Constant-envelop light OFDM-MSK (orthogonal frequency division multiplexing-minimum shift keying) modulation method

Abstract

The invention discloses a constant-envelop (CE) light OFDM-MSK (orthogonal frequency division multiplexing-minimum shift keying) modulation method, which is capable of minimizing PAPR (peak to average power ratio) and dropping the border of the frequency spectrum quickly so as to reduce interference among carrier waves, enhances resistance capability of the light OFDM system to interference of nonlinearity and subcarriers and accordingly improves the performances of long-distance large-capacity light OFDM transmission system. The modulation method includes the following steps: (1) a transmitting end generates OFDM-MSK signals; (2) the signals generated in the step (1) are subjected to digital-to-analogue conversion and optical phase modulation so as to generate CE-OFDM-MSK light signals to be sent to optical fibers; (3) a receiving end receives the CE-OFDM-MSK light signals by means of relative detection and the CE-OFDM-MSK light signals are subjected to phase modulation to be OFDM-MSK signals; and (4) source end data are acquired by means of modulation reverse to the modulation process of generating the OFDM-MSK signals.

Description

technical field [0001] The present invention relates to a new optical OFDM modulation format method, more specifically, relates to a novel optical OFDM combining the advantages of constant envelope OFDM (CE-OFDM) modulation and minimum frequency shift keying OFDM (OFDM-MSK) modulation modulation method. Background technique [0002] Optical Orthogonal Frequency Division Multiplexing (O-OFDM) has become a hot research technology in the field of optical communication because of its advantages such as resistance to chromatic dispersion and polarization mode dispersion, high spectrum utilization and simple equalization. In addition, the rapid development of digital signal processing (DSP) technology in recent years has further promoted the application of OFDM technology in the field of optical communication. Long-distance and large-capacity transmission of information has always been the pursuit of the goal in the field of optical communication, but due to OFDM's high peak-to-a...

AI Technical Summary

Problems solved by technology

However, the existing system has not realized the real continuous phase modulation because the phase continuity of the data on each subcarrier has not been realized, and the minimum frequency shift keying OFDM (OFDM-MSK) modulation method can make the data phase continuous on the subcarriers, thereby Fully realizes OFDM-CPM modulation, achieves the rapid decline of the edge of the spectrum, and significantly reduces the effect of carrier frequency offset (CFO), ICI and intersymbol interference (ISI)

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