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Encryption algorithm of encryption OFDM (Orthogonal Frequency Division Multiplexing) based on discrete Hartley transform

A precoding and algorithm technology, applied in the field of precoding algorithms, can solve the problems that peak power cannot be effectively eliminated, system power consumption is complex, system design is complex, and system complexity is high.

Inactive Publication Date: 2013-03-06
DALIAN POLYTECHNIC UNIVERSITY
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Problems solved by technology

However, the current precoded OFDM system makes the system more complex and cannot effectively eliminate the problem of excessive peak power
Therefore, in some environments that require high system power consumption and complex and limited system design, the application of traditional OFDM systems and current precoded OFDM systems is limited

Method used

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  • Encryption algorithm of encryption OFDM (Orthogonal Frequency Division Multiplexing) based on discrete Hartley transform
  • Encryption algorithm of encryption OFDM (Orthogonal Frequency Division Multiplexing) based on discrete Hartley transform
  • Encryption algorithm of encryption OFDM (Orthogonal Frequency Division Multiplexing) based on discrete Hartley transform

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Embodiment approach

[0068] The implementation mode of an embodiment of the present invention is as follows:

[0069] A. In order to describe and understand the embodiment of the present invention in depth, we first compared the principles of the traditional OFDM system and the current precoded OFDM system, as follows:

[0070] Firstly, the basic block diagram of the traditional OFDM system is explained, as shown in Fig. 1(a). In the traditional OFDM system, the binary data to be sent is first coded and mapped into symbols, and then the symbols are grouped to modulate each different orthogonal carrier. Assume that the system uses N carriers for modulation. As shown in Figure 1(a), in the modulation process, the discrete inverse Fourier transform (IDFT, inverse discrete Fourier transform) is used to simplify the system for the signal, as follows

[0071] s=W H X, (1)

[0072] Among them, s and X are signal vectors in time domain and frequency domain respectively, W is a discrete Fourier transfo...

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Abstract

The invention relates to an encryption algorithm of encryption OFDM (Orthogonal Frequency Division Multiplexing) based on discrete Hartley transform, and belongs to the technical fields of information communication and signal processing. Compared with the conventional OFDM system, an IFFT (Inverse Fast Fourier Transform) module which is necessary in an OFDM system is omitted, and the complexity of the system is reduced. At the same time, the diversity gain of frequency selectivity of the system is increased, and the anti-fading performance and the capacity of the system are improved.

Description

[0001] Technical field The present invention relates to a precoding algorithm based on discrete Hartley transform precoding OFDM, which belongs to the technical field of information communication and signal processing. Background technique [0002] Since multi-carrier technology can effectively counter the influence of frequency-selective fading channels in communication systems, especially the proposal of Orthogonal Frequency Division Multiplexing (OFDM, orthogonal frequency division multiplexing) technology, multi-carrier technology has become a wide-band wireless communication, wired communication And the core technology of optical fiber communication system. This is because OFDM has a higher spectrum utilization rate and uses a relatively simple frequency domain equalizer. [0003] However, due to the inherent shortcomings of the OFDM system, its wide application is limited. For example, higher peak power, more sensitive to carrier offset and lower frequency domain divers...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L27/26
Inventor 金基宇欧阳兴金桂月王智森
Owner DALIAN POLYTECHNIC UNIVERSITY
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