Digital filter implementation over FPGA platform with LINUX OS

Projeto em FPGA de um Filtro Digital FIR do Tipo Sinc-Janelado Utilizado na Tecnologia F-OFDM

“…A implementação prática de técnicas de processamento digital de sinais em FPGA é de interesse em diversas aplicações, por exemplo, processamento de sinais e imageamento de ultrassom, com viabilidade demonstrada em [1], [2], filtragem digital para imagens em um processador embarcado implementado em uma distribuição Linux projetada para executar em FPGA [3], assim como o desenvolvimento de um modem OFDM (Orthogonal Frequency-Division Multiplexing) completo em um FPGA com a linguagem VHDL [4]- [6]. Além da tecnologia OFDM, existem estudos de implementação em FPGA de outras formas de onda, como UFMC (Universal Filtered Multi-Carrier) [7] e FDM não ortogonal [8].…”

Implementation of Embedded Linux Systems on FPGA Based Circuits for Real Time Process Control

“…To achieve the highest transfer rates between the control circuit and the operating system it is a good practice to integrate the processor running the operating system in the same chip with the control circuit. The most common method is to use embedded soft-core [4] MicroBlaze processors [1][2] [3] on which the operating system runs. This approach uses valuable FPGA resources and can only operate at a maximum clock frequency of 100 MHz.…”

“…The paper also focuses on the data exchange module between the processor and the control unit. Other implementations studied by us use modules that are provided by the development environment [2] or commercially provided modules [3],these modules can be implemented easily but are not as customizable and fast as the circuits recommended by us. These problems were approached from a hardware and a software point of view presented in the following sections.…”