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Detection method of mimo-ofdm system based on carrier index modulation

A technology of MIMO-OFDM and carrier index modulation, applied in the direction of modulated carrier system, transmission system, multi-frequency code system, etc., can solve the problems of increasing complexity and limiting the application of ML algorithm, and achieve the effect of reducing complexity

Active Publication Date: 2019-08-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Description
  • Claims
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Problems solved by technology

The ML detection algorithm is a joint detection algorithm. The advantage is that the detection performance is optimal. The disadvantage is that the complexity increases exponentially with the number of combinations, modulation orders, and antennas. Therefore, the extremely high complexity limits the application of ML algorithms in actual communication systems. application in

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  • Detection method of mimo-ofdm system based on carrier index modulation
  • Detection method of mimo-ofdm system based on carrier index modulation
  • Detection method of mimo-ofdm system based on carrier index modulation

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Embodiment Construction

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037] In this embodiment, the Matlab2012a simulation platform is used for experiments. The experimental simulation parameters are set as follows: the number of transmitting antennas N t =2, the number of receiving antennas N r =2, the total number of subcarriers N=512, the subcarrier configuration is L=2, K=1, the signal modulation is QPSK, and the channel in the simulation is Rayleigh fading and Gaussian white noise channel. The present invention utilizes above-mentioned parameters to carry out experimental simulation on Matlab, and this algorithm has more excellent comprehensive performance: under QPSK modulation, threshold value V th =N r Lσ 2 , when the system BER performance is 10 -4 , the bit signal-to-noise ratio E b / N 0 The loss is about 0.8dB, and the complexity is reduced by about 80% relative to ML detection. The invention proposes a new ...

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Abstract

The invention belongs to the technical field of wireless communication, and relates to Multiple Input Multiple Output (Multiple-Input Multiple-Output, MIMO), Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) and Carrier Index Modulation (Subcarrier Index Modulation, SIM) technologies and related signal detection techniques. The present invention proposes a detection method for a MIMO-OFDM system based on carrier index modulation. The main idea is: (1) calculate the pseudo-inverse for each column of the channel matrix corresponding to the subcarrier block, and multiply it with the received symbol vector to obtain Detect symbols; (2) Introduce a criterion to calculate the reliability of each antenna combination, that is, sum the squares of the detection symbols corresponding to each antenna combination, and sort them. The larger the sum value is, the more reliable the antenna combination is. (3) Prioritize MMSE equalization and hard decision for combinations with high reliability; (4) If the obtained hard decision symbol satisfies a certain decision criterion, then directly output the symbol and index position information, otherwise the next Combinations are processed in the same way; (5) If all combinations do not meet the requirements, ML detection is performed.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to multiple-input multiple-output (Multiple-Input Multiple-Output, MIMO), orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) and carrier index modulation (Subcarrier Index Modulation, SIM) technologies and related signal detection techniques. Background technique [0002] MIMO technology has a long history. It was first proposed by Marconi in 1908. It refers to the use of multiple transmitting antennas and receiving antennas at the transmitting end and receiving end respectively, so that signals are transmitted and received through multiple antennas at the transmitting end and receiving end, thus Improve communication quality. It can make full use of space resources, realize multiple transmissions and multiple receptions through multiple antennas, and can double the system channel capacity without increasing spectrum resources...

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Application Information

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IPC IPC(8): H04L27/26H04B7/0413H04B7/08
CPCH04B7/0413H04B7/0854H04L27/2628H04L27/265H04L27/2697
Inventor 肖悦董方维徐斌雷霞李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA