Optical orthogonal frequency division multiplexing (OFDM) dynamic allocation-based passive access network system and method

Abstract

The invention provides an optical orthogonal frequency division multiplexing (OFDM) dynamic allocation-based passive access network system and a method thereof. In the system, multiple carriers generated by an optical multi-carrier generating unit included in a signal sending unit are input to an OFDM generating unit and then transmitted to a link unit, and signals are subjected to polarization multiplexing, fiber channel transmission and polarization demultiplexing in the link unit; and a signal matching and receiving unit acquires radio-frequency signals carrying information by using a signal detection module, and the information required by a user is demodulated through a signal demodulation processing unit. Dynamic subcarrier allocation of optical OFDM access can be realized by adopting the method and the system, wherein the sequential watermarking detection algorithm (SWDA) adopted by the system can dynamically adjust the distribution of each subcarrier in OFDM symbols, and an optimized access network under a low-complexity frame protocol is realized.

Description

technical field [0001] The invention relates to optical communication technology, in particular to an optical OFDM dynamic distribution access network system and a method thereof. Background technique [0002] With the rapid and continuous development of the Internet, high-bandwidth applications such as video conferencing, real-time games, and IPTV continue to emerge, especially the proposal of triple play services, which puts forward higher requirements for the bandwidth of the access network . The optical fiber access method has gradually been favored by global operators and users due to its huge bandwidth advantages, especially the passive optical network technology (PON, Passive Optical Network) has been widely deployed and applied due to its pure media technology. The passive optical network technology solves the bottleneck problem of the last mile in the communication network. In the future upgrade plan, the bit rate can be further increased to realize the gigabit sym...

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Problems solved by technology

[0013] However, due to the different channel environments and application scenarios of different users, the requirements for received signals are also different. This system cannot dynamically allocate carrier resources according to user needs, that is, the utilization rate of carrier resources and bandwidth resources is low, reducing the The universality of the access network cannot realize the optimized access of the network

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