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Dedicated hardware accelerators enable energy-efficient implementations of radio and imaging basebands. Multistandard, multi-mode radio basebands require an on-the-fly reconfigurable fast Fourier transform (FFT) accelerator that implements many different FFT sizes. An instance of a runtime-reconfigurable 2n3m5k FFT accelerator was generated by a custom hardware generator to meet the requirements of...
This paper presents results on FPGA of a RISC-V based Application Specific Processor (ASP), used as the main classification unit for acoustic pattern recognition of firearms and chainsaws in environmentally protected areas. The classifier is based on the Hidden Markov Models (HMM) technique, giving a probabilistic estimation of the current state of an acoustic environment, thereby identifying particular...
RISC-V is an open-source instruction set-architecture, designed to support customized extensions and architectures. This paper presents an instruction-set extension to the RISC-V ISA, idealized for software-defined radio applications. The custom instructions perform complex-number arithmetic, tailored for complex or quadrature modulation and baseband processing, and can perform one complex multiply-accumulate...
This work demonstrates a RISC-V vector microprocessor implemented in 28 nm FDSOI with fully integrated simultaneous-switching switched-capacitor DC–DC (SC DC–DC) converters and adaptive clocking that generates four on-chip voltages between 0.45 and 1 V using only 1.0 V core and 1.8 V IO voltage inputs. The converters achieve high efficiency at the system level by switching simultaneously to avoid...
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