120 results about "Fir system" patented technology

A method and an apparatus provide intelligent monitoring and maintenance of a system. The method according to one embodiment accesses data relating to functional components of the system; extracts parameter information for functional components of the system, the step of extracting parameter information including performing inferential processing and trend recognition of the data using previous knowledge about the system, and simulating performance of the system using models of the system and previous knowledge about the system; identifies new information about the system present in extracted parameter information; and provides the new information to the step of extracting parameter information, to be used as previous knowledge.

The invention provides a generic and comprehensive architecture to optimise several space-time adaptive algorithms and their applications for both CCI and ISI interference cancellation for MIMO systems. The basic idea of this invention is to optimise space-only processes and time-only processes and their combination to take account of the varying affects of CCI and ISI in a given environment. This maximises the efficiency of adaptive algorithms. The invention is targeting on unknown CCI or co-antenna interference of other operating system at the same frequency band.

The I/O circuit of the present invention provides optimal flexibility and performance using a number of different structures and methods. The present invention provides a signal follower circuit for an input pad. In one embodiment, the output buffer is capable of injecting a constant onto a pad during reconfiguration of a configurable system logic circuit. The present invention also provides a circuit for generating a programmable data propagation delay, thereby guaranteeing zero hold time for an arbitrary input register. Zero hold time is accomplished by allowing the user to optimally characterize clock delay to a given input/output circuit. The present invention also provides fast switching between input pads, thereby minimizing data propagation delay between the input pads. Additionally, the present invention reduces time spent in production product test by facilitating the testing of multiple routes with one test configuration. A circuit expanding the number of data input channels available to system routing is provided. Lastly, a plurality of identical input/output block tiles (IOBTs) is disclosed, thereby enabling each I/O circuit to provide the same signals regardless of the IOBTs location in the I/O circuit.

Dynamic voltage and frequency scaling (DVFS) is an effective way to reduce energy and power consumption in microprocessor units. Current implementations of DVFS suffer from inaccurate modeling of power requirements and usage, and from inaccurate characterization of the relationships between the applicable variables. A system and method is proposed that adjusts CPU frequency and voltage based on run-time calculations of the workload processing time, as well as a calculation of performance sensitivity with respect to CPU frequency. The system and method are processor independent, and can be applied to either an entire system as a unit, or individually to each process running on a system.

The invention is directed to a system and methods for automatically determining a multiple number of viable treatment plans for correcting a patient's vision via photoablative refractive surgery. Embodiments of the invention rely on selected various diagnostic input about the patient's eye to classify the eye as being particularly suitable for treatment by several different treatment algorithms. The invention is further directed to the simultaneous presentation of various treatment plans based upon selected input data and available treatment algorithms that can be reviewed, modified, and ultimately selected for application. A system embodiment according to the invention includes a component for receiving the diagnostic input data about the patient's vision, for analyzing the input data and determining the potentially usable treatment algorithms, and for processing the potentially usable treatment algorithms based upon the input data, and a component for displaying the multilevel graphical user interface which facilitates review, modification, and selection of viable treatment plans for correcting the patient's vision. The system is further operably associated with a storage medium for storing calculated and selected treatment plans which include executable instructions for a photoablative laser component of the system to deliver a selected treatment plan to the patient's eye.

A symbol boundary detection device and a method thereof for use in a receiver of a multi-channel communication system. The device utilizes a threshold to make an auxiliary judgement so as to select a proper symbol boundary reference point within an early range. The threshold may be flexibly set in response to different characteristics of the systems. In addition, a pilot symbol guard interval matched filter is further utilized to determine whether a pilot symbol guard interval is received.

A free space optical switch that uses both an open loop control mode and a closed loop control mode. The open loop control mode is used to transition to a state where at least some light is sensed at a destination port. A closed loop control mode is then used, whereby a series of controlled dither signals are adjusted for system dynamics. Modifying the dither signals in this matter allows moving actuators at a rate that is much closer to the natural frequency of the underlying system, and hence speeds up the system convergence process. Variable modulation amplitudes may be employed on the dither signals to maximize convergence speed. In particular, changes in the dither signal can be made in accordance with the change in amplitude as a function of a gradient along a parabola that models the optical system response. According to still further aspects, the dither signals may be compensated for a desired and selectable attenuation level of output optical power.

