Equal probability precoding method for system with two transmitting terminals and one receiving terminal based on pulse amplitude modulation

A technology of pulse amplitude modulation and precoding, applied in the field of probabilistic precoding, which can solve problems such as the influence of device nonlinearity and signal distortion, and achieve the effects of saving bandwidth, improving transmission speed and quality, and reducing nonlinear influence

Inactive Publication Date: 2019-01-29
FUDAN UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

For signals with large PAPR, they are easily affected by device nonlinearities, resulting in signal distortion

Method used

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  • Equal probability precoding method for system with two transmitting terminals and one receiving terminal based on pulse amplitude modulation
  • Equal probability precoding method for system with two transmitting terminals and one receiving terminal based on pulse amplitude modulation
  • Equal probability precoding method for system with two transmitting terminals and one receiving terminal based on pulse amplitude modulation

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Embodiment 1

[0029] In the embodiment, a precoding method based on a pulse amplitude modulation two-transmit-one-receive system adopts a pulse-amplitude modulation-based two-transmit-one-receive system. The system mainly consists of two LED lights as the transmitting end, and a PIN photodetector as the Receiver; precoding controls the level and probability of the pulse amplitude modulation signal at the transmitter; after the low-order signals of the two transmitters are transmitted, they are superimposed in the optical domain to generate a high-order signal, which is finally detected by the receiver and processed offline. , to complete signal demodulation. Among them: the precoded transmitter signal adopts pulse amplitude modulation, which satisfies formulas (1)-(2); the probability sum of the occurrence of each level of the transmitter symbol is 1, as shown in formula (3):

[0030]

[0031] A m =(2m-1-M)d,m=1,2,…,M,0≤t≤T, (2)

[0032]

[0033] In the formula, t is time, s(t) is t...

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Abstract

The invention belongs to the technical field of radio-on-fiber communication and optical signal transmission, and specifically relates to an equal probability precoding method for a system with two transmitting terminals and one receiving terminal based on pulse amplitude modulation. The method is based on a system taking two LED lamps as transmitting terminals and taking a PIN photoelectric detector as a receiving terminal. The method specifically comprises the steps that two paths of low-order pulse amplitude modulation signals are transmitted by using the two transmitting terminals, and thetwo paths of signals are superimposed in the optical domain to generate high-order pulse amplitude modulation signals. In addition, the levels of the low-order pulse amplitude signals generated at the transmitting terminals are not equal in probability, and the levels of the high-order pulse amplitude signals generated by the receiving terminal are equal in probability. The equal probability precoding method realizes the equal probability level of the receiving terminal, and the levels can be uniquely demodulated without STBC (Space-Time Block Coding), thereby saving the bandwidth, and improving the resource utilization rate; and the overall peak-to-average power ratio of the signals is reduced, thereby better resisting the nonlinearity in the system, and improving the transmission performance.

Description

technical field [0001] The invention belongs to the technical field of wireless communication over light and optical signal transmission, and specifically relates to an equal-probability precoding method based on a two-transmit-one-receive system based on pulse amplitude modulation. Background technique [0002] With the rapid growth of wireless data demand and the saturation of radio frequency resources, visible light communication has become a strong candidate for the supplementary scheme of traditional radio frequency communication, especially in indoor short-distance communication, which has a very broad application prospect. Traditional visible light communication is designed as a single-input single-output (SISO) point-to-point communication, using a white light LED as a light source at the transmitting end to transmit data, and using a photodiode (PD) or image sensor as a photodetector at the receiving end Convert optical signals to electrical signals. And use simple...

Claims

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Application Information

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IPC IPC(8): H04B7/0413H04B7/0456H04B10/116H04B14/02H04L27/26
CPCH04B7/0413H04B7/0456H04B10/116H04B14/023H04L27/2615
Inventor 迟楠石蒙
Owner FUDAN UNIV
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