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Multi-antenna ofdm exponential modulation method

A modulation method and multi-antenna technology, applied in the field of communication, can solve problems such as poor bit error performance, waste of antenna resources, and high implementation complexity, and achieve the effect of low bit error performance and reduced complexity

Active Publication Date: 2021-04-06
XIDIAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

In this structure, N t Only n in the root transmit antenna t The root antenna is activated, so there is a waste of antenna resources. Compared with the MIMO-OFDM-IM structure, the GSFIM structure has worse bit error performance and higher implementation complexity

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  • Multi-antenna ofdm exponential modulation method
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  • Multi-antenna ofdm exponential modulation method

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] On the basis of MIMO-OFDM structure with MIMO-OFDM structure, the present invention adopts a unique frequency domain position activation design scheme, and utilizes two smaller position activation vectors K 1 with K 2 Do Kronecker product to generate position activation matrix I, instead of the traditional method of selecting the position of activated subcarriers from a large matrix, so as to reduce the complexity of implementation. In addition, since the antenna activation positions are random in different sub-matrix blocks, there is no waste of antenna resources, so compared with the prior art, the present invention can improve the bit error performance of the wireless communication system and reduce implementation complexity.

[0031] The MIMO-OFDM system with MIMO-OFDM has a size of N t ×N matrix blocks, where N t Indicates the number of rows of transmitt...

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Abstract

The invention discloses a multi-antenna OFDM index modulation method, which mainly solves the problems of low bit error performance and high implementation complexity in the prior art. The implementation scheme is: 1) carry out the multi-antenna OFDM exponential modulation frequency domain signal design to obtain the frequency domain signal; 2) perform OFDM index modulation on the frequency domain signal to obtain the modulated signal; 3) convert the modulated signal Transmit in the channel to obtain the received signal; 4) The receiving end performs OFDM demodulation on the received signal to obtain the demodulated signal; 5) The receiving end detects the demodulated signal to obtain the estimated signal; 6) The The estimated signal is reverse-mapped into bit information to complete the signal transmission process. The invention has the advantages of low bit error rate, simple implementation and high system information transmission rate, and can be used to improve the bit error performance of a wireless communication system and realize reliable transmission.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to an index modulation method, which can be used in a multi-antenna Orthogonal Frequency Division Multiplexing (OFDM) system, improves its code error performance, reduces implementation complexity, and the like. Background technique [0002] OFDM is a multi-carrier modulation method widely used in the field of wireless communication, which can effectively overcome multipath fading. In 2015, proposed a multi-antenna OFDM based on index modulation in "Multiple-input multiple-output OFDM with indexmodulation" (IEEE Signal Processing Letters, vol.22, no.12, pp.2259-2263, Dec.2015) structure, called MIMO-OFDM-IM. The structure adopts an independent OFDM index modulation method on each transmitting antenna, and not only transmits bit information through signal constellation points, but also transmits bit information by selecting the positions of activated subcarriers....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04B7/0413H04L27/2601H04L27/2627H04L27/2628H04L27/2649H04L27/265
Inventor 郑贱平陈茹
Owner XIDIAN UNIV