A detection method for mimo-ofdm system based on carrier index modulation
A MIMO-OFDM, carrier index modulation technology, applied in the modulation carrier system, transmission system, multi-frequency code system, etc., can solve the problems of complexity increase, ML detection algorithm complexity limit application, etc., to achieve the effect of reducing complexity
Inactive Publication Date: 2020-01-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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The ML detection algorithm in the MIMO-SIM-OFDM system needs to jointly search the index space and the symbol space. It is a joint detection algorithm with the best bit error rate performance, but the algorithm needs to exhaustively search each combination space, which is complicated. The degree increases exponentially with the number of combinations, modulation order and number of antennas
The extremely high complexity of ML detection algorithms limits its application in practical communication systems
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[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings.
[0035] In this embodiment, the Matlab2012a simulation platform is used for experiments. The experimental simulation parameters are set as follows: 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 channels. The present invention uses the above-mentioned parameters to perform experimental simulation on Matlab. The algorithm has excellent comprehensive performance: under QPSK modulation, the threshold V th =N r Lσ 2 , When the system BER performance is 10 -5 When, bit signal-to-noise ratio E b / N 0 The loss is about 0.7dB, and simulation statistics show that the complexity is reduced by about 90% relative to ML detection. The present invention p...
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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 of a MIMO-OFDM system based on carrier index modulation for the MIMO-SIM-OFDM system, and its main idea is: (1) at the receiving end, perform MMSE detection on the received symbol vector corresponding to each subcarrier , and make a hard decision on the detected symbol; (2) traverse all the index combinations, take out the hard decision symbol corresponding to the index position in the index combination to obtain the transmitted symbol vector, multiply it by the corresponding channel matrix, and calculate the Euclidean value of the received symbol vector (3) Sort the Euclidean distances of the transmitted symbol vectors corresponding to all index combinations, the smaller the Euclidean distance, the higher the reliability; (4) Introduce a threshold value, if the minimum value of the Euclidean distance satisfies the threshold value, then directly output the corresponding index combination and modulation symbol; otherwise, ML detection is performed at the end.
Description
Technical field [0001] The present invention belongs to the field of wireless communication technology, 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 technology. Background technique [0002] The proposal of the MIMO-OFDM system is a major breakthrough in the field of wireless mobile communications. The system combines the advantages of MIMO technology and OFDM technology, can effectively resist multipath fading and frequency selective fading, and has outstanding advantages such as large channel capacity and high transmission rate. It is one of the key technologies of the physical layer of the future wireless mobile communication system. [0003] In recent years, Subcarrier Index Modulation (SIM) has been proposed as a new type of modulation tec...
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IPC IPC(8): H04B7/0413H04B7/08H04L27/26
CPCH04B7/0413H04B7/0854H04L27/2628H04L27/265H04L27/2697
Inventor 董方维肖悦雷霞李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA