Abstract: A method and apparatus for computing position using a regional-terrain model is provided. The method includes obtaining from at least three satellites pseudorange measurements, computing a transitional position by using a default altitude with a large uncertainty, using this transitional position to obtain from a terrain model altitude information associated with a region, and computing an accurate three-dimensional position as a function of the pseudorange measurements and the altitude information. The region defines a boundary, and the boundary includes the transitional position.

Abstract: A digital to analog conversion (DAC) module includes a digital to analog converter, a sample and hold circuit, and a switch module. The digital to analog converter is coupled to convert a digital signal into an analog signal. The sample and hold circuit is coupled to sample the analog signal to produce a sampled analog signal. The switch module is coupled to provide the analog signal as an output of the DAC module when the DAC module in a first mode and to output the analog signal to the sample and hold circuit when the DAC module in a second mode, wherein the sampled analog signal provides the output of the DAC module in the second mode.

Abstract: A network device includes at least one first network port, at least one second network port, a MUX unit and a switching unit. The MUX unit is connected to the at least one first network port. The MUX unit includes a trunk circuit and an output. The trunk circuit is configured to aggregate data packets received at the at least one first port into a trunk group and to output trunked data packets to the output. The switching unit is connected to the output of the MUX unit and to the at least one second network port. The switching unit is configured to switch the trunked data packets to the at least one second network port.

Abstract: A premises based multimedia communication system includes a source device that produces multimedia content, a rendering device that presents the multimedia content, and a premises communication network coupling the source device to the rendering device. The system certifies transfer of the multimedia content from the source device to the rendering device via the at least one premises communication network using link layer encryption operations. After certification, the system at least partially disables the link layer encryption operations for the transfer of the multimedia content from the source device to the rendering device via the at least one premises communication network. With the link layer operations are at least partially disabled, the system at least partially enables content layer encryption operations for the transfer of the multimedia content from the source device to the rendering device via the at least one premises communication network.

Abstract: A single carrier cable modem can be initialized on multiple channels. By initializing a cable modem on more than one channel, the error rate performance of short data packets in cable modems in an impulsive noise environment is improved. The advantage of low symbol rate transmission for short packets in an impulse noise environment is achieved without sacrificing burst capacity at a cable modem and without the complexity of transmitting multiple symbol waveforms simultaneously at a cable modem.

Abstract: A system and method for parallelization of saturated accumulation is provided. In the method, an input sequence is divided into a plurality of subsequences. For each subsequence, three parallel saturating additions are performed. The local saturation minimum is the saturating addition of the global saturation minimum and the values of the subsequence. The local midpoint is the saturating addition of the values of the subsequence and the local saturation maximum is the saturating addition of the global saturation maximum and the values of the subsequence. In embodiments, the accumulation total for a subsequence is calculated as the saturating addition of the accumulation total for prior subsequences and the local midpoint of the current subsequence, wherein the accumulation total of the last subsequence is the result of the saturated accumulation for the sequence. In another embodiment, the saturated addition of subsequence results are further parallelized before the final result is reached.

Abstract: A premises based multimedia communication system includes a source device that produces multimedia content, a rendering device that presents the multimedia content, and a premises communication network coupling the source device to the rendering device. The source device receives data packets carrying the multimedia content from the remote content source via at least one remote delivery communication network and transmits at least two copies of the data packets carrying video frames of the multimedia content to the rendering device via the at least one premises communication network. The rendering device decodes video frames carried by first copies of the data packets.

Abstract: A network device connected to a network includes a physical port and multiple logical ports configured to provide guest access or authenticated access to the network via the physical port, to a supplicant device. An authorization engine determines whether the supplicant device is authorized to access the network. An authentication engine determines whether the supplicant device is compatible with an authentication protocol associated with the network based on a receipt or a non-receipt of a response from the supplicant device to one or more authentication requests. A guest table stores the source address of the supplicant device if the supplicant device is authorized to access the network and is incompatible with the authentication protocol, wherein the logical ports are configured to provide the guest access to the supplicant device corresponding to the source address stored in the guest table.

Abstract: Provided is a method and system for transmitting MPEG frames between a DOCSIS based satellite modem termination system (SMTS) and a corresponding satellite modem (SM) system. The method includes identifying at least one data stream requiring transmission between the SMTS and the SM, the data stream including one or more MPEG frames. Next, the MPEG frames are organized within SMTS data queues based upon predetermined parameters and then transmitted based upon their organization within the data queues.

Abstract: A network device for selecting a port from a trunk group to transmit a unicast packet on the selected port. The network device includes at least one trunk group including a plurality of physical ports. The network device also includes a table with a plurality of entries. Each entry is associated with one trunk group and includes a plurality of fields that are associated with ports in the trunk group. Each entry also includes a hash field that is used to select bits from predefined fields of an incoming unicast packet to obtain an index bit for accessing one of the plurality of fields. The network device further includes transmitting means for transmitting the unicast packet to a port associated with an accessed one of the plurality of fields.

