根据美国调节机构的预先规定，２．４GHz频段有两种不同的扩频方法：直接序列和跳频。蓝牙技术采用的是跳频方法。蓝牙是短距离无线数据传输的世界标准。它将使手机、PDA、膝上型电脑等移动通信设备的电缆连接成为多余的。它的主要标志是结构简单，耗电少，复杂性低，致使成本 According to the pre-regulation of the U.S. regulatory agency, there are two different spread spectrum methods in the 2.4GHz band: direct sequence and frequency hopping. Bluetooth technology uses a frequency hopping method. Bluetooth is the world standard for short-range wireless data transmission. It will make the cables of mobile communication devices such as cell phones, PDAs, laptops and the like redundant. Its main symbol is the simple structure, low power consumption, low complexity, resulting in cost