Visible light communication method

摘要

A visible light communication method. Firstly, a plurality of binary logic streams is sequentially received and a serial-to-parallel conversion is performed on them to obtain a plurality of binary signal sets corresponding to each binary logic stream. Then, all the binary signal sets are respectively mapped to obtain the first OFDM symbols in frequency domain. The first OFDM symbols are respectively transformed into the second OFDM symbols in time domain. Then, a parallel-to-serial conversion is performed on the second OFDM symbols. Adequate cyclic prefix is added in each of the second OFDM symbols. Next, the relative intensity of each of the second OFDM symbols is regulated, and then a digital-to-analog conversion is performed on the second OFDM symbols to obtain analog electrical signals. Finally, visible lights respectively corresponding to the analog electrical signals are generated.

主权项

1. A visible light communication method comprising steps of:
sequentially receiving a plurality of binary logic streams, and performing a serial-to-parallel conversion on each said binary logic stream to obtain a plurality of binary signal sets corresponding to each said binary logic stream; respectively mapping said binary signal sets corresponding to each said binary logic stream to a plurality of sub-carrier symbols of a first orthogonal frequency-division multiplexing (OFDM) symbol in frequency domain, thereby obtaining a plurality of said first OFDM symbols, and said sub-carrier symbol is assigned to sub-carriers of each said first OFDM symbol; respectively transforming said first OFDM symbols into a plurality of second OFDM symbols in time domain; performing a parallel-to-serial conversion on said second OFDM symbols; respectively adding a plurality of cyclic prefixes in said second OFDM symbols according to transmission speeds of said second OFDM symbols to respectively obtain a plurality of fourth OFDM symbols; normalizing relative intensity of each said fourth OFDM symbol; multiplying said relative intensity of each said fourth OFDM symbol by a ratio to generate a plurality of third OFDM symbols; and performing a digital-to-analog conversion on said third OFDM symbols to respectively obtain a plurality of electrical analog signals, and respectively generating visible light signals according to said electrical analog signals.