Abstract: A single chip radio transceiver includes circuitry that enables received wideband RF signals to be down converted to base band frequencies and base band signals to be up converted to wideband RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry includes a low noise amplifier, automatic frequency control circuitry for aligning the LO frequency with the frequency of the received RF signals, signal power measuring circuitry for measuring the signal to signal and power ratio and for adjusting frontal and rear amplification stages accordingly, and finally, filtering circuitry to filter high and low frequency interfering signals including DC offset.

Abstract: Optimal synchronization mark/address mark construction. These marks can generally be referred to as sync marks. A novel means is presented by which sync marks can be generated for use within a variety of communication systems including HDD systems. The sync marks generated hereby have a largest possible minimum distance measurement that ensures highly accurate detection of the transition between the data portion and the preamble portion of information that is processed. Various types of distance measurement criteria can be employed, including a Euclidean distance measurement or a Hamming distance measurement, when selecting the sync mark from among a plurality of possible sync marks.

Abstract: A direct conversion satellite tuner is fully integrated on a common substrate. The integrated tuner receives an RF signal having a plurality of channels and down-converts a selected channel directly to baseband for further processing. The integrated tuner includes on-chip local oscillator generation, tunable baseband filters, and DC Offset cancellation. The integrated tuner can be implemented in a completely differential I/Q configuration for improved electrical performance. The entire direct conversion satellite tuner can be fabricated on a single semiconductor substrate using standard CMOS processing, with minimal off-chip components. The tuner configuration described herein is not limited to processing TV signals, and can be utilized to down-convert other RF signals to an IF frequency or baseband.

Abstract: A method of installing multiple over-the-air antennas is disclosed. The method includes the steps of mounting a satellite antenna to a installation surface, such that the mounting allows the satellite antenna to be aimed at a satellite, attaching a broadband access antenna to one of the installation surface and a portion of the satellite antenna, such that the attaching allows the broadband access antenna to be aimed at a broadband access source, connecting first wiring from the broadband access antenna to a first downconverter and second wiring from the satellite antenna to a second downconverter, providing outputs of the first and second downconverters to a cable in communication with at least a satellite receiver and positioning, on at least a coarse scale, the satellite antenna and the broadband access antenna such that they are approximately pointed at the satellite and the broadband access source, respectively.

Abstract: A network switch having at least one port data port interface, a first memory, a second memory, and a memory management unit in connection with the at least one data port interface, the first memory, and the second memory. The memory management unit operates to receive data from the at least one data port interface, determine if the data is to be stored in one of the first memory or the second memory, store the data in one of the first memory or the second memory as a linked list, retrieve the data from one of the first memory or the second memory, and forwards the data for egress.

Abstract: A system and method for facilitating the authentication of wireless devices in an environment with multiple wireless networks. A user wishing to join an operating wireless network can bring his wireless device within close physical proximity, for example, less than one meter, of a device in the network that he wishes to join. The user then presses an authenticate button, which causes both devices to enter a low transmission power mode. In such case, the devices are only capable of operation within the close proximity. Being in low power mode will diminish the possibility of eavesdropping on the authentication process. Power down mode also reduces the amount of message traffic in the area and saves scarce power and processing resources at the nodes, which are now out of range. Authentication then takes place in low power mode and once completed, both devices resume normal power levels and continue communicating normally.

Abstract: In a wireless communication system, a multi-source data multiplexing system (e.g., a media access control (MAC)) accepts information packets from a plurality of signal sources, evaluates the relative efficiencies of data transmission, and transmits the information packets in provided grant regions for maximum efficiency. The multi-source data multiplexing system may accept any form of information packet from any form of signal source. The system receives a grant region, typically including a transmission time on a data channel, and inserts an information packet into the grant region. The actual information packet placed in the grant region may be one other than the packet for which the grant region was intended. Further, the multi-source data multiplexing system may fragment an information packet and transmit only a portion of the information packet in the grant region.

Abstract: Methods are disclosed for indirectly monitoring and controlling at least one media peripheral device in a media exchange network by accessing a media management system (MMS) via a first media peripheral (MP) device (e.g., a TV screen) using a user control device (e.g., a remote control). An operation corresponding to a second media peripheral (MP) device (e.g., a digital camera) may be selected via the MMS using the first MP device and the user control device. The operation is then carried out (i.e., performed) by the second MP device. A status of the second MP device may be selected via the MMS using the first MP device and the user control device. The selected status is then displayed on the first MP device.

Abstract: A method and apparatus are disclosed for efficiently de-scrambling and bit-order-reversing one or more bytes of data according to DSL standards on a processor. In a preferred embodiment, this is achieved by providing an instruction for de-scrambling and bit-order-reversing one or more bytes of data according to DSL standards. Accordingly, the invention advantageously provides a processor with the ability to de-scramble and bit-order-reverse data with a single instruction thus allowing for more efficient and faster de-scrambling operations for subsequent processing.

Abstract: A system and method for the secure storage of executable code and the secure movement of such code from memory to a processor. The method includes the storage of an encrypted version of the code. The code is then decrypted and decompressed as necessary, before re-encryption in storage. The re-encrypted executable code is then written to external memory. As a cache line of executable code is required, a fetch is performed but intercepted. In the interception, the cache line is decrypted. The plain text cache line is then stored in an instruction cache associated with a processor.