Abstract: A method and apparatus is presented for detecting the presence of a packet being transmitted on a communications medium using self-correlation of samples taken from the communications medium. The method saves on power consumption by sampling the communications medium at a sampling rate that is lower than the sampling rate used for sampling the data in the packet. An unexpected result is achieved when packet detection performs better at the lower sampling rate than at the higher sampling rate.

Abstract: An access point in a wireless network transmits polling frames to node wherein the polling frame includes a traffic identifier (TID) value that corresponds to a particular stream or category of traffic. The polling frame prompts the receiving node to respond with its own data frames that correspond to the TID value. The node receiving the polling frame then responds to the polling frame with its own data frames that correspond to the TID value from the polling frame, if the node has any such frames with which to respond. Other features include the implementation priority levels that dictate which frames a node will transmit in response to the polling frame and a request traffic identifier (RTID) value that specifies whether or not the receiving node is to respond with frames that only correspond to the TID value in the polling frame.

Abstract: A method of transmit power adjustment in multitone communication systems is performed by changing a power spectral density for each subchannel k the power spectral density to the minimum of the power spectral density and a miximum of the power spectral density REFPSD(k)=min(NOMPSD(k), NOMPSD?PCB) where REFPSD(k) is the transmitted PSD at tone k, NOMPSD(k) is the maximum transmit PSD allowed at each tone k, NOMPSD is the maximum value of NOMPSD(k) over all k and PCB is a power cutback level.

Abstract: A method for reducing soft error rates in semiconductor memory. In one embodiment, memory is partitioned into a) boot and download memory, b) program memory and c) data memory. Each partition receives protection according to the importance of the data stored. The boot memory is protected by sensing errors and repairing them utilizing on-chip data storage redundancy and exchange. The program memory is protected by sensing errors and repairing damaged data by reloading it using the program stored in the boot and download memory. The data memory is selectively protected similar to the program memory, but with the added feature of regular saving to disk from which to check for accurate data in the event of corruption. In another embodiment, any or all of the soft error protection features are selectable on a global basis, a memory type basis or, in the cases of program and data memory, on a block level basis.

Abstract: Providing interpolated signals with enhanced signal-to-noise-ratio (SNR). In an embodiment, for each digital sample (of an analog signal) having strength Dn, N values are inserted, with the kth inserted value having a strength of Dn(1+/?Dk), wherein Dk is selected randomly from within a range set according to quantization noise. The received digital samples along with inserted digital values are provided as the interpolated signal corresponding to the input signal represented by the received digital samples.

Abstract: A first-order signal generator (135). The generator comprises a shift register (210?) having a number N of bit positions. Each bit position is operable to store a binary value, the shift register operable to shift the binary value at each of the bit positions. The generator also comprises circuitry for tapping selected ones of the bit positions and circuitry for applying a function (220?) to each binary value in the selected ones of the bit positions to provide a function output. The generator also comprises circuitry for coupling the function output as an input to one of the bit positions. Lastly, the generator also comprises circuitry (230?) for outputting a first-order noise signal by coupling, as a twos complement number, each binary value in a plurality of the bit positions.

Abstract: An overflow problem of LSF quantization in G.729 Annex B speech encoding which may lead to non-assignment of a codebook index. Preferred embodiments fix the problem with default or limited random variable assignments or flagging the overflow and adjusting the frame encoding such as by limiting spectral components or changing quantization targets.

Abstract: A method comprising encoding a plurality of signals according to a predetermined negation scheme and transmitting the plurality of signals, wherein each signal is transmitted by way of a wireless channel. The method further comprises receiving a signal, wherein the received signal is a combination of the plurality of transmitted signals, and interpolating between data in the received signal to generate a plurality of systems of equations. The method further comprises solving the plurality of systems of equations to determine a gain and phase shift applied to each of the plurality of transmitted signals by a corresponding wireless channel.

Abstract: An engineering model is described for a home gateway and interface system and method for providing quality of service to a home LAN device on a home network that is not QoS capable. The gateway comprises a modem (e.g., cable, DSL modem) and a portal service proxy interface. The modem is connected between the home network and a WAN cable network, and is operable to bridge traffic between the home LAN of the home network and the WAN cable network. The portal service interface is connected to the modem and is utilized as a proxy for QoS reservations and data communications between the home LAN devices on the home network. The portal interface acts on behalf of a client to make requests of the non-QoS capable home LAN devices and communicate these QoS needs to the QoS capable devices. The portal service interface is operable to manually input and obtain a set of QoS requirements of a client or user, for example, using a protocol such as the HTTP or Telnet protocol on a web browser.

