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Method for modulating multi-antenna OFDM (Orthogonal Frequency Division Multiplexing) index

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

Active Publication Date: 2019-03-01
XIDIAN UNIV
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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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  • Method for modulating multi-antenna OFDM (Orthogonal Frequency Division Multiplexing) index
  • Method for modulating multi-antenna OFDM (Orthogonal Frequency Division Multiplexing) index
  • Method for modulating multi-antenna OFDM (Orthogonal Frequency Division Multiplexing) index

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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 multiple-input multiple-output orthogonal frequency division multiplexing MIMO-OFDM system has a size of N t ×N matrix b...

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Abstract

The invention discloses a method for modulating multi-antenna OFDM index, mainly solves the problems that the prior technology has a low performance of the bit error ratio and a high complexity of theimplementation scheme. The method comprises the steps of 1) designing an index modulation frequency domain signal of the multi-antenna OFDM to acquire a frequency domain signal, 2) performing the orthogonal frequency division multiplexing OFDM index modulation to the frequency domain signal to acquire a modulation signal, 3) transmitting the modulation signal in a channel to acquire a receiving signal, 4) performing the orthogonal frequency division multiplexing OFDM demodulation to the receiving signal by a receiving end to acquire a demodulation signal, 5) detecting the demodulation signalby the receiving end to acquire an estimation signal, and 6) inversely mapping the estimation signal into bit information to finish the signal transmission process. The method provided by the invention has the advantages of low bit error ratio, simple implementation and high transmission speed of the system information, is useful for improving the performance of the bit error ratio of the wirelesscommunication system, and realizes the 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....

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Application Information

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IPC IPC(8): H04B7/0413H04L27/26
CPCH04B7/0413H04L27/2601H04L27/2627H04L27/2628H04L27/2649H04L27/265
Inventor 郑贱平陈茹
Owner XIDIAN UNIV