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Method for suppressing peak-to-average power ratio of subcarrier modulation OFDM system

A peak-to-average ratio suppression, carrier modulation technology, applied in modulated carrier systems, transmission systems, multi-frequency code systems, etc., can solve the problems of poor PAPR suppression performance and high PAPR in SIM-OFDM systems

Inactive Publication Date: 2016-10-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0005] However, the PAPR of the SIM-OFDM system is still high and needs to be further reduced
We know that the constellation expansion method can reduce the PAPR without losing the BER performance of the system. The disadvantage is that the transmit power is increased, and the PAPR suppression performance is worse as the modulation order increases.

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  • Method for suppressing peak-to-average power ratio of subcarrier modulation OFDM system
  • Method for suppressing peak-to-average power ratio of subcarrier modulation OFDM system
  • Method for suppressing peak-to-average power ratio of subcarrier modulation OFDM system

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Embodiment Construction

[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0049] figure 1 It is a block diagram of a traditional SIM-OFDM system. The left QAMsymbol2 and QAMsymbol1 of the traditional carrier index modulation in the figure are the OFDM data symbols to be mapped, and the 0 and 1 on the right are index bits. The first sub-fast index bit is 0, and the first The next carrier of the sub-fast, namely figure 1 Subcarrier 3 on the right is put into QAMsymbol 2, and the second index bit is 1, then the previous carrier of the second sub-block is activated, that is, Subcarrier 2 is put into QAMsymbol 1, and the others are inactive empty carriers.

[0050] In this embodiment, the Matlab2012a simulation platform is used for experiments. The experimental simulation parameters are as follows: the number of subcarriers N=256, l=2, k=1, the clipping threshold A=4.68dB, the maximum number of iterations Max_iter=3, the iterative PAP...

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Abstract

The present invention relates to the technical field of wireless communications, and particularly to a method for reducing the PAPR in a subcarrier index modulation orthogonal frequency division multiplexing system. In the method of the present invention, amplitude limiting processing is performed on a modulated signal first, so that cancelled amplitude limiting noise is obtained, and amplitude limiting noise is obtained finally. Compared with the conventional constellation extension method, the method of the present invention can extend constellation points to a greater extent, thereby significantly improving the PAPR suppression performance and having good BER performance.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a method for reducing PAPR in a Subcarrier Index Modulation Orthogonal Frequency Division Multiplexing (Subcarrier Index Modulation Orthogonal Frequency Division Multiplexing, SIM-OFDM) system. Background technique [0002] As a multi-carrier modulation method, the OFDM system converts high-speed data streams into several parallel low-speed data streams through serial / parallel conversion, and maps them to different subcarriers of OFDM symbols for transmission. Since OFDM modulation and demodulation can be implemented with FFT and IFFT, OFDM, as one of the key technologies, is widely used in the evolution of B3G / 4G. [0003] However, while the OFDM system improves the system performance, it also has several important defects, such as being very sensitive to the influence of frequency offset and phase noise, and the performance is extremely deteriorated i...

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2614
Inventor 但黎琳郭万曹马千里张弛恆欧阳昊
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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