A Dual Spatial Modulation Method for Wireless Optical Communication
A wireless optical communication, dual-space technology, applied in fiber optic radio, fiber optic transmission, electrical components, etc., can solve the problems of OGSM bit error performance is not ideal, to achieve the effect of improving spectrum efficiency and transmission rate, and improving bit error performance
Active Publication Date: 2021-09-24
LANZHOU UNIVERSITY OF TECHNOLOGY
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But the bit error performance of OGSM is not ideal, and only its performance in indoor visible light communication is analyzed
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[0031] The present invention proposes a dual-space modulation method for wireless optical communication. In this method, the transmitting end transmits a pulse position modulation (PPM) signal and a pulse amplitude modulation (PAM) signal by simultaneously activating two lasers each time, and the activated laser Carry different information; the receiving end adopts maximum likelihood decoding (ML) to detect the signal. The present invention will be described in detail below with specific embodiments in conjunction with the accompanying drawings.
[0032] The present invention achieves through following technical measures:
[0033] The present invention is a dual-space modulation method for wireless optical communication. Its purpose is to use PPM modulation and PAM modulation to construct a high transmission rate method suitable for wireless optical communication, and deduce the upper bound of the theoretical bit error rate of the method. Analysis Factors affecting its transm...
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A dual-space modulation method for wireless optical communication, the purpose of which is to establish a dual-space modulation method for wireless optical communication by using PPM modulation and PAM modulation, thereby improving the transmission rate of the wireless optical communication system. This method mainly transmits pulse position modulation (PPM) and pulse amplitude modulation (PAM) respectively by simultaneously activating two lasers each time, thereby increasing the transmission rate of the system. First, the transmitting end uses the characteristics of the laser mapping vector, M-PPM modulation symbol and L-PAM modulation symbol to construct the transmitting signal matrix, and then the transmitted optical signal reaches the receiving end through the turbulent channel and is received by the optical detector. Assuming that the channel state information is known at the receiving end, that is, when H is known, the maximum likelihood decoding algorithm is used for signal detection and the original bit information is recovered. On this basis, the upper bound of the theoretical bit error rate of this method in the log-normal channel is deduced by using the joint bound technique.
Description
technical field [0001] The invention relates to a dual-space modulation (DSM) method for wireless optical communication, which transmits pulse position modulation signals and pulse amplitude modulation signals respectively by activating two lasers at the same time each time, thereby increasing the system transmission rate, and belongs to the technical field of wireless optical communication. Background technique [0002] Wireless optical communication has become a new type of broadband access technology because of its good confidentiality and excellent cost performance. With the rapid increase of data transmission traffic, people put forward higher requirements on the capacity and transmission rate of wireless optical communication systems; at the same time, the existence of atmospheric turbulence will seriously affect the effectiveness and reliability of wireless optical communication systems. Optical spatial modulation technology not only uses traditional digital modulatio...
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IPC IPC(8): H04B10/2575H04B10/50H04B10/524H04B10/54
CPCH04B10/25752H04B10/503H04B10/524H04B10/54
Inventor 王惠琴杨顺信曹明华曹建锋王玺吕佳芸武鑫
Owner LANZHOU UNIVERSITY OF TECHNOLOGY