Method for sending and receiving signal, and corresponding device and system

摘要

A method for sending and receiving a signal is disclosed, and a corresponding device and system. The method includes performing constellation mapping on a data stream to obtain a mapped signal, and performing pre-filtering on the mapped signal to convert the mapped signal into a narrowband signal filtered signal. The pre-filtering is finite impulse response filtering. A 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. The method also includes 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.

主权项

1. A signal transmission method, comprising:
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 first filtered signal, wherein the pre-filtering is finite impulse response filtering, a bandwidth of the first filtered signal is less than a bandwidth of the mapped signal, and the first filtered signal is a baud rate signal; performing waveform forming according to the first filtered signal to obtain a shaped signal; performing digital-to-analog conversion on the shaped signal to obtain an analog signal; and sending the analog signal using a transmitter: wherein a relation for implementing the pre-filtering is D(k)=W0C(k)+W1C(k−1)+ . . . +WN-1C(k−N+1), wherein k is a time sequence number, D(k) is the first filtered signal, C(k) is the mapped signal, 0≦i≦N−1, N−1 is a maximum delay amount based on a time unit, Wi is an ith filter coefficient, and C(k−i) is a signal obtained by delaying C(k) by i time units.