For eigenmode transmission with minimum mean square error (MMSE) receiver spatial processing, a transmitter performs spatial processing on N_S data symbol streams with steering vectors to transmit the streams on N_S spatial channels of a MIMO channel. The steering vectors are estimates of transmitter steering vectors required to orthogonalize the spatial channels. A receiver derives a spatial filter based on an MMSE criterion and with an estimate of the MIMO channel response and the steering vectors. The receiver (1) obtains N_R received symbol streams from N_R receive antennas, (2) performs spatial processing on the received symbol streams with the spatial filter to obtain N_S filtered symbol streams, (3) performs signal scaling on the filtered symbol streams with a scaling matrix to obtain N_S recovered symbol streams, and (4) processes the N_S recovered symbol streams to obtain N_S decoded data streams for the N_S data streams sent by the transmitter.

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.

Techniques to adjust the setpoint of a power control loop in a wireless communication system. The setpoint may be adjusted based on frame status indicative of erased/good decoded frames, one or more (typically soft) metrics indicative of the confidence in the decoded results, power surplus/deficit indicative of the difference between the received signal quality and the setpoint, setpoint surplus/deficit indicative of the difference between the setpoint and a threshold E_b/N_t needed for the desired level of performance, or a combination thereof. The metrics may include re-encoded symbol error rate, re-encoded power metric, modified Yamamoto metric, minimum or average LLR among decoded bits, number of decoding iterations, and possibly others. The setpoint may be adjusted in different manners and/or by different amounts depending on the above-noted factors. The techniques may be employed for forward and/or reverse links in CDMA systems.

An error tracking apparatus and method for tracking a residual frequency error, a phase error, a timing error, and a signal amplitude variation to enhance a phase error tracking performance and a tracking speed in an orthogonal frequency division multiplexing (OFDM) system is provided. The error tracking apparatus and method include: a frequency error corrector for correcting a frequency at a time domain by adding a tracking carrier error estimating value to an initial carrier frequency error estimating value; a signal amplitude tracking corrector for controlling a signal amplitude by multiplying an input signal converted by a fast Fourier transform (FFT) by an output value corresponding to a calculated power of a receive pilot signal; a channel corrector for outputting a channel correcting signal by multiplying the receive pilot signal by a complex conjugate of a frequency channel response of the receive pilot signal; a carrier frequency error estimator for estimating a carrier frequency error parameter using the channel-corrected pilot and providing the tracking carrier frequency error estimating value; a time offset estimator for estimating a time offset parameter using the channel-corrected pilot; and a carrier phase error estimator for estimating a carrier phase error parameter using the channel-corrected pilot.

A unified minimum mean square error (MMSE) equalization/multi-user detection (MUD) approach for demodulating direct sequence CDMA (DS-CDMA) signals is described. In at least one embodiment, the unified approach is capable of generating a variety of cost-effective receiver demodulation techniques that may range from, for example, a low cost linear MMSE equalization technique to a relatively high complexity MMSE MUD.

The invention relates to an unmanned vehicle path tracking control method based on a soft constraint quadratic programming MPC. The method comprises the steps that firstly, a new reference path pointset Prset is calculated and established according to known reference path points; secondly, output from a kth sampling point to future Np sampling moments is predicted; thirdly, a control increment offuture Nc sampling moments is calculated by using an optimization method with soft constraint quadratic programming, and therefore a control amount at the current moment is obtained; finally, the control amount at the current moment is applied to a system, and the steps above are repeated until path tracking is completed. According to the method, through a rolling optimization strategy, global optimization is replaced by local optimization, feedback correction is conducted by utilizing actually-measured information, control parameters can be adjusted in the control process in real time, and path tracking is more accurate.

