Abstract: Various apparatuses, methods and systems for frequency dividing a clock signal are disclosed herein. For example, some embodiments of the present invention provide an apparatus including a plurality of multiplexers connected in series with the clock signal, each having a plurality of inputs of different phase delays. The apparatus also includes a delta sigma modulator connected to control inputs on the plurality of multiplexers. The delta sigma modulator is adapted to repeatedly select different ones of the pluralities of inputs of different phase delays in the plurality of multiplexers to change a divide ratio between the clock signal and an output of the plurality of multiplexers. The apparatus also includes a multiplexer usage accumulator connected to the delta sigma modulator to track usage of the plurality of multiplexers.

Abstract: A wireless receiver (74) for receiving signals from a transmitter (72). The transmitter comprises a plurality of transmit antennas (TAT1?, TAT2?) for transmitting the signals, which comprise respective independent streams of symbols. Additionally, interference occurs between the respective streams. The receiver comprises a plurality of receive antennas (RAT1?, RAT2?) for receiving the signals as influenced by a channel effect between the receiver and the transmitter. The receiver also comprises circuitry (80) for multiplying the signals times a conjugate transpose of an estimate of the channel effect and times a conjugate transpose of a linear basis transformation matrix. The receiver also comprises circuitry (84) for selecting the linear basis transformation matrix from a finite set of linear basis transformation matrices. Lastly, the receiver comprises circuitry (88) for removing the interference between the respective streams.

Abstract: A method of wireless handover in a broadcast network (FIGS. 5 and 8) is disclosed. A wireless receiver (FIG. 4) receives a first signal (N) from a first transmitter (f1). The receiver measures a signal strength (RSSI) of the first signal. The strength of the first signal is compared to a first threshold (T0). The receiver receives a second signal (N+3) from a second transmitter (f3) in response to the step of comparing. The first and the second signals are sent to an application processor (120). The wireless receiver continues to receive the first and second signals until the application processor terminates receiving one of the first and second signals.

Abstract: A system and method for low-cost performance and compliance testing of local oscillators and transmitters for wireless RF applications. A preferred embodiment comprises observing a digital signal from within an RF circuit, manipulating the signal with digital signal processing techniques, and determining if the RF circuit passes a test based upon results from the manipulating. Since the signal is clocked at a much lower frequency than an RF output of the RF circuit and the manipulation is performed digitally, testing can be performed at different stages of the production cycle and expensive test equipment can be eliminated.

Abstract: Methods, digital systems, and computer readable media are provided for estimating change of amplitude and frequency in a digital audio signal by transforming a frame of the digital audio signal to the frequency domain, locating a frequency peak in the transformed frame, determining an interpolated peak of the located frequency peak, computing inner products of a portion of the transformed frame about the interpolated peak with a plurality of test signals, and estimating change of amplitude and change of frequency for the frequency peak from results of the inner products.

Abstract: A low-noise amplifier (LNA) includes a pair of transistors connected in a cascode configuration to provide amplification to an input signal. The LNA generates an amplified output in differential form across a pair of output terminals. One of the pair of output terminals is the output node of the cascode configuration. The LNA further includes a feedback transistor with its gate terminal connected to the output node of the cascode configuration and its drain terminal connected to the other one of the pair of output terminals. The differential nature of the amplified output reduces the noise figure of the LNA. A frequency-selective network connected across the pair of output terminals sets the frequency selectivity of each of the input section and the output section of the LNA.

Abstract: Embodiments of the present disclosure provide a power controller, a method of operating a power controller and a semiconductor memory system. In one embodiment, the power controller is for use with a memory and includes an access module configured to provide an active state of the memory to allow memory access. The power controller also includes a retain-till-access module configured to cycle a portion of the memory between the active state and a low leakage data retention state of the memory. The power controller further includes an expanded retain-till-access module configured to extend the active state of the memory for a specified period of time before returning the memory to the low leakage data retention state.

Abstract: Embodiments of the present disclosure provide a transmitter, a receiver and methods of operating a transmitter and a receiver. In one embodiment, the transmitter is for use with NT transmit antennas and includes a precoder unit configured to precode data for transmission using a preceding matrix selected from a nested codebook, wherein the nested codebook provides codebooks corresponding to different transmission layers that are derived from column subsets of multiple NT×NT preceding matrices. The transmitter also includes a transmit unit configured to transmit the precoded data. In another embodiment, the receiver includes a receive unit configured to receive preceded data. The receiver also includes a precoder selection unit configured to select a preceding matrix from a nested codebook for the preceded data, wherein the nested codebook provides codebooks corresponding to different transmission layers that are derived from column subsets of multiple NT×NT preceding matrices.

Abstract: Apparatus and method for accessing a wireless telecommunications network by transmitting a random access signal. The random access signal includes a cyclic prefix signal and a guard interval. The cyclic prefix signal and the guard interval are adapted to optimize random access channel coverage in a telecommunications cell. The disclosed method for transmitting a random access signal includes transmitting a cyclic prefix signal. The duration of the cyclic prefix signal is approximately the sum of a maximum round trip delay duration of the telecommunications cell and a maximum delay spread duration. The method further includes providing a guard interval. The guard interval duration being approximately the duration of the maximum round trip delay of the telecommunications cell.

