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A New Method for Reducing Peak-to-Average Ratio of stbc MIMO-OFDM System

A MIMO-OFDM, peak-to-average ratio technology, applied in the field of adaptive cross-antenna rotation and negation, can solve the problem of PAPR reduction limit, computational complexity reduction, fixed value, etc., to reduce the number of iterations and computational complexity. Effect

Inactive Publication Date: 2016-04-13
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

However, the number of permutations in this method is too large. Although a more practical sequential suboptimal CARI (SS-CARI) and random suboptimal CARI (RS-CARI) solution is proposed, its computational complexity is reduced, but its PAPR reduction got restricted
The document "Yi-ShengSu, Tsung-ChengWu, Chung-HsuanWang, and Min-KuanChang, "ALow-ComplexityCross-AntennaRotationandInversionSchemeforPAPRReductionofSTBCMIMO-OFDMSystems", IEEE16thInternationalWorkshoponComputerAidedModelingandDesignofCommunicationLinksandNetworks, pp.31-35, 2011"proposed a RICE-CACA Solution, although this solution reduces a certain degree of complexity and PAPR, but its parameter setting is a fixed value

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  • A New Method for Reducing Peak-to-Average Ratio of stbc MIMO-OFDM System
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  • A New Method for Reducing Peak-to-Average Ratio of stbc MIMO-OFDM System

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[0041] Provide the specific implementation method of this patent below:

[0042] Step 1 inputs the original signal, and the complex baseband signal of the MIMO-OFDM system can be expressed as:

[0043] x i ( t ) = 1 N Σ n = 0 N - 1 X n e j 2 πf n t , 0 ≤ t ≤ N T - - - ( 1 )

[0044] In formula (1), N represents the number of subcarriers, i represents the transmitting antenna, and f n =nΔf is...

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Abstract

The invention discloses a novel method for reducing a peak-to-average ratio of an STBC (Space Time Block Code) MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) system, and provides a self-adaption cross-antenna rotation and inversion method based on STBC. A PAPR (Peak-to-Average Power Ratio) of an MIMO-OFDM technology can be reduced. The method comprises the steps that the size of a weight factor is adjusted continuously according to a PAPR variation trend and the variation quantity; the operation probability of a signal subblock executing rotation and inversion is obtained, and then optimized by repeated iterations; an optimal sequence is further generated to perform subblock rotation and inversion; and the PAPR of a signal is reduced. If a threshold of the PAPR is preset for the system, the computation complexity can be further reduced.

Description

technical field [0001] The present invention relates to the technical field of signal improvement in a multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) broadband wireless communication system, in particular to a method for reducing STBC MIMO- OFDM system peak-to-average ratio. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM), as an efficient multi-carrier modulation scheme, is considered to be an important technology for high-speed data transmission in wireless time-varying channels. In addition, multiple-input multiple-output (MIMO) is another attractive technology. By configuring multiple antennas on both sides of the transceiver, the channel transmission rate can be increased and a large space diversity gain can be obtained, thereby improving system capacity and performance. Combining MIMO and OFDM makes the advantages of these two technologies complement each other, thus having many advantages such as e...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 罗仁泽牛娜
Owner SOUTHWEST PETROLEUM UNIV
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