| 摘要 |
This application discloses a method for sending and receiving a signal, and a corresponding device and system. The method includes: performing constellation mapping on a data stream to obtain a mapped signal; performing pre-filtering on the mapped signal to convert the mapped signal into a narrowband signal filtered signal, where the pre-filtering is finite impulse response filtering, bandwidth of the narrowband signal filtered signal is less than bandwidth of the mapped signal, and the narrowband signal filtered signal is a baud rate signal; performing waveform forming according to the narrowband signal filtered signal to obtain a shaped signal; and performing digital-to-analog conversion on the shaped signal to convert a shaped second signal into an analog signal, and sending the analog signal. The transmitter in the foregoing solutions converts a broadband mapped signal into a narrowband filtered signal by using a filter, so that the filtered signal can smoothly pass through a digital-to-analog converter whose bandwidth is also narrow, thereby reducing signal damages caused due to insufficient bandwidth of a device. |
