radio signals through rapidly switching among a band group 6 according to a hopping pattern. The method also includes scanning the ultra wideband spectra to determine the band group 6 based on the hopping pattern of the radio signals. In another embodiment, a method includes scanning ultra wideband spectra to eliminate any frequency band of the ultra wideband spectra from a list of available frequency bands when the any frequency band is currently used, selecting a band group in combination of two or more frequency bands to communicate radio signals with an optimal transmission power and/or maximum range, and communicating the radio signals through rapidly switching among the band group.

Abstract: The present invention provides a versatile system for selectively spreading carrier data across multiple carrier paths within an Orthogonal Frequency Division Multiplexing (OFDM) system, particularly an ultra-wideband (UWB) system. The present invention provides a data input, which passes data to a randomizer. The data then passes to a convolutional code function, the output of which is punctured by puncturing function. An interleaver function receives the punctured code data, and cooperatively operates with a mapper element to prepare the coded data for pre-transmission conversion by an IFFT. The mapper element comprises a dual carrier modulation function, which associates and transforms two punctured code data elements into a format for transmission on two separate signal tones.

Abstract: In some embodiments, a device includes a multiple-input multiple-output (“MIMO”) decoder module coupled to a first log-likelihood-ratio (“LLR”) computing unit. The decoder module includes at least one processing unit and at least one sorting unit. The decoder module preferably uses a K-best breadth-first search method to decode data from MIMO sources. In some embodiments, a method includes receiving data representing a vector of receive signal samples detected by multiple receive transceivers. The method further includes performing a K-best breadth-first search on the data to obtain an estimated constellation point. The method further includes providing a user data stream based at least in part on the estimated constellation point.

Abstract: Embodiments of the invention provide a method for selectively identifying nodes implemented enhanced version of a standard by creating a random locally administered MAC address and advertising said random locally administered MAC address as the address that implies a particular amendment of a standard.

Abstract: In one aspect, a digital device comprises a wireless station, a universal serial bus (USB) port, a memory, and a processor. The processor is configured to detect a coupling of a flash device to the USB port and obtain wireless network configuration information from the flash device. The wireless network configuration information comprises a network name and a security key for a wireless communications network. The processor is further configured to store the wireless network configuration information in the memory, configure the wireless station using the wireless network configuration information, and connect the wireless station to the wireless communications network based on the wireless network configuration information.

Abstract: Several methods and a system of noise limitation of a signal dependent multibit digital to analog signal conversion are disclosed. An exemplary embodiment provides a method that includes receiving an output of a multibit analog to digital circuit of a continuous time sigma delta converter. The method further includes limiting a noise generation by adaptively selecting a digital to analog converter element out of a plurality of digital to analog converter elements in accordance with an input signal magnitude. In addition, the method includes implementing a selected digital to analog converter element to generate an analog signal.

Abstract: An amplifier circuit to amplify a sequence of echoes and to generate a corresponding sequence of amplified signals. In an embodiment, the amplifier includes an operational amplifier, with variable input and feedback resistances such that the ratio of the two resistances can be controlled. A gain control block controls the ratio in a time dependent manner to obtain desired gain factors for each of the echoes. The gain factors can be pre-computed such that all the echoes are gained to the same level in case of an ultra-sound system.

Abstract: One embodiment of the present invention includes a method for adaptively estimating available upstream bandwidth in a network. The method comprises monitoring data indicative of a number of lost packets at a near-end communication device. The data indicative of a number of lost packets can be periodically transmitted from a far-end communication device. The method also comprises increasing an amount of upstream bandwidth transmission until the monitored data exceeds a threshold. The method also comprises calculating an estimated available upstream bandwidth based on a portion of a maximum amount of the upstream bandwidth transmission.

Abstract: System and method for increasing the frequency tuning range of a RF/microwave LC oscillator. A preferred embodiment comprises a voltage controlled oscillator (VCO) configured to generate an output signal at a frequency that is dependent upon a magnitude of an input voltage level and an effective inductance of an inductive load and a variable inductor coupled to the VCO. The variable inductor comprises a primary inductor coupled to the VCO to produce a magnetic field based upon a current flowing through the primary inductor and a secondary inductor magnetically coupled to the primary inductor, the secondary inductor to affect the magnitude of the effective inductance of the primary inductor.

Abstract: The present invention is directed to a time-switched preamble generator and method of generating a time-switched preamble for use with a multiple-input, multiple-output (MIMO) transmitter employing first and second transmit antennas. In one embodiment, the time-switched preamble generator includes an initial preamble formatter configured to provide a first preamble to the first transmit antenna and a second preamble to the second transmit antenna during an initial time interval. The time-switched preamble generator also includes a subsequent preamble formatter coupled to the initial preamble formatter and configured to provide the second preamble to the first transmit antenna and the first preamble to the second transmit antenna during a subsequent time interval.

Abstract: A voltage to current converter that can provide multiple current sources at differing voltage levels using a single inductor, without the need to provide a current sense element, pass element, and wiring to provide feedback for load current regulation. A switching inductor current is regulated such that the average current supplied by the inductor is equal to a user determined set point or points for a set of multiplexed loads. The inductor current levels are sampled and stored, and the average current level for each load is determined based on the sampled current levels. The average current levels are compared to a current level set point or set point signals to determine an error signal for each load current. The error signal for each current is amplified and filtered to provide duty cycle control terms. The duty cycle control terms are converted to pulse width modulated control signals by a pulse width modulator.

Abstract: Flooding in an Ethernet bridge can be minimized by employing various techniques. In one embodiment using an address table containing a plurality of entries, each of said plurality of entries specifying one of said plurality of ports on which packets containing a corresponding destination address are to be forwarded. A priority field associated with a high priority first entry is maintained. A new entry creation situation is determined and a replacement approach which is less likely to replace said first entry than another entry which does not have associated high priority field is utilized.

Abstract: System and method for providing multiple access in a multi-band, orthogonal frequency division multiplexed (multi-band-OFDM) communications system. A preferred embodiment comprises determining a transmission bandwidth to support a performance requirement and configuring transmission bands in the multi-band-OFDM communications system based upon the transmission bandwidth, wherein the transmission bands may be made up of smaller transmission bands bonded together. Further comprising initializing communications with the configured transmission bands. The use of bonded transmission bands can provide increased data rates and/or increased range performance.

Abstract: In at least some embodiments, a communication device includes a plurality of network technology subsystems, each subsystem associated with a different network technology. The communication device also includes a controller coupled to the plurality of network technology subsystems. The controller enables coexistence of the different network technologies in accordance with at least one monitored quality of service (QoS) parameter.

Abstract: A method of adjusting overlap-and-add length for zero-padded suffixes. The method includes, based on a channel impulse response, estimating an effective channel length. When the effective channel length is less than a default overlap-and-add length and greater than a minimum length, the method includes setting the overlap-and-add length to the effective channel length. When the effective channel length is less than the minimum length, the method includes setting the overlap-and-add length to the minimum length. When the effective channel length is greater than the default overlap-and-add length, the method includes setting the overlap-and-add length to the default overlap-and-add length.