Signal processing method and apparatus
Embodiments of this application provide a signal processing method and apparatus. A sending device sends a first symbol and modulates a phase of a second symbol based on a first phase, a second frequency, and a second duration. The second symbol is the next symbol after the first symbol. The first phase is a phase at the end of the first symbol. The second frequency is a transmission frequency used for the second symbol, and the second duration is a duration of a cyclic prefix of the second symbol. The sending device sends a modulated second symbol by using the second frequency, where phases between the modulated second symbol and the first symbol are continuous. This avoids a phase jump, and therefore reduces interference caused by a transmitted signal to a signal transmitted on an adjacent frequency band.
1 . A signal processing method, the method comprising:
sending a first symbol;
modulating a phase of a second symbol based on a first phase, a second frequency, and a second duration, wherein the second symbol is a next symbol after the first symbol, the first phase is a phase at the end of the first symbol, the second frequency is a transmission frequency utilized for the second symbol, and the second duration is a duration of a cyclic prefix of the second symbol; and
sending a modulated second symbol by utilizing the second frequency, wherein phases between the modulated second symbol and the first symbol are continuous.
2 . The method according to claim 1 , wherein the first phase is determined based on a second phase, a first frequency, and a first duration, the second phase is a phase of the first symbol, the first frequency is a transmission frequency utilized for the first symbol, and the first duration is a remaining duration of the first symbol without a cyclic prefix.
3 . The method according to claim 1 , wherein the first phase is same as a second phase, and the second phase is a phase of the first symbol.
4 . The method according to claim 1 , wherein the second frequency is determined based on data that is to be sent.
5 . The method according to claim 1 , wherein the first symbol and the second symbol are orthogonal frequency division multiplexing (OFDM) symbols.
6 . The method according to claim 1 , wherein a phase of the modulated second symbol is different from the phase of the second symbol.
7 . The method according to claim 6 , wherein a duration of the modulated second symbol is same as a duration of the second symbol.
8 . A signal processing method, the method comprising:
receiving a first symbol;
receiving a modulated second symbol, wherein the modulated second symbol is modulated based on a first phase, a second frequency, and a second duration, the first phase is a phase at the end of the first symbol, the second frequency is a transmission frequency utilized for the second symbol, the second duration is a duration of a cyclic prefix of the second symbol, phases between the modulated second symbol and the first symbol are continuous, and the modulated second symbol is a next symbol after the first symbol; and
demodulating the modulated second symbol based on the second frequency.
9 . The method according to claim 8 , wherein the first phase is determined based on a second phase, a first frequency, and first a duration, the second phase is a phase of the first symbol, the first frequency is a transmission frequency utilized for the first symbol, and the first duration is a remaining duration of the first symbol without a cyclic prefix.
10 . The method according to claim 8 , wherein the first phase is same as a second phase, and the second phase is a phase of the first symbol.
11 . The method according to claim 8 , wherein the second frequency is determined based on data that is to be sent.
12 . The method according to claim 8 , wherein the first symbol and the second symbol are orthogonal frequency division multiplexing (OFDM) symbols.
13 . The method according to claim 8 , wherein a phase of the modulated second symbol is different from the phase of the second symbol, and a duration of the modulated second symbol is same as a duration of the second symbol.
14 . A signal processing apparatus, comprising a processor, wherein the processor is configured to execute a computer program or instructions stored in non-transitory computer readable storage medium, to:
send a first symbol;
modulate a phase of a second symbol based on a first phase, a second frequency, and a second duration, wherein the second symbol is a next symbol after the first symbol, the first phase is a phase at the end of the first symbol, the second frequency is a transmission frequency utilized for the second symbol, and the second duration is a duration of a cyclic prefix of the second symbol; and
send a modulated second symbol by utilizing the second frequency, wherein phases between the modulated second symbol and the first symbol are continuous.
15 . The apparatus according to claim 14 , wherein the first phase is determined based on a second phase, a first frequency, and a first duration, the second phase is a phase of the first symbol, the first frequency is a transmission frequency utilized for the first symbol, and the first duration is a remaining duration of the first symbol without a cyclic prefix.
16 . The apparatus according to claim 14 , wherein the first phase is same as a second phase, and the second phase is a phase of the first symbol.
17 . The apparatus according to claim 14 , wherein the second frequency is determined based on data that is to be sent.
18 . The apparatus according to claim 14 , wherein the first symbol and the second symbol are orthogonal frequency division multiplexing (OFDM) symbols.
19 . The apparatus according to claim 14 , wherein a phase of the modulated second symbol is different from the phase of the second symbol.
20 . The apparatus according to claim 19 , wherein a duration of the modulated second symbol is same as a duration of the second symbol.