Patent application number | Description | Published |
20130111159 | Digital Signal Processing Data Transfer | 05-02-2013 |
20130329838 | EFFICIENT DEMAPPING OF CONSTELLATIONS - Methods and apparatus for efficient demapping of constellations are described. In an embodiment, these methods may be implemented within a digital communications receiver, such as a Digital Terrestrial Television receiver. The method reduces the number of distance metric calculations which are required to calculate soft information in the demapper by locating the closest constellation point to the received symbol. This closest constellation point is identified based on a comparison of distance metrics which are calculated parallel to either the I- or Q-axis. The number of distance metric calculations may be reduced still further by identifying a local minimum constellation point for each bit in the received symbol and these constellation points are identified using a similar method to the closest constellation point. Where the system uses rotated constellations, the received symbol may be unrotated before any constellation points are identified. | 12-12-2013 |
20140068168 | TILE BASED INTERLEAVING AND DE-INTERLEAVING FOR DIGITAL SIGNAL PROCESSING - Tile based interleaving and de-interleaving of row-column interleaved data is described. In one example, the de-interleaving is divided into two memory transfer stages, the first from an on-chip memory to a DRAM and the second from the DRAM to an on-chip memory. Each stage operates on part of a row-column interleaved block of data and re-orders the data items, such that the output of the second stage comprises de-interleaved data. In the first stage, data items are read from the on-chip memory according to a non-linear sequence of memory read addresses and written to the DRAM. In the second stage, data items are read from the DRAM according to bursts of linear address sequences which make efficient use of the DRAM interface and written back to on-chip memory according to a non-linear sequence of memory write addresses. | 03-06-2014 |
20140068170 | MEMORY ADDRESS GENERATION FOR DIGITAL SIGNAL PROCESSING - Memory address generation for digital signal processing is described. In one example, a digital signal processing system-on-chip utilises an on-chip memory space that is shared between functional blocks of the system. An on-chip DMA controller comprises an address generator that can generate sequences of read and write memory addresses for data items being transferred between the on-chip memory and a paged memory device, or internally within the system. The address generator is configurable and can generate non-linear sequences for the read and/or write addresses. This enables aspects of interleaving/deinterleaving operations to be performed as part of a data transfer between internal or paged memory. As a result, a dedicated memory for interleaving operations is not required. In further examples, the address generator can be configured to generate read and/or write addresses that take into account limitations of particular memory devices when performing interleaving, such as DRAM. | 03-06-2014 |
20150155973 | Efficient Demapping of Constellations - Methods and apparatus for efficient demapping of constellations are described. In an embodiment, these methods may be implemented within a digital communications receiver, such as a Digital Terrestrial Television receiver. The method reduces the number of distance metric calculations which are required to calculate soft information in the demapper by locating the closest constellation point to the received symbol. This closest constellation point is identified based on a comparison of distance metrics which are calculated parallel to either the I- or Q-axis. The number of distance metric calculations may be reduced still further by identifying a local minimum constellation point for each bit in the received symbol and these constellation points are identified using a similar method to the closest constellation point. Where the system uses rotated constellations, the received symbol may be unrotated before any constellation points are identified. | 06-04-2015 |
20150161058 | Digital Signal Processing Data Transfer - A technique for transferring data in a digital signal processing system is described. In one example, the digital signal processing system comprises a number of fixed function accelerators, each connected to a memory access controller and each configured to read data from a memory device, perform one or more operations on the data, and write data to the memory device. To avoid hardwiring the fixed function accelerators together, and to provide a configurable digital signal processing system, a multi-threaded processor controls the transfer of data between the fixed function accelerators and the memory. Each processor thread is allocated to a memory access channel, and the threads are configured to detect an occurrence of an event and, responsive to this, control the memory access controller to enable a selected fixed function accelerator to read data from or write data to the memory device via its memory access channel. | 06-11-2015 |
Patent application number | Description | Published |
20150015432 | SUB-CARRIER SUCCESSIVE APPROXIMATION MILLIMETER WAVE RADAR FOR HIGH-ACCURACY 3D IMAGING - A sub-carrier successive approximation (SCSA) radar having a sufficiently high accuracy to capture 3D images of concealed objects. The invention is phase-based, and directly measures round trip time by estimating the phase delay of the carrier. One of its advantages is that the carrier does not need to sweep across a wide frequency range, thereby relaxing RF front-end bandwidth and linearity requirements. SCSA radar accuracy is limited only by the extent of system noise, allowing very high accuracy to be achieved with a sufficient integration period. The SCSA radar can be readily implemented in CMOS, as well as other device technologies, and fabricated within one or more small integrated circuits. | 01-15-2015 |
20150280321 | LOW POWER MULTI-GIGABIT PER SECOND MILLIMETER-WAVE DATA-LINK EMPLOYING MODULATED REFLECTIONS - A system for wirelessly communicating between a base station and a mobile device, including a reflector integrated with a mobile device, wherein the reflector reflects carrier radiation transmitted from a base station, to form a reflection of the carrier radiation, and input data from the mobile device modulates a reflection coefficient of the reflector, thereby modulating the reflection such that the reflection of the carrier radiation carries the input data to the base station. | 10-01-2015 |
20150288048 | INKJET OR PEN BASED PRINTED PERIODIC DIRECTORS FOR MILLIMETER-WAVE LINKS ON FLEXIBLE SUBSTRATES - A data link, comprising a substrate; and an ink structure printed and/or marked on a substrate, wherein the structure directs an electric, magnetic, and/or electromagnetic wave between two locations. | 10-08-2015 |