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OFDM-IM modulation method for transmission diversity

A technology of OFDM-IM and modulation method, which is applied in the field of OFDM index modulation, can solve the problem of not carrying symbol information, etc., and achieve low bit error rate and reduce bit error effect

Active Publication Date: 2017-02-22
XIDIAN UNIV
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Problems solved by technology

[0005] In the above steps, it can be seen that although n-k subcarriers carry position information, they do not carry symbol information, so OFDM-IM does not use all degrees of freedom to obtain better bit error performance and reliable information transmission

Method used

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  • OFDM-IM modulation method for transmission diversity
  • OFDM-IM modulation method for transmission diversity
  • OFDM-IM modulation method for transmission diversity

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings.

[0036] The present invention uses the idle subcarriers in OFDM-IM on the basis of the traditional OFDM-IM, so that the same bit information is transmitted on both the active subcarrier channel and the idle subcarrier channel, and further through the block interleaving frequency domain signal design scheme The correlation between active sub-carrier channels and idle sub-carrier channels is reduced to obtain transmit diversity gain. In addition, the design of the auxiliary signal constellation diagram on idle subcarriers plays a crucial role. The design principle is that after the auxiliary signal constellation diagram is combined with the traditional signal constellation diagram, the minimum Euclidean distance of the joint signal constellation diagram obtained is the largest change. figure 2 The design schemes of auxiliary signal constellation diagrams under different...

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Abstract

The invention discloses an OFDM-IM modulation method for transmission diversity, and mainly solves the problem that the bit-error performance is low in the prior art. The technical scheme comprises the following steps of: (1), performing OFDM-IM frequency-domain signal design of the transmission diversity, so that a frequency-domain signal is obtained; (2), performing OFDM modulation and block interleaving of the frequency-domain signal, so that a modulated signal is obtained; (3), transmitting the modulated signal in a channel, so that a received signal is obtained; (4), performing OFDM demodulation and de-interleaving of the received signal by a receiving end, so that a demodulated signal is obtained; (5), detecting the demodulated signal by the receiving end, so that an estimated signal is obtained; and (6), inversely mapping the estimated signal into bit information, so that a signal transmission process is completed. By means of the OFDM-IM modulation method disclosed by the invention, the transmission diversity gain can be obtained; compared with the traditional OFDM-IM, the OFDM-IM modulation method has relatively high anti-fading capability and better bit-error performance, and can be used for improving the error code performance of a wireless communication system; and thus, reliable transmission is realized.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to an orthogonal frequency division multiplexing OFDM index modulation method, which can improve the bit error performance of a wireless communication system and realize reliable transmission. Background technique [0002] OFDM is a multi-carrier modulation method widely used in wireless communication, which can effectively overcome multipath fading. In 2013, proposed an OFDM structure based on index modulation, called OFDM-IM, in the article "Orthogonal Frequency Division Multiplexing With Index Modulation" (IEEE Transaction on Signal Processing, Volume: 61, No. 22, November 15, 2013). Different from the traditional OFDM structure, OFDM-IM not only transmits information bits through signal constellation points, but also transmits information bits by selecting the activation positions of orthogonal subcarriers. The specific implementation steps are as follows: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04L27/26H04L1/00
CPCH04L1/0071H04L5/0098H04L27/2601H04L27/261H04L27/2627
Inventor 郑贱平陈茹
Owner XIDIAN UNIV
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