Signal transmission method and apparatus
AssigneeHuawei Technologies Co., Ltd.
InventorsXu Li, Jingjing Huang, Jiajin Luo
Life of this patent
Estimating the term…
Abstract
This application provides a signal transmission method and apparatus. The method includes: obtaining, by a transmitter side, a first signal with N points; performing signal separation on the first signal with N points, to obtain two groups of signals (for example, a second signal with N points and a third signal with N points); determining four signals with N/2 points based on the two groups of signals obtained through separation, and combining the four signals with N/2 points, to obtain a to-be-sent signal with 3N/2 points; and sending the signal with 3N/2 points to a receiver side, to enable the receiver to restore the first signal with N points from the received signal with 3N/2 points.
Claims18
A method for transmitting a first frequency domain signal with N points of an orthogonal frequency division multiplexing (OFDM) signal from a transmitting communication apparatus to a receiving communication apparatus and for ensuring that a baseband signal of the OFDM signal is a non-negative real number, the method comprising:
- obtaining, by the transmitting communication apparatus, a first signal with N points, wherein N is a positive even integer, the first signal with N points comprising N values corresponding to the N points respectively, and the N values being indexed with i=0, . . . , N−1;
- separating, by the transmitting communication apparatus, the first signal with N points, to obtain two groups of signals, wherein the two groups of signals meet symmetry or antisymmetry after fast fourier transform (FFT) or inverse FFT (IFFT), and separating the first signal with N points comprises:
- determining, by the transmitting communication apparatus, a second signal with N points and a third signal with N points based on the first signal with N points, wherein the second signal with N points is generated by setting each value of the first signal with an even index to 0, and the third signal with N points is generated by setting each value of the first signal with an odd index to 0;
- and
- generating, by the transmitting communication apparatus, an eighth signal with N/2 points based on a fourth signal with N/2 points and a sixth signal with N/2 points, and generating, by the transmitting communication apparatus, a ninth signal with N/2 points based on a fifth signal with N/2 points and the sixth signal with N/2 points, wherein the fourth signal with N/2 points and the fifth signal with N/2 points are determined based on the second signal with N points, and the sixth signal with N/2 points and a seventh signal with N/2 points are determined based on the third signal with N points;
- or generating, by the transmitting communication apparatus, a tenth signal with N/2 points based on the fourth signal with N/2 points and the seventh signal with N/2 points, and generating, by the transmitting communication apparatus, an eleventh signal with N/2 points based on the fifth signal with N/2 points and the seventh signal with N/2 points;
- combining, by the transmitting communication apparatus, the two groups of signals obtained through separation, to obtain a to-be-sent signal with 3N/2 points;
- and
- sending, by the transmitting communication apparatus, the to-be-sent signal with 3N/2 points, to enable the receiver to restore the first signal with N points from the transmitted signal with 3N/2 points, wherein sending the signal with 3N/2 points comprises:
- sending, by the transmitting communication apparatus, a twelfth signal with 3N/2 points, wherein the twelfth signal with 3N/2 points comprises the eighth signal with N/2 points, the ninth signal with N/2 points and the seventh signal with N/2 points, or the twelfth signal with 3N/2 points comprises the tenth signal with N/2 points, the eleventh signal with N/2 points and the sixth signal with N/2 points.
A method for transmitting a first frequency domain signal with N points of an orthogonal frequency division multiplexing (OFDM) signal from a transmitting communication apparatus to a receiving communication apparatus and for ensuring that a baseband signal of the OFDM signal is a non-negative real number, the method comprising:
- receiving, by the receiving communication apparatus, a signal with 3N/2 points, wherein receiving the signal with 3N/2 points comprises:
- receiving, by the receiving communication apparatusdevice, a twelfth signal with 3N/2 points, the twelfth signal comprising 3N/2 values corresponding to the 3N/2 points, and the 3N/2 values being indexed with i =0, . . . , 3N/2-1, wherein N is a positive even integer;
- and
- generating, by the receiving communication apparatus, a nineteenth signal with N/2 points and a twentieth signal with N points by separating first N/2 points and last N points of the twelfth signal;
- determining, by the receiving communication apparatus, based on the received signal with 3N/2 points, two groups of signals obtained by separating the first signal with N points, wherein the determining comprises:
- generating, by the receiving communication apparatus, a second signal with N points based on the twentieth signal with N points;
- and
- generating, by the receiving communication apparatus, a third signal with N points based on the twentieth signal with N points, the second signal with N points and the nineteenth signal with N/2 points;
- and
- restoring, by the receiving communication apparatus, a first signal with N points based on the two groups of signals, wherein the restoring comprises:
- generating, by the communication apparatus, the first signal with N points based on the second signal with N points and the third signal with N points.
A communication apparatus for transmitting a first frequency domain signal with N points of an orthogonal frequency division multiplexing (OFDM) signal from a transmitting communication apparatus to a receiving communication apparatus and for ensuring that a baseband signal of the OFDM signal is a non-negative real number, the communication apparatus comprising:
- a processor, wherein the processor is coupled to a non-transitory memory storing a computer program or instructions, that when executed by the processor, cause the communication apparatus to:
- obtain a first signal with N points, wherein N is a positive even integer, the first signal with N points comprising N values corresponding to the N points respectively, and the N values being indexed with i=0, . . . , N−1;
- separate the first signal with N points, to obtain two groups of signals, wherein the two groups of signals meet symmetry or antisymmetry after fast fourier transform (FFT) or inverse FFT (IFFT), and separating the first signal with N points comprises causing the communicatino apparatus to:
- determine a second signal with N points and a third signal with N points based on the first signal with N points, wherein the second signal with N points is generated by setting each value of the first signal with an even index to 0, and the third signal with N points is generated by setting each value of the first signal with an odd index to 0;
- and
- generate an eighth signal with N/2 points based on a fourth signal with N/2 points and a sixth signal with N/2 points, and generate a ninth signal with N/2 points based on a fifth signal with N/2 points and the sixth signal with N/2 points, wherein the fourth signal with N/2 points and the fifth signal with N/2 points are determined based on the second signal with N points, and the sixth signal with N/2 points and a seventh signal with N/2 points are determined based on the third signal with N points;
- or generate a tenth signal with N/2 points based on the fourth signal with N/2 points and the seventh signal with N/2 points, and generate an eleventh signal with N/2 points based on the fifth signal with N/2 points and the seventh signal with N/2 points;
- combine the two groups of signals obtained through separation, to obtain a to-be-sent signal with 3N/2 points;
- and
- send the to-be-sent signal with 3N/2 points, to enable the receiver to restore the first signal with N points from the transmitted signal with 3N/2 points, wherein sending the signal with 3N/2 points comprises causing the communication apparatus to:
- send a twelfth signal with 3N/2 points, wherein the twelfth signal with 3N/2 points comprises the eighth signal with N/2 points, the ninth signal with N/2 points, and the seventh signal with N/2 points, or the twelfth signal with 3N/2 points comprises the tenth signal with N/2 points, the eleventh signal with N/2 points, and the sixth signal with N/2 points.
Dependencies are inferred from the claim text.