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Method for reducing signal peak-to-average ratio in FBMC system

A signal peak-to-average ratio and data technology, which is applied in the transmission system, multi-carrier system, digital transmission system, etc., can solve the problems of reducing the system data transmission rate, reducing the utilization rate of spectrum resources, and reducing the performance of the system bit error rate, etc., to achieve The effect of improving spectrum utilization, reducing computational complexity, and reducing computational cost

Inactive Publication Date: 2017-07-11
SOUTHEAST UNIV
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Problems solved by technology

This will reduce the utilization of spectrum resources
[0011] (2) Peak regeneration: If the peak-to-average ratio of the signal is reduced and nonlinear processing is used, although the out-of-band interference and in-band noise of the signal can be reduced to a certain extent, the signal is still prone to peak regeneration after filtering
[0012] (3) Transmission rate: use the transmitted codeword set to process the signal, select those codewords that can reduce or minimize the peak average, and then select the codeword set with a lower peak amplitude of the signal from the codeword set for use For transmission, higher peaks can be avoided, but the transmission rate of the signal will also be significantly reduced
But at the same time, the sideband information will reduce the transmission rate of the system data. If the receiving end cannot accurately demodulate the sideband information, it will also reduce the bit error rate performance of the system.

Method used

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  • Method for reducing signal peak-to-average ratio in FBMC system
  • Method for reducing signal peak-to-average ratio in FBMC system
  • Method for reducing signal peak-to-average ratio in FBMC system

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Embodiment Construction

[0062] The present invention will be further described below in conjunction with the accompanying drawings.

[0063] Such as image 3 Shown is a block diagram of the data processing process at the sending end in this example, including the following steps:

[0064] (1) Convert the original data to be sent at the sending end into quaternary data through encoding operations, and then map the converted quaternary data to constellation circles to form data X;

[0065] (2) After serial-to-parallel conversion, the data X is divided into V groups of continuously distributed subcarrier blocks of the same size and mutually disjoint X=[X 1 ,X 2 ,...,X V ] T , X υ Indicates the υth subcarrier block, υ=1,2,...,V;

[0066] (3) From the phase rotation sequence set B={e (2πj / 2)i ,i=0,1} is the υth subcarrier block X υ Choose a phase rotation factor b υ , form the phase rotation factor sequence b=[b 1 ,...,b V ], the υth subcarrier block X υ and the corresponding phase rotation fa...

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Abstract

The present invention discloses a method for reducing the signal peak-to-average ratio in an FBMC system. According to the method, firstly, a signal is pre-processed at a signal transmission end and the data overlapping condition is avoided even after data are multiplied by a phase rotation factor after being subjected to constellation mapping. Secondly, in combination with the conventional PTS method, data are partitioned, and a set of data smallest in peak-to-average ratio among multiple sets of data is selected and transmitted. Therefore, the signal peak-to-average ratio is well reduced. Meanwhile, the signal demodulation is conducted at a receiving end according to the discriminant rule of signals. In this way, the transmission of the sideband information is avoided. According to the technical scheme of the invention, the peak-to-average power ratio of the FBMC system is reduced, while the information demodulation of the receiving end is enabled without the transmission of the phase rotation factor. Under the same condition, the utilization rate of spectrum resources is improved and the use efficiency of the entire system is increased.

Description

technical field [0001] The invention relates to a method for reducing signal peak-to-average ratio through constellation mapping and partial transmission sequences in an FBMC system, and belongs to the field of wireless communication technology research. [0002] Acronyms and key term definitions [0003] Background technique [0004] With the improvement of wireless communication technology, people's requirements for communication quality have also become higher. Because the multi-carrier communication system has the advantages of high spectrum efficiency and flexible spectrum utilization, the multi-carrier communication system has become the main research direction. In a multi-carrier system, when some of the signals are interfered, it will only affect the signal transmission quality of a part of the sub-channels in the parallel transmission signal, and will not affect the entire communication. Although multi-carrier communication has many advantages, the signal has a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/34
CPCH04L27/3411H04L27/3483
Inventor 徐平平柳颖王潍潍肖霖
Owner SOUTHEAST UNIV
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