摘要:
Significant improvement in Raptor codes and punctured LDPC codes are obtainable by use of the invention. In both a transmission scheme for Raptor-encoded or LDPC-encoded information, a dynamic adjustment approach is employed. A fraction of a codeword or information frame is transmitted. A feedback signal is sent from the receiver to the transmitter indicating either 1) successful decoding, or 2) failure to decode and/or a feedback signal indicative of a statistical measure of transmission channel quality. If decoding fails, a further portion of the codeword or frame is sent. The intensity and/or size of the fraction is adjusted based on the feedback signal. In one embodiment, a specific range for probabilities employed in the encoding process for Raptor codes provides the ability to increase transmission throughput. Further it has been found that the advantageous Raptor codes are useful in noise conditions where even the improved punctured LDPC codes of the invention begin to degrade.
摘要:
A system for, and method of, allowing conventional memory test circuitry to test parallel memory arrays and an integrated circuit incorporating the system or the method. In one embodiment, the system includes: (1) bit pattern distribution circuitry that causes a probe bit pattern generated by the memory test circuitry to be written to each of the memory arrays, (2) a pseudo-memory, coupled to the bit pattern distribution circuitry, that receives a portion of the probe bit pattern and (3) combinatorial logic, coupled to the pseudo-memory, that employs the portion and data-out bit patterns read from the memory arrays to generate a response bit pattern that matches the probe bit pattern only if all of the data-out bit patterns match the probe bit pattern.
摘要:
For use in a processor having an external memory interface, an instruction prefetch mechanism, a method of prefetching instructions and a digital signal processor incorporating the mechanism or the method. In one embodiment, the mechanism includes: (1) a branch predictor that predicts whether a branch is to be taken, (2) prefetch circuitry, coupled to the branch predictor, that prefetches instructions associated with the branch via the external memory interface if the branch is taken and prefetches sequential instructions via the external memory interface if the branch is not taken and (3) a loop recognizer, coupled to the prefetch circuitry, that determines whether a loop is present in fetched instructions and reinstates a validity of instructions in the loop and prevents the prefetch circuitry from prefetching instructions outside of the loop until the loop completes execution.
摘要:
For use in a wide-issue pipelined processor, a mechanism for, and method of, reducing pipeline stalls between conditional branches and a digital signal processor (DSP) incorporating the mechanism or the method. In one embodiment, the mechanism includes: (1) a mispredict program counter (PC) generator that generates a mispredict PC value for each conditional branch instruction in a pipeline of the processor and (2) mispredict PC storage, coupled to the mispredict PC generator, that stores the mispredict PC value at least until a resolution of the conditional branch instruction occurs and makes the mispredict PC value available to a PC of the processor if the resolution results in a mispredict condition. The mispredict PC storage includes a mispredict PC queue and a number of staging registers wherein the mispredict PC queue has at least as many stages as the number of staging registers.
摘要:
A system for, and method of, reference-modeling a processor design. In one embodiment, the system includes: (1) an architecture database that contains specifications regarding the processor design that include: instruction set specifications, architectural resource specifications, pipeline specifications and connectivity specifications, (2) a simulation subsystem that draws selected portions of the specifications to simulate and test the processor design and (3) a documentation subsystem that draws other selected portions of the specifications to document and register-model the processor design, changes in the specifications being propagated to the architecture database.
摘要:
An apparatus includes a dielectric slab having first and opposing second major surfaces. A planar antenna element is located on the first major surface. A via formed through the dielectric slab is conductively connected to the antenna element. A plurality of solder bump pads is located on the second major surface and is configured to attach the dielectric slab to an integrated circuit.
摘要:
Policy-based management method for remote management of a home device (3), said method comprising: a triggering step wherein the operational state of the home device (3) changes under occurrence of a triggering event belonging to one of the following event categories: a device event, where the event is automatically produced by the home device (3); a scheduled event, where the event is automatically produced by a clock; a user event, where the event is produced by a user; an evaluation step, wherein a home device management (HDM) server (9) evaluates at least one device selection criterion; a policy run cycle, wherein the HDM server (9) runs a policy on the home device (3), said policy being selected among the following policies: an activation policy if the triggering event is of the device type; a management policy if the triggering event is of the scheduled type; a transient policy if the triggering event is of the user type.
摘要:
An apparatus, e.g. an optical receiver, includes an optical front end and an equalizer. The front end is configured for receiving an optical signal bearing first and second symbols on respective first and second polarization channels. The equalizer is configured to 1) select a first cost function if the first symbol has greater energy than the second symbol, 2) select a second different cost function if the second symbol has a greater energy than the first symbol, and 3) based on the selected cost function, update coefficients of an adaptive filter configured to demultiplex and equalize the first and second polarization channels.
摘要:
A cache management system and method and a content distribution system. In one embodiment, the cache management system includes: (1) a content request receiver configured to receive content requests, (2) a popularity lifetime prediction modeler coupled to the content request receiver and configured to generate popularity lifetime prediction models for content that can be cached based on at least some of the content requests, (3) a database coupled to the popularity lifetime prediction modeler and configured to contain the popularity lifetime prediction models and (4) a popularity lifetime prediction model matcher coupled to the content request receiver and the database and configured to match at least one content request to the popularity lifetime prediction models and control a cache based thereon.
摘要:
An apparatus comprising an optical modulator, wherein the optical modulator comprises a planar substrate, a first III-V semiconductor layer on the substrate, and a silicon layer on the substrate. The optical modulator includes a planar semiconductor optical waveguide having a hybrid optical core, the hybrid optical core including vertically adjacent lateral portions of the first III-V semiconductor layer and the silicon layer.