The best solution for software radio processing based on CPCI architecture

Software radio is a revolutionary approach to radio design that relies on a flexible, modular hardware platform combined with software-driven functionality. Unlike traditional radios that are built around fixed, purpose-specific hardware, software radio allows for the implementation of various radio functions through software programming. This shift reduces the reliance on single-function analog circuits and brings digitization as close to the antenna as possible. The architecture emphasizes openness and full programmability, enabling system reconfiguration and new feature integration via software updates. A standard, high-performance open bus architecture supports continuous hardware upgrades and expansion. A typical software radio system includes an antenna, a broadband RF converter, ADCs (Analog-to-Digital Converters), DACs (Digital-to-Analog Converters), and a Digital Signal Processor (DSP). The key component is the DSP, which replaces dedicated digital circuits and allows for greater flexibility in both hardware and function. The DSP handles tasks such as intermediate frequency processing, baseband signal manipulation, and bit stream analysis. The hardware platform is modular and open, allowing different functions to be implemented by loading specific software or replacing modules when necessary. However, this flexibility comes at a cost: software radio requires high-performance components like broadband RF front-ends, high-speed ADCs and DACs, and powerful DSPs capable of operating at frequencies up to hundreds of megahertz. To handle complex signal processing, multiple CPUs often operate in parallel, and the system bus must support high I/O transfer rates to meet performance demands. Beijing Taispeed Technology Co., Ltd. has developed a cutting-edge software radio platform based on CPCI architecture, compliant with PICMG2.0 D3.0 standards. It features dual TI TMS320C6455 DSPs and a Xilinx FPGA model XC5VSX95T-1FF1136C, making it an ideal solution for advanced software radio applications. The system architecture is designed for maximum flexibility and performance. As shown in the diagram below:

In terms of technical specifications, the processing board includes: 1. Two AD input channels using the ADS62P49 device, supporting a maximum sampling rate of 250MSPS with 14-bit resolution. The input signal amplitude is 1V at 50 ohms, with SMA connectors. 2. Two DAC output channels using the AD9777 device, offering a conversion rate of 160MHz with 14-bit data. The output signal is also 1V at 50 ohms, with SMA interfaces. The DSP section features: 1. A clock speed of 1GHz, with support for up to 1.2GHz. 2. An independent memory bus with onboard DDR2-500 (512MB). 3. PCI interface supporting Master/Slave modes at 32bit/33MHz or 32bit/66MHz. 4. Dual DSPs connected via EMIF and McBSP, with EMIF supporting 16-bit, 32-bit, and 64-bit widths at 100MHz. 5. Support for 32MB–128MB NOR Flash. 6. A Gigabit network interface. 7. RapidIO interconnect between the two C6455s, providing up to 10 Gbps bidirectional throughput. The FPGA section uses the Xilinx XC5VSX95T-1FF1136C, featuring 160x54 logic cells, 120Kb of RAM, 640 DSP48E slices, 16 RocketIO GTPs, 20 IObanks, and up to 680 IOs. Additional features include: 1. Support for external DDR2 memory up to 2GB. 2. External reference clock input via SMA. 3. External event trigger input via SMA. 4. Dial code input and LED status indication.

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