Method for reducing peak-to-average power ratio of OFDM (orthogonal frequency division multiplexing)/OQAM system based on selective sequence

A technology with peak-to-average power ratio and selectivity, which can be used in multi-frequency code systems and other directions, and can solve problems such as poor results.

Active Publication Date: 2011-11-09
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, in OFDM / OQAM systems, time-domain symbols overlap
Therefore, we reduce the PAPR of each OFDM / OQAM symbol independently, which will affect other symbols, resulting in a poor final PAPR reduction

Method used

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  • Method for reducing peak-to-average power ratio of OFDM (orthogonal frequency division multiplexing)/OQAM system based on selective sequence
  • Method for reducing peak-to-average power ratio of OFDM (orthogonal frequency division multiplexing)/OQAM system based on selective sequence
  • Method for reducing peak-to-average power ratio of OFDM (orthogonal frequency division multiplexing)/OQAM system based on selective sequence

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[0037] Parameter description: The OFDM / OQAM system adopts QAM modulation with q=4, the number of subcarriers N=64, and the prototype filter parameter K=4. The number of phase rotation sequences generated in the selective sequence is U=16 and U=128 respectively .

[0038] Simulation results show that the ability of the present invention to reduce PAPR is far better than the ability of the traditional selective mapping method to directly apply to OFDM / OQAM system to reduce PAPR. At the same time, the present invention does not affect the power spectral density of OFDM / OQAM signals. Moreover, due to the reduction of PAPR, the working efficiency of HPA is improved and power consumption is saved.

[0039] When U=128, in Pr{PAPR>PAPR 0}=10 -3 , using the selective sequence method proposed by the present invention can obtain a PAPR reduction of 4.7 dB; using the original selective mapping method can obtain a PAPR reduction of 1.3 dB. Obviously, when the parameters are the same, the...

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Abstract

The invention discloses a method for reducing a peak-to-average power ratio of an OFDM (orthogonal frequency division multiplexing)/OQAM (orthogonally multiplexed QAM) system based on a selective sequence. The method comprises the following steps of: coding, interleaving and modulating an input data stream, performing up-sampling on the obtained information source data packets, and then, enablingthe information source data packets to respectively pass through a filter bank; respectively selecting an optimized phase rotation sequence for a time domain signal of each obtained data block in order; and finally, selecting a signal, of which the peak-to-average power ratio is lowest, for transmission, and transmitting information of the phase rotation sequence as sideband information. The method provided by the invention can effectively lower the peak-to-average power ratio of the OFDM/OQAM system without influencing the power spectral density and the error rate performance of the system, improve work efficiency an HPA (high-power amplifier) and reduce energy consumption.

Description

technical field [0001] The invention belongs to the technical field of wireless and wired communication of an Orthogonal Frequency Division Multiplexing (OFDM / OQAM) system based on offset quadrature amplitude modulation, and specifically relates to a method for reducing the peak-to-average power ratio of the OFDM / OQAM system by using a selective sequence. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM / OQAM) technology based on Offset Quadrature Amplitude Modulation (OFDM / OQAM) technology is a promising multi-carrier modulation technology, because of its advantages of high spectral resolution and large capacity data transmission rate, it has been widely used. focus on. Compared with traditional OFDM systems, some technical advantages of OFDM / OQAM systems can be summarized as follows: 1) subcarrier allocation can be performed well when users are not synchronized; 2) by designing prototypes that meet (approximately) perfect reshaping conditions ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 江涛周洋黎偲
Owner HUAZHONG UNIV OF SCI & TECH
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