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A system and method for polar coordinate coding modulation

A technology of coding modulation and polar coordinates, which is applied in the field of polar coordinate coding and modulation systems, can solve problems such as increasing system complexity and increasing the complexity of digital signal processing algorithms, and achieve the effect of improving system performance

Active Publication Date: 2019-08-27
WUHAN POST & TELECOMM RES INST CO LTD
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Problems solved by technology

[0003] In order to achieve low-cost and high-spectrum-efficiency optical modulation and coding, researchers have proposed many different schemes under the framework of direct modulation and direct detection technology, such as modulation and coding technology based on CAP (Carrierless Amplitude / phase Modulation, carrierless amplitude-phase modulation), Modulation and coding technology of optical orthogonal frequency division multiplexing (DCO-OFDM) based on DC bias. These methods either increase the complexity of system construction or increase the complexity of digital signal processing algorithms for received signals. For low-cost applications Direct adjustment and direct inspection systems are not a good choice

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  • A system and method for polar coordinate coding modulation

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Embodiment Construction

[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0037] like figure 1 and image 3 As shown, the polar coordinate coding and modulation system of the present invention can be applied to a direct modulation and direct detection optical communication system, and is divided into a transmitting end 1 and a receiving end 2 .

[0038] like figure 1 As shown, the transmitting end 1 includes a digital signal processor 11 , a digital-to-analog converter 12 and a direct dimming optical transmitter 13 . The digital signal processor 11 at the sending end includes a mapping module 111 , a computing module 112 , an encoding module 113 and a framing module 114 .

[0039] Specifically, the mapping module 111 is configured to perform constellation mapping encoding on the original data stream to obtain a QAM signal. The calculation module 112 is used to form data symbols according to the QAM signal, where...

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Abstract

The invention discloses a system and method for polar coordinate coding modulation, and relates to an optical communication system with direct modulation and direct detection. At a transmitting end, QAM signals are obtained from an original data stream, a QAM signal having a length of several points is used to form a data symbol, the amplitude and phase of the QAM signal in each frame signal are calculated, re-coding is performed respectively according to the probability distributions of amplitude and phase values, then the coded values of the amplitude and phase information are combined intonew data symbols to form a data frame for transmission, and then an optical signal is sent out; and at a receiving end, the received optical signal is subjected to photoelectric conversion, data frameextraction and channel compensation, then the amplitude and phase information is recovered according to a decision threshold obtained by the probability coding, and the original data stream is recovered through the recovered original QAM signal. On the basis of maintaining the complexity of the original system and the complexity of the algorithm, the system and method of the invention realize a modulation and coding scheme with high spectrum efficiency under the optical communication system architecture with direct modulation and direct detection through polar coordinate coding technology andprobability coding technology.

Description

technical field [0001] The invention relates to an optical communication system of direct modulation and direct detection, in particular to a system and method of polar coordinate coding modulation. Background technique [0002] In optical communication networks such as short-distance transmission and access, due to cost constraints, the coding and modulation technology of direct modulation and direct detection is mainly used for network design. This scheme has been widely used due to its low cost and simple structure. With the rapid development of network communication capacity requirements, the original OOK (On-Off Keying, binary on-off keying) modulation and coding method with low spectral efficiency can no longer meet the existing high-speed communication network. With the emergence of optical coherent communication technology, modulation and coding schemes with high spectral efficiency such as OFDM (Orthogonal Frequency Division Multiplexing, orthogonal frequency divis...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/516H04B10/532
Inventor 杨超
Owner WUHAN POST & TELECOMM RES INST CO LTD
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