在matlab上面对4fsk调制解调进行仿真，中间使用升余弦滤波器作为发送和接收滤波器-In the face of 4fsk modem matlab simulation, the middle raised cosine filter used to send and receive filters as

Pulse shaping filters are used at the heart of many modern data transmission systems (e.g. mobile phones, HDTV) to keep a signal in an allotted bandwidth, maximize its data transmission rate and minimize transmission errors. Raised cosine filters for