Abstract: The present invention provides a time-switched preamble supplement generator for use with a multiple-input, multiple-output (MIMO) transmitter employing N transmit antennas wherein N is at least two. In one embodiment, the time-switched preamble supplement generator includes an initial preamble supplement formatter configured to provide a first permutation of a set of preamble supplements to the N transmit antennas during an initial time interval. The first permutation includes a single first preamble supplement and at least one second preamble supplement. The time-switched preamble supplement generator also includes a subsequent preamble supplement formatter coupled to the initial preamble supplement formatter and configured to provide (N?1) mutually exclusive further permutations of the set to the N transmit antennas during (N?1) subsequent time intervals.

Abstract: A system for scheduling access times for transmitting data traffic in a WLAN including both isochronous streams and asynchronous bursts characterized by widely varying parameter values generates a succession of service periods, each having adjustable length and including two or other number of primary access intervals. The service periods may also be adapted to include one or more asynchronous burst periods, each immediately following a primary access interval. Access times for each isochronous stream are scheduled only during a primary access interval, or an immediately following extension period. Asynchronous bursts are scheduled for access times only during asynchronous burst periods. Epoch lengths fluctuate dependent on the dynamic needs and priorities of user traffic. Thus, an access time scheduling is made available that can readily adapt WLAN access to continually changing data traffic conditions, and thereby provide QoS by scheduling access times accordingly.

Abstract: A communications receiver is provided that includes a first and second compensators a pilot tracker and a demodulator. The first compensator is operable to adjust an input signal based on both a coarse frequency offset and a fine frequency offset to produce an adjusted input signal. The pilot tracker determines an estimated residual frequency offset based on at least a portion of the adjusted input signal. The demodulator determines at least a first symbol sequence and a second symbol sequence based on the adjusted input signal. The second compensator is operable to adjust the first symbol sequence and the second symbol sequence based on the estimate residual frequency offset.

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: In at least some embodiments, a method for mitigating interference between an Ultra Wideband (UWB) device and a non-UWB device is provided. The method includes, dynamically determining if a frequency channel associated with the non-UWB device is being used. If the frequency channel is being used, the method adjusts a UWB frequency band used for UWB signal transmission.

Abstract: An interrupt control system is disclosed. The interrupt control system can include control logic that provides at least one interrupt request signal to a processor in response to at least one event signal. The control logic provides at least one computer executable instruction to a processor in response to detecting an instruction request from the processor corresponding to an interrupt response.

Abstract: System and method for providing clocks to digital circuitry with a need for multiple clocks. A preferred embodiment comprises an oscillator controller (oscillator clock domain block 305) distributes a system clock generated by an oscillator to a plurality of clock domain blocks (GSM clock domain block 310 and so forth). The clock domain blocks use the system clock to generate specific clocks needed by attached hardware. The clock domain blocks may be programmed after manufacture to permit customized clock generation to meet requirements.

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. Packet losses are concealed by using the spectral analysis filter memory to smooth a signal gap and by using a technique for determining a maximum repeatable waveform range instead of using the pitch period to reproduce lost packets. The invention uses fewer processing resources and results in improved performance compared to a packet loss concealment algorithm under G.711 Appendix I standards.

Abstract: A retry algorithm determines the maximum number of transmissions and retransmissions that may be attempted for the frame in the head of a transmit queue or transmit buffer that needs to be transmitted across a communications link. The algorithm attempts to achieve a constant delay for each packet in frame by taking into account the number of frames residing in the transmit queue, the number of transmit opportunities elapsed between the arrivals of two successive frames in the transmit queue s, as well as the buffering capabilities of both the transmitting and receiving sides. The transmission and retransmission control technique provides for a way of managing the TX and RX buffers with a size that is suitable for the application being used and the underlying transport network. The number of retries is adapted to incoming and outgoing data rate changes in order to provide a fixed delay wireless link transport and maximize effective channel utilization.

Abstract: An M-dimension M-PAM trellis code encoder, a method of encoding user bits and a decoder. In one embodiment, the encoder includes: (1) a convolutional encoder portion configured to encode at least two user bits into at least three coded bits and (2) a sublattice selector coupled to the convolutional encoder portion and configured to employ the at least three coded bits to select a particular sublattice of code alphabet elements and further to employ at least two additional user bits to select a particular code alphabet element in the sublattice.

Abstract: A system and method are provided for improving the throughput of wireless networks, such as IEEE 802.11 networks. Individual devices in the network determine the level of activity on the network. In the event that the network is active, the devices increase throughput by skipping the pending packet transmission and appending its data payload to a future packet transmission. By encoding multiple payloads in a single packet transmission, packet overhead is reduced and MAC layer delays are eliminated. The data payloads are subsequently split back into individual packets for transmission over the wired portion of the network.