Visible light point-to-point and broadcast communication system signal generation and capacity computing method

Abstract

The invention discloses a visible light point-to-point and broadcast communication system signal generation and capacity computing method, relates to the technology of visible light communication andis used for solving the problem that the method that at present, many researchers relax constraints as a peak power constraint and a mean optical power constraint to search approximation of the optimum transmission signal is not practicable. For the visible light communication, a point-to-point channel capacity and multiuser channel reachable rate domain is still an open problem. At present, the researchers devote themselves to search an excellent enough estimation method, an upper bound and a lower bound. The SISO point-to-point and SISO multiuser-targeted visible light point-to-point and broadcast communication system signal generation and capacity computing method is provided. The transmission signal generation method has a closed expression and satisfies the constraints for limited peak power, limited mean optical power and limited mean electric power. The method can be proved to be superior to the other method in theory. The method is simple in form and is easy to apply.

Description

technical field [0001] The invention relates to visible light communication technology, specifically, a method for signal generation and capacity calculation of visible light point-to-point and broadcast communication systems. Background technique [0002] Visible light communication is a new type of wireless communication technology. Compared with the existing radio frequency wireless communication technology, visible light communication technology has high transmission rate, rich bandwidth resources without authorization, low energy consumption, no radio electromagnetic interference, and good confidentiality. A little, so the academic and industrial circles of various countries have invested a lot of manpower and material resources in this field, and have achieved certain phased results. In the future, visible light communication technology can provide high-speed and reliable wireless network coverage in densely populated areas, such as airports, stations, and shopping mal...

AI Technical Summary

Problems solved by technology

The optimal transmission signal of radio frequency wireless communication is a Gaussian distribution that satisfies the constraint of average electric power. This transmission signal generation method does not meet the constraints of visible light communication.

According to existing research, the optimal transmit signal that satisfies the three constraints of visible light communication is a finite discrete distribution, but the values ​​and probabilities of random variables in the distribution can only be obtained by exhaustive search, and the closed-form expression, making it difficult to apply this method to important areas such as power allocation and resource scheduling

[0006] At present, many researchers relax the constraints into peak power constraints and average optical power constraints to find the approximation of the optimal transmit signal, but this method is not practical

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