Abstract:
The invention provides improved CDMA, WCDMA or other spread-spectrum communication systems of the type (fig. 1) that processes one or more spread-spectrum waveforms, each representative of a waveform received from a respective user. The improvement is characterized by a first logic element (100) that generates a residual composite spread-spectrum waveform (112) as a function of an arithmetic difference between a composite spread-spectrum waveform for all users and an estimated spread-spectrum waveform for each user. It is further characterized by one or more second logic elements (118, 120) that generates for at least a selected user, a refined spread-spectrum waveform as a function of a sum of the residual composite spread-spectrum waveform and the estimated spread-spectrum waveform for that user.
Abstract:
According to exemplary embodiments, a controlled-depth slot extending into a circuit board is provided. The controlled depth slot may be milled, and may comprise ½ radial plated through-holes to generate a solderable "D" interconnect feature. The slot may include interconnect features on one to five sides. According to another exemplary embodiment, a circuit board having a depth-controlled interconnect slot is provided in conjunction with one or more solderable technology modules. The one or more solderable technology modules may include memory devices, power devices such as Point of Load Supplies (POLS), security devices and anti-tamper devices, capacitance devices, and other types of chips such as Field Programmable Gate Arrays (FPGAs). The solderable technology modules may be soldered into the slot to secure the modules in the slot and connect the modules to interconnects on the circuit board.
Abstract:
A terrain database that is rendered in three-dimensional perspective on a Synthetic Vision display in a moving vehicle is updated in real-time in response to data from a ranging sensor. The updated database may be stored and shared with users of displays in other vehicles.
Abstract:
The invention provides methods and apparatus for multiple user detection (MUD) processing that have application, for example, in improving the capacity CDMA and other wireless base stations. One aspect of the invention provides a multiprocessor, multiuser detection system for detecting user transmitted symbols in CDMA short-code spectrum waveforms. A first processing element generates a matrix (hereinafter, "gamma matrix") that represents a correlation between a short-code associated with one user and those associated with one or more other users. A set of second processing elements generates, e.g., from the gamma matrix, a matrix (hereinafter, "R-matrix") that represents cross-correlations among user waveforms based on their amplitudes and time lags. A third processing element produces estimates of the user transmitted symbols as a function of the R-matrix.
Abstract:
Various embodiments provide a circuit board module include a primary cover, a secondary cover and a circuit board sandwiched between the primary cover and the secondary cover. A first set of fins or channels may be provided on a surface of the primary cover. The first set of fins or channels guide cooling air flowing on the surface of the primary cover. A second set of fins or channels may be provided on a surface of the second cover. The second set of fins or channels guide the cooling air flowing on the surface of the secondary cover. The second set of fins or channels intermates with the first set of fins or channels to form a sealed casing enclosing the circuit board. The sealed casing forms a Faraday cage to protect the circuit board from electromagnetic interference.
Abstract:
A terrain database that is rendered in three-dimensional perspective on a Synthetic Vision display in a moving vehicle is updated in real-time in response to data from a ranging sensor. The updated database may be stored and shared with users of displays in other vehicles.
Abstract:
Various embodiments provide a circuit board module include a primary cover, a secondary cover and a circuit board sandwiched between the primary cover and the secondary cover. A first set of fins or channels may be provided on a surface of the primary cover. The first set of fins or channels guide cooling air flowing on the surface of the primary cover. A second set of fins or channels may be provided on a surface of the second cover. The second set of fins or channels guide the cooling air flowing on the surface of the secondary cover. The second set of fins or channels intermates with the first set of fins or channels to form a sealed casing enclosing the circuit board. The sealed casing forms a Faraday cage to protect the circuit board from electromagnetic interference.
Abstract:
The disclosure relates generally to a method of three dimensional (3D) tomographic volume reconstruction for computed tomography (CT) using vector processors and more specifically to an optimized implementation which pre-computes back projection weights and perspective geometry data associated with a given CT device as down-sampled tables. The down-sampled perspective geometry data and the weight table are interpolated dynamically as part of the volume reconstruction process for an object scanned using the given CT device.