蓝牙低功耗BLE4.1 标准，用于开发实现蓝牙低功耗4.1协议栈-Bluetooth low energy BLE4.1 standard for the development to achieve low-power Bluetooth 4.1 protocol stack

数字基带接收子系统包含下变频、低通滤波、微分解调、包检测、帧同步和帧解析六个模块。(The reception subsystem included down-conversion, low-pass filtering, differential demodulation, packet detection, frame synchronization and frame analysis.)