| CPC H04B 10/11 (2013.01) | 8 Claims |
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1. A fiber enabled optical wireless communication (FE-OWC) method, wherein the FE-OWC method, based on an FE-OWC system, calculates a link budget of a single link transmission and establishes a channel model of an electrical signal transmission between transceiving ends;
wherein a base station and a user terminal of the FE-OWC system are both configured with an FE-OWC apparatus, wherein one of multi-user MIMO or massive MIMO or beam division multiple access (BDMA) optical wireless communication between the base station and the user terminal is implemented;
wherein the FE-OWC apparatus comprises an optical antenna and one or more optical chains;
wherein the optical antenna comprises an optical fiber transceiving port array and a lens or a reflecting mirror, wherein an optical fiber transceiving port of the optical fiber transceiving port array comprises an optical fiber port and a micro-lens, and to expand an angular range of optical signals, the micro-lens is arranged adjacent to the optical fiber port, wherein the optical signals are transmitted and received by the optical fiber port;
in a process of transmitting a first optical signal of the optical signals, the first optical signal is transmitted by a single optical fiber port of the optical fiber transceiving port array, and then the optical signal is refracted by the micro-lens to generate a first optical beam of optical beams; the first optical beam is further refracted by the lens or reflected by the reflecting mirror, resulting the first optical beam being transmitted in a direction and having a predetermined angular range; wherein the optical beams are refracted or reflected to different directions, and wherein the optical beams are transmitted by different optical fiber transceiving ports of the optical fiber transceiving port array;
in a process of receiving a second optical signal, the optical beams are received from different directions and are refracted by the lens or reflected by the reflecting mirror, then the micro-lens refracts a second optical beam of the optical beams within a predetermined angular range into the second optical signal received by a corresponding optical fiber port of the optical fiber transceiving port array, wherein different optical fiber transceiving ports of the optical fiber transceiving port array receive the optical signals from different directions; and
the optical fiber transceiving port array and the lens or the reflecting mirror are configured to generate the optical beams in different directions, different optical beams cover different areas, and all the optical beams cover a communication area, wherein all the optical beams are generated by the optical fiber transceiving port array, such that a full-beam coverage of the communication area is implemented;
wherein the optical antenna is configured to transmit and receive the optical signals and the optical beams to and from different directions; the optical antenna is connected to the optical chains by an optical fiber directly, or the optical antenna is connected to the optical chains by an optical switching unit; the optical chains are configured to implement a mutual conversion between an optical signal and an electrical signal; and a first single FE-OWC apparatus communicates with a second single FE-OWC apparatus or a set of FE-OWC apparatuses;
wherein the link budget comprises an electro-optic conversion at a transmitting end, an optical wireless channel gain, an optical-electro conversion at a receiving end, and an electrical noise at the receiving end; an electro-optic conversion part at the transmitting end establishes a relationship between an optical power and an input electrical signal based on an optical-electro property of an electro-optic conversion device, wherein the optical power is output by the transmitting end; the optical wireless channel gain is a wireless channel gain between an optical fiber transceiving port at the transmitting end and an optical fiber transceiving port at the receiving end; an optical-electro conversion part at the receiving end considers two processes of the receiving optical signal being amplified by a first optical amplifier and detected by a photodetector, and establishes a conversion relationship between an input optical signal and an output electrical signal at the receiving end; the electrical noise at the receiving end comprises an electrical noise introduced by a second optical amplifier and the photodetector, and a relationship between signal power and noise power in an electrical signal received by a single link is established; based on a single link budget, a complete channel model for transmitting the electrical signal from the transmitting end to the receiving end is established; and based on the channel model, the multi-user MIMO or massive MIMO or BDMA optical wireless communication method is implemented between a base station and user terminals.
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