Altera Corporation

Benjamin Thomas Cope

Lei Xu

Kulwinder Singh Dhanoa

Michael Philip Fitton

Kellie Marks

Martin Langhammer

Volker Mauer

Nima Safari

Shahin Gheitanchi

Sharifuddin Sapuan Sahori

Integrated circuits with wireless communications circuitry having peak cancelation circuitry operable to perform crest factor reduction is provided. The peak cancelation circuitry may receive at least first and second carrier waveforms and may include at least a first canceling pulse generator (CPG), a second CPG, a first peak detector for performing peak detection on the first waveform, a second peak detector for performing peak detection on the second waveform, a third peak detector for performing peak detection on a combined waveform of the first and second waveforms, and a pulse allocator that receives clipping information from the three peak detectors and that controls the amount of peak cancelation that is being performed by the two CPGs. The allocator may determine whether the combined waveform contains any peaks. In response to determining that the combined waveform does not contain any peaks, the CPGs may be configured in bypass mode.

Multi-standard peak canceling circuitry

Various structures and methods are disclosed related to efficiently accessing a memory for a particular application. An embodiment of the present invention utilizes characteristics of an access pattern for a particular application to provide a more efficient organization of data in a memory. In one embodiment, the predictability in access needs for a particular application is exploited to provide a data organization method for organizing data in an SDRAM memory to support efficient access. In one embodiment, the particular application is operation under the Long Term Evolution ('LTE') standard for wireless communications. In one embodiment, associated hardware and methods are provided to, when necessary, reorder read commands and, when necessary, reorder data read from memory so that at least some of the time overhead for accessing one row can be hid behind an access of another row.

SDRAM memory organization and efficient access

A method includes identifying a signal peak from an input signal. The signal peak may be detected with peak detection circuitry. A serial division operation may be performed on the identified signal peak value with serial division circuitry to obtain a scaling factor. The peak detection circuitry may identify an additional signal peak from the input signal concurrently with the serial division operation. The serial division operation may be halted if the additional identified signal peak is greater than the previous identified signal peak. Another serial division operation may be performed based on the additional identified signal peak.

Circuitry and techniques for calculating scaling factors for crest factor reduction

Systems and methods are disclosed for interfacing between hard logic elements and soft logic elements implemented on an integrated device. In particular, a configurable interface is provided that includes interconnects between hard logic and soft logic, which enable signals to be selectively routed between the inputs and outputs of hard logic blocks and soft logic modules. The interconnects allow for certain hard logic blocks to be bypassed in favor of soft logic functionality. Moreover, the interconnects allow soft logic to augment the processing of hard logic blocks, e.g., by providing additional signals to the hard logic block.

Systems and methods for interfacing between hard logic and soft logic in a hybrid integrated device

Integrated circuits with wireless communications circuitry having peak cancelling circuitry operable to perform crest factor reduction is provided. The peak cancelling circuitry may include a peak detection circuit, a delay circuit, and peak cancellation pulse generation circuitry. The peak cancellation pulse generation circuitry may include multiple pulse generation blocks coupled in a cascade configuration. Each pulse generation block may include a counter for providing memory address signals, a register for latching peak scaling factor information, a pulse memory block for storing a respective sub-pulse, and a multiplier for scaling the stored sub-pulse by the latched peak scaling factor. The pulse memory block may be implemented using single-port memory or dual-port memory. In other suitable arrangements, the peak cancellation pulse generation circuitry may include an allocator circuit and a crossbar switch for selectively coupling the counters and registers to respective pulse memory blocks and multipliers.

Circuitry for generating peak cancelling pulses

Systems and methods are disclosed for calculating Fast Fourier Transforms (FFT) in a power and memory bandwidth efficient manner. For example, an apparatus is provided that includes a memory interface operable to read data samples stored in a memory and store a first set of the data samples in a read reorder buffer, wherein the read reorder buffer selects a first portion of the first set of the data samples in accordance with a radix-reversed order. Also included is a first core circuit that is operable to process the first portion of the first set of the data samples in response to receiving the first portion from the read reorder buffer, wherein the processing includes calculating output samples corresponding to a part of an FFT.

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London, United Kingdom

Benjamin Thomas Cope