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

An OFDM-MSK, CE-OFDM-MSK technology, applied in the field of new optical OFDM modulation, can solve the problems of not realizing continuous phase modulation, not realizing data phase continuity, etc.

Inactive Publication Date: 2012-06-13
BEIJING UNIV OF POSTS & TELECOMM
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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 t...

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

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[0028] The advantages and features of the present invention, as well as the method of carrying out the present invention, may be more readily understood by referring to the following detailed description of exemplary, non-limiting embodiments and accompanying drawings. However, this invention may be embodied in many different forms and should not be construed as limited to the examples set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of the invention to those skilled in the art, and the present invention will only be defined by the appended claims.

[0029] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] figure 1 A complete block diagram of the CE-OFDM-MSK system is given. First, MSK mapping is performed on the source data, and then training sequences and pilots are added, followed by serial-to-parallel c...

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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...

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Application Information

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IPC IPC(8): H04L27/32H04B10/12H04B10/548
Inventor 杨展予顾畹仪喻松兰名荥李健卢健壕
Owner BEIJING UNIV OF POSTS & TELECOMM
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