A receiver for a software defined radio system comprises an input stage for receiving a transmitted signal, an analogue-to-digital converter having a sample rate, a filter matched to the received transmitted signal, and a sample rate converter for converting the digital signal output from the filter from an input sequence having the sample rate of the analogue-to-digital converter to an output sequence having an output sample rate defined by the received transmitted signal. The input and output sequences comprise respectively a number of input samples and a number of output samples. A controller controls the output sample rate and a demodulator coupled to the output of the sample rate converter recovers the transmitted signal. The sample rate converter is implemented by a transposed Farrow structure. The controller is arranged to reset the output sequence from the sample rate converter when any one of said number of input samples and any one of said number of output samples pass through coincidence in time.

To provide a base station capable of selecting an optimum beam from among transmitted ones of multi-beams. In the arrangement, a beam power determining part (4) determines M received signal powers of multi-beams, and a beam output selecting part (5) selects, based on the information of the received powers from the beam power determining part (4), a beam of the largest power from among M outputs of beam formers (31-3M), and receives the selected beam. A transmission weight generating part (6) selects, based on the received information, a beam corresponding to the signal of a spread code selected by a mobile station and also selects another any beam to notify their respective transmission weighting coefficients. A transmitted beam forming part (7) weights transmitted data corresponding to transmission array antenna elements (91-9N) with the transmission weighting coefficients. Spreaders (81,82) use respective different spread codes to spread input signals, and the transmission array antenna elements (91-9N) send the beam-formed signals.

The adaptive filter for system identification is an adaptive filter that uses an algorithm in the feedback loop that is designed to provide better performance when the unknown system model has sparse input, i.e., when the filter has only a few non-zero coefficients, such as digital TV transmission channels and echo paths. In a first embodiment, the algorithm is the Normalized Least Mean Square (NLMS) algorithm in which the filter coefficients are updated at each iteration according to:

where the step size μ is varied according to μ(i+1)=αμ(i)+γ|e(i)|. In a second embodiment, the algorithm is a Reweighted Zero Attracting LMS (RZA-LMS) algorithm in which the filter coefficients are updated at each iteration according to:

where the step size μ is varied according to μ(i+1)=αμ(i)+γ|e(i)|. The adaptive filter may be implemented on a digital signal processor (DSP), an ASIC, or by FPGAs.

In a wireless communication device which is transportable between plural geographic region, wherein each geographic region has preferred and non-preferred communication systems for the wireless communication device, a method of selecting an appropriate communication system, including providing the wireless communication device with a non-PRL system table for storing acquisition parameters, including a communication system identification, a band class designation for a band class, a channel designation for a channel in the band class, and geographic region identification; making entries in the non-PRL system table when the wireless communication device acquire an appropriate channel in a geographic region; searching the non-PRL system table when the wireless communication device next changes geographic regions; and selecting a communication system based on the acquisition parameters in the non-PRL system table as a result of the searching.

A synchronization apparatus and method for an OFDM system includes four portions: delay conjugate multiplication, phase processing, delay moving sum and minimum value detection. The invention performs the correlation phase operation and finds out the location of abnormal change for the phase difference of the output signal. The location is used for the reference of symbol synchronization. It overcomes the problems of incorrect judge about synchronization location due to the channel fading or noise. The invention can be applied to wire/wireless communications or digital video broadcasting-terrestrial systems, specialized in symbol synchronization at a receiving end.

Techniques for facilitating and reducing the costs associated with the installation of a wireless broadband communications system. In one mode of operation, the system employs a first transceiver to identify n channels having the n lowest levels of noise and interference associated therewith by a spectrum management technique. Next, the first transceiver transmits a predetermined code over the n channels to a second transceiver, which attempts to identify the predetermined code within a captured transmission. In the event the code is correctly identified, the second transceiver measures a noise and/or interference level associated with the corresponding channels. The channel having the lowest measured noise and interference level is then selected for use in system installation.