Abstract: Tamper-resistant circuitry for use with an electronic device is provided, where the electronic device comprises a plurality of connections for coupling the tamper-resistant circuitry to functional circuitry for performing functionality in connection with the electronic device. The tamper-resistant circuitry comprises an interface for coupling to the plurality of connections and a power source for coupling to at least one connection in the plurality of connections. The tamper-resistant circuitry further comprises circuitry operable to evaluate a measure of an operational parameter related to the power source and in response to a signal at at least one connection in the plurality of connections, to provide an acceptable range for the operational parameter, and to inhibit standard operation of the functional circuitry in response to detecting an anomaly in the functional circuitry by detecting that the measure is outside the acceptable range.

Abstract: A frequency divider includes a least significant (LS) stage, multiple cascaded divider stages, and an output stage. The LS stage receives an input signal, a program bit and a first mode signal, and generates a first frequency-divided signal and an output mode signal. Each of the plurality of divider stages divides the frequency of an output of an immediately previous stage by a value specified by a corresponding program bit and a corresponding mode signal. A first divider stage in the plurality of divider stages is coupled to receive the first frequency-divided signal and to generate the first mode signal. The output stage receives the output mode signal and a control signal, and generates an output signal by dividing a frequency of the output mode signal by two if the control signal is at one logic level. The output stage forwards the output mode signal without division otherwise.

Abstract: Methods and systems are provided for geometry-based virtual memory management. The methods and systems use Boolean space algebra operations to manage allocation and deallocation of tiled virtual memory pages in a tiled virtual memory provided by a tiled virtual memory subsystem. A region quadtree may be maintained representing a current allocation state of tiled virtual memory pages within a container. The region quadtree may be used to locate a rectangle or two dimensional (2D) array of unallocated tiled virtual memory pages, and physical memory pages may be mapped to tiled virtual memory pages in the rectangle by updating a lookup table used to translate tiled virtual memory page addresses to physical memory page addresses. A union or intersection of region quadtrees may be performed to generate a new region quadtree representing a new current allocation state of the tiled virtual memory pages.

Abstract: A data encoding algorithm can be used (120) to generate overhead bits from original data bits, and the original data bits and overhead bits can be transmitted in respectively separate transmissions (121, 123), if the overhead bits are needed. At the receiver, the original data bits can be determined (125) from the received overhead bits, or the received data bits and the received overhead bits can be combined and decoded together (126) to produce the original data bits.

Abstract: User equipment (UE)-initiated accesses within a cellular network include non-synchronized random access requests when the UE is not synchronized with a base station that is serving a cell occupied by the UE. The random access request is formed by generating a set of samples at a selected sample rate, such that the set of samples spans a specified duration period, wherein the sample rate is one of a plurality of different sample rates enabling different implementations of the random access transmission. The specified duration period is integrally divisible by each of the plurality of different sample periods.

Abstract: A novel and useful adaptive frequency hopping scheme for wireless devices and networks operating in a congested environment of similar devices, where capacity maximization is desired. The hopping sequence of each wireless link is dynamically adapted such that the impact of the surrounding interference is minimized and the interference induced onto the coexisting systems is also minimized. The scheme detects the repetitive presence of interference on a particular channel and comprises a replacement mechanism for swapping the interfered frequency-channel with one that would be clear for that particular time-slot. The mechanism detects interference during a redundant portion of the transmission (i.e. header or trailer) without having to experience packet failures (i.e. data loss). If the interference impact (e.g.

Abstract: A cell within cellular network includes user equipments (UEs) that transmit data to a base station (eNB). UEs are synchronized to the eNB upon entry to the cell. If a particular UE has data to transmit, it will be placed in a connected state and scheduled for transmission. Over a period of time, not all of the UEs will have data to transmit. The UEs are tracked as a scheduled portion and an unscheduled portion, wherein a UE is included in the scheduled portion in response to receiving a scheduling request from the UE.

Abstract: Transmission with multiple antennas in a wireless network is performed by transmitting a plurality of reference sequences (RS) from a UE. A first RS s1[k] is produced using a first cyclic shift and a base sequence s0[k], wherein k={1, 2 . . . K} is an element index. A second RS s2[k] is produced using a second cyclic shift and s0[k]. A first symbol sequence x1[k] is produced using at least s1[k] and s2[k], for at least one k. A second symbol sequence x2[k] is produced using at least s1[k] and s2[k], for at least one k. x1[k] is transmitted using a first transmit antenna and x2[k] is transmitted using a second transmit antenna.

Abstract: A system and method of identifying and preventing security violations within a computing system. Some exemplary embodiments may be a method comprising monitoring activity on a core bus coupled to a processor core (the processor core operating in a computing system), identifying activity on the core bus as a security violation, and preventing execution of an instruction within the processor core in response to the security violation.

Abstract: A system is provided that includes a processor and a system memory coupled to the processor, the system memory stores at least one application for execution by the processor. The system also includes logic coupled to the processor, the logic providing a secure time reference. The processor selectively accesses the secure time reference to generate a virtual time reference for the at least one application.

Abstract: Embodiments of the invention provide methods for optimizing the spectral efficiency of control channel transmissions carrying scheduling assignments from a serving Node B to user equipments. This is accomplished by adjusting the control channel size between successive transmission time intervals according to the number of user equipments having scheduling assignments and possibly according to the modulation and coding scheme used for the transmission of each scheduling assignments.