Signal modulation method and device
The present invention provides a signal modulation method. The method includes: generating a transmit signal pulse waveform, where a width of the pulse waveform is τ, each pulse waveform is associated with n symbols (n>1), a width of each symbol is Δτ, and Δτ = τ n ; performing an operation on every n consecutive symbols in a to-be-sent symbol flow and the pulse waveform according to a preset operation manner, to generate an associated signal of the symbols and the pulse waveform; and sending the associated signal by using a transmission channel. The present invention helps improve spectral efficiency of a system. In addition, symbols are mutually constrained based on a correlation between the symbols, and information symbols are scattered to a plurality of symbols, thereby helping improve a capability of resisting noise and attenuation by a signal.
1. A signal modulation method, wherein the method comprises:
generating a transmit signal pulse waveform, wherein a width of the pulse waveform is τ, each pulse waveform is associated with n symbols, n>1, a width of each symbol is Δτ, and
Δτ
=
τ
n
;
and
performing an operation on every n consecutive symbols in a to-be-sent symbol flow and the pulse waveform according to a preset operation manner, to generate an associated signal of the symbols and the pulse waveform;
wherein the preset operation manner is a convolution operation, and the step of performing an operation on every n consecutive symbols in a to-be-sent symbol flow and the pulse waveform according to a preset operation manner, to generate an associated signal of the symbols and the pulse waveform comprises:
obtaining, based on a convolution expression S i ×h 0 +S i−1 ×h 1 . . . +S i−n+1 ×h n−1 , the associated signal generated by using the every n consecutive symbols in the to-be-sent symbol flow and the pulse waveform, wherein S i indicates an i th symbol, i is an integer, h is a pulse waveform function, and h=[h 0 , h 1 , . . . , h n−1 ].
2. The method according to claim 1 , wherein the preset operation manner is a multiplication operation, and the step of performing an operation on every n consecutive symbols in a to-be-sent symbol flow and the pulse waveform according to a preset operation manner, to generate an associated signal of the symbols and the pulse waveform comprises:
obtaining, based on a multiplication expression S i h 0 ×S i−1 h 1 . . . ×S i−n+1 h n−1 , the associated signal generated by using the every n consecutive symbols in the to-be-sent symbol flow and the pulse waveform, wherein S i indicates an i th symbol, i is an integer, h is a pulse waveform function, h=[h 0 , h 1 , . . . , h n−1 ], and n indicates a quantity of associated symbols.
3. The method according to claim 2 , wherein the symbol S i is expressed as Ae j(wt+θ i ) , wherein A indicates an amplitude, w indicates an angular frequency, t indicates a time, and θ i indicates a phase; and the associated signal generated by using the every n consecutive symbols in the symbol flow and the pulse waveform is A′e j((h 0 +h 1 + . . . +h n−1 )wt+h 0 θ i +h 1 θ i−1 + . . . h n−1 θ i−n+1 ) , wherein A′ indicates an amplitude of the associated signal.
4. The method according to claim 1 , wherein the preset operation manner comprises an addition operation, a subtraction operation, a multiplication operation, or an operation of a preset function relationship.
5. A signal modulation device, wherein the device comprises:
a pulse waveform generation unit, configured to generate a transmit signal pulse waveform, wherein a width of the pulse waveform is τ, each pulse waveform is associated with n symbols, n>1, a width of each symbol is Δτ, and
Δτ
=
τ
n
;
and
an operation unit, configured to perform an operation on every n consecutive symbols in a to-be-sent symbol flow and the pulse waveform according to a preset operation manner, to generate an associated signal of the symbols and the pulse waveform;
wherein the preset operation manner is a convolution operation, and the operation unit is configured to:
obtain, based on a convolution expression S i ×h 0 +S i−1 ×h 1 . . . +S i−n+1 ×h n−1 , the associated signal generated by using the every n consecutive symbols in the to-be-sent symbol flow and the pulse waveform, wherein S i indicates an i th symbol, i is an integer, h is a pulse waveform function, and h=[h 0 , h 1 , . . . , h n−1 ].
6. The device according to claim 5 , wherein the preset operation manner is a multiplication operation, and the operation unit is specifically configured to:
obtain, based on a multiplication expression S i h 0 ×S i−1 h 1 . . . ×S i−n+1 h n−1 , the associated signal generated by using the every n consecutive symbols in the to-be-sent symbol flow and the pulse waveform, wherein S i indicates an i th symbol, i is an integer, h is a pulse waveform function, and h=[h 0 , h 1 , . . . , h n−1 ].
7. The device according to claim 6 , wherein the symbol S i is expressed as Ae j(wt+θ i ) , wherein A indicates an amplitude, w indicates an angular frequency, t indicates a time, and θ i indicates a phase; and the associated signal generated by using the every n consecutive symbols in the symbol flow and the pulse waveform is A′e j((h 0 +h 1 + . . . +h n−1 )wt+h 0 θ i +h 1 θ i−1 + . . . h n−1 θ i−n+1 ) , wherein A′ indicates an amplitude of the associated signal.
8. The device according to claim 5 , wherein the preset operation manner comprises an addition operation, a subtraction operation, a multiplication operation, or an operation of a preset function relationship.