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Method for achieving Flip-OFDM through fast Hartley transformation

A Hartley and fast technology, applied in the field of Flip-OFDM generation, can solve the problems of increasing implementation complexity and achieve the effect of reducing complexity

Inactive Publication Date: 2014-08-27
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
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Problems solved by technology

[0006] 2) The existing Flip-OFDM expands one symbol period to two symbol periods, adding and removing CP, channel estimation and other operations need to be performed twice, which increases the complexity of implementation

Method used

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  • Method for achieving Flip-OFDM through fast Hartley transformation
  • Method for achieving Flip-OFDM through fast Hartley transformation
  • Method for achieving Flip-OFDM through fast Hartley transformation

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Embodiment Construction

[0012] figure 1 It is a block diagram of the improved Flip-OFDM based on Hartley transform, where the inverse Hartley transform (Inverse-FHT) and Hartley transform are defined as:

[0013] x n = 1 N Σ k = 0 N - 1 X k cas ( 2 πkn N ) , n = 0,1 , · · · , N - 1 - - - ( 1 )

[0014] X k = 1 N Σ k ...

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Abstract

The invention relates to a method for achieving the Flip-OFDM through fast Hartley transformation (FHT), and belongs to the technical field of photo-communication. As the FHT is real transformation, multiplexing and demultiplexing of multi-carriers are achieved through the FHT, and the algorithm complexity is only a half of that of traditional fast Fourier transformation. By means of the method, symbol overturning operation can be achieved within one symbol period, plus symbols are obtained, but two symbol periods are needed in a traditional scheme. Operation such as CP adding, CP removing and delaying is only a half of that of the traditional scheme. The method has the advantages of being low in implementation complexity and is suitable for systems with high requirements for cost and implementation complexity, and the systems include passive optical networks, the indoor optical wireless communication system, the data center interconnection system and the like.

Description

technical field [0001] The invention belongs to the field of high-speed optical communication, in particular to a method for generating Flip-OFDM. Background technique [0002] With the development of Internet technology and the vigorous development of various video services, the capacity requirements of optical transmission and access systems are also increasing. In order to meet the ever-increasing capacity requirements of optical transmission systems, optical OFDM (O-OFDM) technology has been extensively studied in recent years. O-OFDM technology has the advantages of high spectral efficiency, strong ability to resist dispersion and polarization mode dispersion, etc. O-OFDM technology is divided into two categories: coherent OFDM system and intensity modulation-direct detection OFDM (IM / DD O-OFDM) system. Among them, the IM / DD O-OFDM system has a simple structure and low implementation cost, and is suitable for systems that require high implementation complexity and cos...

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Application Information

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IPC IPC(8): H04L27/26
Inventor 乔耀军周骥蔡浞纪越峰
Owner BEIJING UNIV OF POSTS & TELECOMM
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