Three-dimensional orthogonal frequency-division multiplexing data modulation method and data demodulation method

Abstract

The invention relates to the field of optical fiber communication, discloses a three-dimensional orthogonal frequency-division multiplexing data modulation method and a data demodulation method, and aims to solve the technical problem of incapability of lowering signal PAPR (Peak to Average Power Ratio) under the condition of not influencing other performances of a system in the prior art. The method comprises the following specific steps: performing three-dimensional data constellation points mapping on a bit sequence to be transmitted to obtain an orthogonal frequency-division multiplexing (OFDM) signal based on three-dimensional mapping; performing three-path overlapping on the real parts and imaginary parts of a plurality of time domain signals obtained after performing three-dimensional inverse discrete Fourier transform (3D-IDFT) on a three-dimensional OFDM symbol respectively through a three-dimensional CAP orthogonal filter, and combining to obtain final transmission time domain data; acquiring data to be transmitted through the time domain signal of a 3D-CAP-OFDM system and transmitting the data to be transmitted. By adopting the methods, the technical effect of effectively lowering the signal PAPR under the condition of no influencing the other performance of the communication system is achieved.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to a three-dimensional orthogonal frequency division multiplexing data modulation method and data demodulation method. Background technique [0002] OFDM (orthogonal frequency division multiplexing: Orthogonal Frequency Division Multiplexing) technology is a technology with high spectrum utilization rate, which has great potential value in future high-speed long-distance communication systems, but PAPR (peak-to-average power ratio :Peak to Average Power Ratio) is too high has always been a very serious defect, higher PAPR puts forward very high requirements on the amplifier of the system, the transmission distance of the optical fiber, etc. There are many methods for reducing PAPR, such as transmission systems based on clipping, transmission systems based on partial transmission sequences, transmission systems based on carrier interference, and so on. [0003] However, in...

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Problems solved by technology

[0004] The present invention provides a data transmission method and a data receiving method to solve the technical problem that PAPR cannot be reduced at the same time without affecting other performances of the system in the prior art

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