Signal modulation device and terminal
A signal modulation device includes: a conversion module, configured to convert a baseband coded signal and output an in-phase signal sequence and a quadrature signal sequence; a coding expansion module, connected to the conversion module and configured to expand the in-phase signal sequence and the quadrature signal sequence respectively and output an in-phase signal coded sequence and a quadrature signal coded sequence; and a modulation module, connected to the coding expansion module and configured to modulate the in-phase signal coded sequence and the quadrature signal coded sequence and output a radio frequency signal.
1. A signal modulation device, comprising:
a conversion module, configured to convert a baseband coded signal and output an in-phase signal sequence and a quadrature signal sequence;
a coding expansion module, connected to the conversion module and configured to expand the in-phase signal sequence and the quadrature signal sequence respectively and output an in-phase signal coded sequence and a quadrature signal coded sequence; and
a modulation module, connected to the coding expansion module and configured to modulate the in-phase signal coded sequence and the quadrature signal coded sequence and output a radio frequency signal;
wherein the coding expansion module comprises: a first coding expansion submodule and a second coding expansion submodule which are connected to the conversion module respectively; wherein
the first coding expansion submodule expands the in-phase signal sequence and output the in-phase signal coded sequence; and
the second coding expansion submodule expands the quadrature signal sequence and output the quadrature signal coded sequence;
wherein the first coding expansion submodule expands each N-bits coded signal in the in-phase signal sequence and output a plurality of in-phase signal coded sequences; and
the second coding expansion submodule expands each N-bits coded signal in the quadrature signal sequence and outputs a plurality of quadrature signal coded sequences, N being a positive integer;
wherein the value of N is determined by following formula:
N
=
log
2
L
2
;
wherein
L represents the number of sample points corresponding to a modulation mode, and the modulation mode is a modulation mode adopted by the coding expansion module.
2. The signal modulation device according to claim 1 , wherein the first coding expansion submodule expands each N-bits coded signal in the in-phase signal sequence to M bits to obtain a plurality of in-phase signal coded sequences with a length of M bits; and
the second coding expansion submodule expands each N-bits coded signal in the quadrature signal sequence to M bits to obtain a plurality of quadrature signal coded sequences with a length of M bits, M being greater than N.
3. The signal modulation device according to claim 2 , wherein the value of M is inversely proportional to a peak-to-average ratio corresponding to the baseband coded signal.
4. The signal modulation device according to claim 1 , wherein the modulation module comprises:
a first modulation submodule, connected to the first coding expansion submodule and configured to perform digital-to-analogue conversion, filtering and frequency mixing on the in-phase signal coded sequence to obtain a first sequence;
a second modulation submodule, connected to the second coding expansion submodule and configured to perform digital-to-analogue conversion, filtering and frequency mixing on the quadrature signal coded sequence to obtain a second sequence; and
a processing submodule, connected to the first coding expansion submodule and the second coding expansion submodule respectively and configured to superpose the first sequence and the second sequence and output the radio frequency signal.
5. The signal modulation device according to claim 4 , wherein the first modulation submodule comprises:
a first digital-to-analogue conversion unit, connected to the first coding expansion submodule;
a first filtering unit, connected to the first digital-to-analogue conversion unit; and
a first frequency mixing unit, connected to the first filtering unit and the processing submodule respectively.
6. The signal modulation device according to claim 4 , wherein the second modulation submodule comprises:
a second digital-to-analogue conversion unit, connected to the second coding expansion submodule;
a second filtering unit, connected to the second digital-to-analogue conversion unit; and
a second frequency mixing unit, connected to the second filtering unit and the processing submodule respectively.
7. A terminal, comprising a signal modulation device, wherein the signal modulation device comprises:
a conversion module, configured to convert a baseband coded signal and output an in-phase signal sequence and a quadrature signal sequence;
a coding expansion module, connected to the conversion module and configured to expand the in-phase signal sequence and the quadrature signal sequence respectively and output an in-phase signal coded sequence and a quadrature signal coded sequence; and
a modulation module, connected to the coding expansion module and configured to modulate the in-phase signal coded sequence and the quadrature signal coded sequence and output a radio frequency signal;
wherein the coding expansion module comprises: a first coding expansion submodule and a second coding expansion submodule which are connected to the conversion module respectively; wherein
the first coding expansion submodule expands the in-phase signal sequence and output the in-phase signal coded sequence; and
the second coding expansion submodule expands the quadrature signal sequence and output the quadrature signal coded sequence;
wherein the first coding expansion submodule expands each N-bits coded signal in the in-phase signal sequence and output a plurality of in-phase signal coded sequences; and
the second coding expansion submodule expands each N-bits coded signal in the quadrature signal sequence and outputs a plurality of quadrature signal coded sequences, N being a positive integer;
wherein the value of N is determined by following formula:
N
=
log
2
L
2
;
wherein
L represents the number of sample points corresponding to a modulation mode, and the modulation mode is a modulation mode adopted by the coding expansion module.
8. The terminal according to claim 7 , wherein the first coding expansion submodule expands each N-bits coded signal in the in-phase signal sequence to M bits to obtain a plurality of in-phase signal coded sequences with a length of M bits; and
the second coding expansion submodule expands each N-bits coded signal in the quadrature signal sequence to M bits to obtain a plurality of quadrature signal coded sequences with a length of M bits, M being greater than N.
9. The terminal according to claim 8 , wherein the value of M is inversely proportional to a peak-to-average ratio corresponding to the baseband coded signal.
10. The terminal according to claim 7 , wherein the modulation module comprises:
a first modulation submodule, connected to the first coding expansion submodule and configured to perform digital-to-analogue conversion, filtering and frequency mixing on the in-phase signal coded sequence to obtain a first sequence;
a second modulation submodule, connected to the second coding expansion submodule and configured to perform digital-to-analogue conversion, filtering and frequency mixing on the quadrature signal coded sequence to obtain a second sequence; and
a processing submodule, connected to the first coding expansion submodule and the second coding expansion submodule respectively and configured to superpose the first sequence and the second sequence and output the radio frequency signal.
11. The terminal according to claim 10 , wherein the first modulation submodule comprises:
a first digital-to-analogue conversion unit, connected to the first coding expansion submodule;
a first filtering unit, connected to the first digital-to-analogue conversion unit; and
a first frequency mixing unit, connected to the first filtering unit and the processing submodule respectively.
12. The terminal according to claim 10 , wherein the second modulation submodule comprises:
a second digital-to-analogue conversion unit, connected to the second coding expansion submodule;
a second filtering unit, connected to the second digital-to-analogue conversion unit; and
a second frequency mixing unit, connected to the second filtering unit and the processing submodule respectively.