Abstract
This paper describes the design of FPGA based signal processing card. An on board real time digital signal processing system is designed using FPGA. The platform can decode process of various kinds of digital and analog signals simultaneously. The design trend in this card is towards small size, high integration and fast real time processing. For the optimum performance a 16 bit 1 MSPS ADC is used which is interfaced with FPGA to make all the data processing onboard in real time. This card can be used in many signal processing based applications like audio signal processing, audio compression, digital image processing, video compression, speech processing, speech recognition, digital communications by interfacing several separate board using inbuilt I/O’s, each with a number of input channels that will communicate with each other in real time over a high speed communication link. The resulting images can be displayed directly on LCD or OLED panel displays using I/O’s peripherals. The project introduces many challenging issues, which are being addressed in turn with different prototype designs. These issues are the ADC performance, interfacing the ADCs to the FPGA, implementing the flexible processing algorithms and high speed interconnection between the boards.
Highlights
Digital hardware is generally superior and more reliable than its analogue counterpart which can be prone to ageing and can give uncertain performance in production[21]
Microprocessors, DSP micros and FPGAs perform a suitable platform for processing such digital signals, More recently,the field-programmable gate array (FPGA) has been proposed as a hardware technology for DSP systems in many new designs and applications for a variety of reasons but primarily because of their extreme-high performance and flexibility[23]
This card is on board user programmble xilinx virtex-4SX FPGA for signal processing funtion such as channelization,modulation, and error correction, with the data rates of 600 Mb/s HSTL & SSTL and 1 Gb/s LVDS.The card has a large number of high speed input output GPIOs,DDS interface and OLED interface that are connected to FPGA through buffer.Data from analog-to-digital converter (ADC) is received by dedicated DDS register, which enables high performance data receptions
Summary
Digital hardware is generally superior and more reliable than its analogue counterpart which can be prone to ageing and can give uncertain performance in production[21]. Microprocessors, DSP micros and FPGAs perform a suitable platform for processing such digital signals, More recently,the field-programmable gate array (FPGA) has been proposed as a hardware technology for DSP systems in many new designs and applications for a variety of reasons but primarily because of their extreme-high performance and flexibility[23] This is true that FPGAs have integrated gigabit serial communications, memory interfaces, immersed processors, and a wide range of available core firmware modules .This card is tested for laser beam communication which requires very fast data processing it can be used for a vast range of signal processing’s simultaneously. Energy in a reasonable size battery, minimum power dissipation in the mixed-signal integrated circuits is necessary [17].The analog-to-digital converter (ADC) is the key component because it bridges the gap between the analog physical world and digital logic world[1][2]
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