Block-interleaved frequency division multiple access-based passive optical network transmission method

Abstract

The present invention discloses a block-interleaved frequency division multiple access-based passive optical network transmission method. The method includes the following steps that: channel response is measured through a DSP (digital signal processing) method; at a transmitting end, user information is modulated, pre-channel compensation is performed on a downlink at the symbol blocks of an OLT (optical line terminal), in an uplink, rear channel compensation is performed on the OLT by inserting a training sequence, a modulated symbol block of which the length is P is repeated by K times, a symbol block of which the length is P*K is subjected to the effects of M paths of different shift factors, so that M paths of signals are generated and are multiplied by corresponding phase shift factors, and phase shift output is added, so that a B-IFDM (block interleaved frequency division multiple access) symbol block can be obtained, a cyclic prefix is added, shaping and filtering are carried out, and obtained signals are transmitted; and at a receiving end, after operation such as filtering, down conversion, de-mapping and decoding is performed, transmitted original bit information is restored. With the method of the invention adopted, requirements of the transmitter of an ONU end (optical network unit), for modulators and amplifiers, are lowered, the cost of a user side can be saved, the implementation of B-IFDMA is simple, and the complexity of the algorithms and devices of the transmitting end is decreased.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to a passive optical network transmission method based on block interleaving frequency division multiple access. Background technique [0002] In 2009, the Nobel Prize Committee of the Royal Swedish Academy of Sciences announced that it would award the 2009 Nobel Prize in Physics to a Hong Kong scientist, Charles K. Kao, and two American scientists. Scientist Charles K. Kao was awarded for his "groundbreaking achievements in the transmission of light in the field of optical communications." As we all know, optical fiber communication technology has become one of the main pillars of modern communication, plays a pivotal role in modern telecommunication networks, and greatly affects people's daily life. The principle of optical fiber communication is: at the sending end, the transmitted information (such as voice) must first be converted into an electrical signal,...

AI Technical Summary

Problems solved by technology

The advantage of WDM-PON is that it can achieve higher working bandwidth, and has certain advantages in network management and system upgrades. Its disadvantage is that it is very expensive, and there is still a long way to go before industrialization and large-scale applications.

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