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发明公开
CN102104394A 一种低速率扩频通信发射基带系统 有权 转让

一种低速率扩频通信发射基带系统
摘要：
本发明涉及一种低速率扩频通信发射基带系统，所述的系统用现场可编程门阵列(FPGA)和直接数字频率合成器(DDS)实现参数可设置的低速率扩频发射基带系统，具体包含：FPGA芯片、DDS芯片及外围模块；FPGA芯片包含：时钟信号发生模块；RS-232串行通信模块；中心控制模块；组帧模块；信道编码模块；PN码发生器模块；数字成型滤波器模块；和DDS工作状态控制器。DDS芯片包含：相位累加器模块、波形ROM模块、D/A转换模块和低通滤波模块，用于数模转换和信号调制；FPGA芯片的输入输出端口与DDS芯片的输入端口相连，将待调制的数据输入和状态控制信号至DDS芯片，控制DDS芯片的工作模式。
摘要（英）：

The invention relates to a low-rate spread spectrum communication transmission base band system. The system is characterized by using an FPGA (field-programmable gate array) and a DDS (direct digital synthesizer) to realize the low-rate spread spectrum transmission base band system with settable parameters. The system specifically comprises an FPGA chip, a DDS chip and a peripheral module, wherein the FPGA chip comprises a clock signal generating module, an RS (recommended standard)-232 serial communication module, a central control module, a framing module, a channel coding module, a PN (pseudo noise) code generator module, a digital shaping filter module and a DDS working condition controller; the DDS chip comprises a phase accumulator module, a waveform ROM (read only memory) module, aD/A conversion module and a lowpass filtering module and is used for D/A conversion and signal modulation; the input/output port of the FPGA chip is connected with the input port of the DDS chip; andthe FPGA chip inputs the data to be modulated and the condition control signal to the DDS chip and controls the working mode of the DDS chip.

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