AR model method and apparatus for lowering OFDM system peak-to-average power ratio

A technology of peak-to-average power ratio and AR model, which is applied in the field of communication and can solve the problems of increasing the complexity of OFDM systems

Inactive Publication Date: 2007-01-03
XIDIAN UNIV
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Problems solved by technology

Although it is possible to restrict b v The value of , using the appropriate segmentation method and sub-optimization algorithm to reduce the computational complexity, but the complexity of the OFDM system is still greatly increased

Method used

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  • AR model method and apparatus for lowering OFDM system peak-to-average power ratio
  • AR model method and apparatus for lowering OFDM system peak-to-average power ratio
  • AR model method and apparatus for lowering OFDM system peak-to-average power ratio

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Embodiment Construction

[0059] The present invention will be described in further detail below with reference to the accompanying drawings.

[0060] refer to figure 1 , for the AR model method of the present invention in the OFDM system, proceed as follows:

[0061] In the first step, according to the OFDM system parameters, coordinate the degree of PAPR reduction and system complexity, and select the AR model order p;

[0062] OFDM system parameters mainly include: bandwidth, bit rate and delay extension.

[0063] The delay spread directly determines the length of the guard interval, and the general guard interval is 2 to 4 times the mean square value of the delay spread. Once the guard interval is determined, the length of the symbol period can be fixed. Generally, the length of the symbol period is selected to be 5 times the length of the guard interval, so that the SNR loss caused by inserting the guard interval is only about 1dB. After the symbol period and the guard interval are determined, ...

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Abstract

This invention discloses an AR model method and a device for reducing mean power ratio of the OFDM system, which converts the parallel input sequences of the OFDM modulation signals to signals similar to white noises to reduce its self-correlation so as to reduce the PAPR of the OFDM system and complexity of computation, in which, an AR model mapping device is added at the sending end and an inverse AR model mapping device is added at the receiving end and the AR model mapping device includes an AR model unit, a mean power regulating parameter unit, a function transferring unit, a difference equation unit, a sideband information combination unit and a combining unit, the inverse AR model mapping device includes a separating unit, a sideband information splitting unit, a function transferring unit and a difference equation unit, which only needs one time of IFFT conversion and linear transformation to reduce the mean power ratio of a system peak so as to reduce the complexity of the system.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to the problem of peak-to-average power ratio PAPR (Peak-to-Average Power Ratio) in an OFDM (Orthogonal Frequency Division Multiplexing) communication system. OFDM system peak-to-average power ratio and system complexity method. Background technique [0002] Orthogonal frequency division multiplexing OFDM technology is considered to be one of the core technologies of the fourth generation mobile communication 4G because of its efficient spectrum utilization and good anti-multipath fading performance. At present, OFDM technology has been used in asymmetric digital subscriber line (ADSL), digital audio broadcasting (DAB) and digital television broadcasting (DVB), mobile communications, and power line broadband data communications have been widely used. [0003] The basic principle of OFDM is to distribute high-speed data streams to several sub-channels with relatively low transmi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04L27/26
CPCY02D30/70
Inventor 杨刚王科研
Owner XIDIAN UNIV
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