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Peak power optimization method and transmission system in ofdm system

A technology of peak power and optimization method, applied in transmission systems, multi-frequency code systems, digital transmission systems, etc., can solve problems such as increasing system complexity, and achieve the effect of reducing computational complexity and improving overall performance

Active Publication Date: 2019-05-17
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] Although the selective mapping technology improves the PAPR performance of the OFDM system and the transmission signal is not distorted, the introduction of this technology greatly increases the complexity of the system

Method used

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  • Peak power optimization method and transmission system in ofdm system
  • Peak power optimization method and transmission system in ofdm system
  • Peak power optimization method and transmission system in ofdm system

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Experimental program
Comparison scheme
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Embodiment 1

[0056] This embodiment discloses a peak power optimization method in an OFDM system, such as figure 1 shown, including the following steps:

[0057] (1) PSK modulation is carried out to the input binary transmission signal data;

[0058] (2) Use two sets of different phase factor sets P 1 and P 2 Generate two different phase factor rotation sequences respectively;

[0059] Among them, the specific method of generating two sets of different phase factor rotation sequences is:

[0060] Choose two sets of phase factors P 1 ={±1} and P 2 ={±j}, use set P 1 Generate a phase factor rotation sequence whose length is equal to the number of subcarriers in the OFDM system; use the set P 2 Generate b rotation sequences of phase factors whose length is equal to the number of subcarriers in the OFDM system; elements in each rotation sequence are randomly selected from elements of the corresponding phase factor set.

[0061] (3) The signal data generated in step (1) are weighted wit...

Embodiment 2

[0086] The purpose of this embodiment is to provide a computer system.

[0087] A computer system, comprising a memory, a processor, and a computer program stored on the memory and operable on the processor, when the processor executes the program, the following steps are implemented, including:

[0088] Receive the original binary transmission signal, perform phase shift keying modulation, and obtain the modulated signal;

[0089] performing weighting processing on the modulated signal by using two sets of different phase factor rotation sequences;

[0090] Inverse fast Fourier transform is performed on the weighted modulated signal to obtain two sets of time-domain signal sequences;

[0091] Selecting a deformation parameter set, using the deformation parameter set to carry out weighting processing on the two groups of time-domain signal sequences respectively, to obtain two groups of OFDM candidate signal sequences, which are stored in the first cluster and the second cluste...

Embodiment 3

[0095] The purpose of this embodiment is to provide a computer-readable storage medium.

[0096] A computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the following steps are performed:

[0097] Receive the original binary transmission signal, perform phase shift keying modulation, and obtain the modulated signal;

[0098] performing weighting processing on the modulated signal by using two sets of different phase factor rotation sequences;

[0099] Inverse fast Fourier transform is performed on the weighted modulated signal to obtain two sets of time-domain signal sequences;

[0100] Selecting a deformation parameter set, using the deformation parameter set to carry out weighting processing on the two groups of time-domain signal sequences respectively, to obtain two groups of OFDM candidate signal sequences, which are stored in the first cluster and the second cluster respectively;

[0101] Add the two g...

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Abstract

The invention discloses a peak power optimization method and a transmitting system in an OFDM system. The method comprises the following steps: receiving an original binary transmission signal, performing phase shift keying modulation to obtain a modulated signal; two groups of different phase factor rotation sequences are respectively used for weighted processing of the modulated signal. Two setsof time domain signal sequences are obtained by inverse fast Fourier transform of the weighted modulated signals. A deformation parameter set is selected, and the two sets of time-domain signal sequences are weighted by the deformation parameter set to obtain two sets of OFDM candidate signal sequences, which are stored in the first cluster and the second cluster respectively. The two sets of OFDM candidate signal sequences are added and normalized to obtain a new OFDM candidate signal sequence, which is stored in a third cluster. The signal sequence with the best PAPR performance is selectedfrom the three candidate signals for transmission. The invention not only can obtain the PAPR performance similar to the traditional selective mapping method, but also reduces the computational complexity of the system.

Description

technical field [0001] The disclosure belongs to the technical field of digital communication, and in particular relates to a method for optimizing peak power in an OFDM system and a transmitting system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier transmission technology that converts high-speed data signals into low-speed sub-carrier data for processing in a wireless environment. Its basic operating principle is to divide a given channel into multiple mutually orthogonal sub-channels in the frequency domain, and then distribute the high-speed transmission data streams to the low-speed sub-channels through the serial-to-parallel conversion port, and then in each One sub-channel is modulated with one orthogonal sub-carrier. Therefore, OFDM technology has shown great advantages in some aspects by virtue of its ability to convert high-speed data signals into low-speed data information for transmission, such as: information...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2614H04L27/2621
Inventor 王灵垠周壮
Owner UNIV OF JINAN
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