Signal modulation and demodulation method, sending device and receiving device
A technology of signal modulation and receiving equipment, which is applied in the field of communication, can solve the problems of less information and low spectrum efficiency, and achieve the effect of increasing information and improving spectrum efficiency
Pending Publication Date: 2022-06-24
TSINGHUA UNIV
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[0005] This application provides a signal modulation and demodulation method, sending equipment and receiving equipment to solve the problems of less information transmitted at one time and lower spectrum efficiency in the existing pulse position modulation technology
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[0050] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. Where the following description refers to the drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the illustrative examples below are not intended to represent all implementations consistent with this application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as recited in the appended claims.
[0051] First, the terms involved in this application are explained:
[0052] Pulse position modulation: refers to pulse position modulation, referred to as PPM. PPM modulation is a modulation method that uses the relative position of pulses to transmit information, which can be applied to space communication. In optical communication, this modulation method can achieve the highest data transmis...
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The invention provides a signal modulation and demodulation method, a sending device and a receiving device. The method comprises: dividing a signal to be transmitted into N layers by a sending device, N being an integer greater than or equal to 2. The method comprises the following steps of: firstly, respectively modulating a to-be-transmitted signal of each layer by adopting binary pulse position modulation to obtain a modulated signal of each layer, and finally, superposing the modulated signals of each layer and sending the superposed signals to receiving equipment for demodulation. After a receiving device receives a transmission signal, the transmission signal comprises N layers of superposed signals, N is an integer greater than or equal to 2, the binary pulse position is adopted to demodulate the transmission signal, the demodulated signal of each layer is obtained, finally the demodulated signal of each layer is combined, and the combined original transmission signal is obtained. The to-be-transmitted signal is subjected to layered modulation and superposition transmission, so that the information amount sent by the sending device at one time is increased, the information amount received by the receiving device at one time is increased, and the spectrum efficiency is further improved.
Description
technical field [0001] The present application relates to the field of communication technologies, and in particular, to a signal modulation and demodulation method, a sending device, and a receiving device. Background technique [0002] In the communication system, the modulation and demodulation of the signal is a key part of the signal transmission. The signal is converted into a signal suitable for channel transmission through modulation, and the modulated signal is restored to the original signal through demodulation, thereby improving the signal in the communication system. Transmission availability and reliability. [0003] In the prior art, in the process of signal transmission, pulse position modulation (Pulse Position Modulation, PPM) technology is usually used to modulate the signal. PPM uses the position of the time slot where the pulse is located to determine the data information transmitted by the signal, that is, using different time positions. pulses to repr...
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IPC IPC(8): H04B10/524H04B10/69H04B10/116
CPCH04B10/524H04B10/691H04B10/116
Inventor 曹天张洪明宋健
Owner TSINGHUA UNIV