Abstract: A method for maintaining an accurate channel estimate. The method includes providing a reference channel estimate based on at least one long training symbol, and generating a frequency domain representation of a first data symbol including a plurality of pilots. The method then includes tracking phase change in the plurality of pilots of the first data symbol relative to pilots of the at least one long training symbol to produce correction factors, and adjusting the reference channel estimate based upon the correction factors.

Abstract: A method for detecting a false detection of a packet. The method includes generating a frequency domain representation of a signal, the frequency domain representation including a plurality of complex values each of which is associated with a subcarrier. The method also includes determining an angle for each of the subcarriers, and determining for each pair of adjacent subcarriers an angle difference. The method then includes accumulating the angle differences to produce an accumulated angle, and detecting the false detection based upon the accumulated angle.

Abstract: A brain machine interface for decoding neural signals for control of a machine is provided. The brain machine interface estimates and then combines information from two classes of neural activity. A first estimator decodes movement plan information from neural signals representing plan activity. In one embodiment the first estimator includes an adaptive point-process filter or a maximum likelihood filter. A second estimator decodes peri-movement information from neural signals representing peri-movement activity. Each estimator is designed to estimate different aspects of movement such as movement goal variables or movement execution variables.

Abstract: A fast-tracking discrimination approach provides rapid acquisition useful for direct-sequence spread spectrum applications. In one example embodiment, the present invention is directed to a communication system receiver that operates a linearly normalizing discrimination process on a signal modulated by a waveform having a bit rate defined in terms of a bit-pulse duration (chip). For at least one reference code, correlation results are obtained from several timing offsets of the signal, where each timing offset is separated by a fixed chip offset. Using at least three consecutive ones of these correlation results, assuming that the correlation energy of band-limited signals is approximately quadratic, an accurate phase error is obtained for synchronizing the received signal.

Abstract: A method for maintaining an accurate channel estimate. The method includes providing a reference channel estimate based on at least one long training symbol, and generating a frequency domain representation of a first data symbol including a plurality of pilots. The method then includes tracking phase change in the plurality of pilots of the first data symbol relative to pilots of the at least one long training symbol to produce correction factors, and adjusting the reference channel estimate based upon the correction factors.

Abstract: A method for detecting a false detection of a packet. The method includes generating a frequency domain representation of a signal, the frequency domain representation including a plurality of complex values each of which is associated with a subcarrier. The method also includes determining an angle for each of the subcarriers, and determining for each pair of adjacent subcarriers an angle difference. The method then includes accumulating the angle differences to produce an accumulated angle, and detecting the false detection based upon the accumulated angle.

Abstract: A method for decompressing compressed data elements, drawing that decompression operation, the intermediate coefficients are organized in a matrix configuration such that the number of transpose operations are minimized. The organization of that matrix includes storing sequential coefficients, translated from the compressed data, in sequential locations of sequential columns of the matrix. The transpose operation is performed during the inverse discrete cosine operation portion of the decompression operation.

Abstract: In accordance with the present invention, a method and apparatus are provided for efficiently transmitting data between stages of a decompression pipeline by implementing a control store register for minimizing the amount of data that is transferred among decompression units. The control store register is a register having memory locations that are associated with decompressed coefficients. As the coefficients are decompressed, a determination is made as to whether they contain zero or non-zero values. The result of that determination is stored in the control store register such that the processor performing the inverse quantization and inverse discrete cosine operations only retrieves non-zero coefficients. Therefore, data transmission is performed in an efficient manner.

Abstract: A DC--DC switching regulator which converts a supplied DC voltage V.sub.DD to a DC output voltage V.sub.OUT for driving a load using a DC--DC buck converter operated with fixed-width pulses V.sub.X at an instantaneous switching rate n.sub.i. The regulator has a feedback for computing a subsequent switching rate n.sub.i+1 based on the instantaneous switching rate n.sub.i, an output frequency f.sub.OUT derived from output voltage V.sub.OUT by a ring oscillator and a desired frequency f.sub.DES provided by a frequency signaling device or a frequency signaling port of the load. By altering the desired frequency f.sub.DES the load communicates its power needs. The regulator can be used in the low-power regime and at high power levels.