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Real-number feedback iteration channel estimation method based on MIMO-FBMC (Filterbank Multicarrier) system

A channel estimation and real number technology, applied in channel estimation, baseband system, baseband system components, etc., can solve the problems of minimizing overhead, double interference of system and channel, weakening system interference, etc., to improve the accuracy rate, The effect of low pilot overhead

Active Publication Date: 2019-03-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, CTSD still uses a complex ZCZ sequence. The real and imaginary parts are sent separately and separated by zero interpolation in the middle. The overhead is not minimized and the real and imaginary parts are sent separately, which will suffer double interference from the system and channel.
Moreover, the above methods all start from the pilot structure to weaken the system interference

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  • Real-number feedback iteration channel estimation method based on MIMO-FBMC (Filterbank Multicarrier) system
  • Real-number feedback iteration channel estimation method based on MIMO-FBMC (Filterbank Multicarrier) system
  • Real-number feedback iteration channel estimation method based on MIMO-FBMC (Filterbank Multicarrier) system

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[0033] The present invention will be described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention.

[0034] The signal processing flow of each antenna in the MIMO-FBMC system is as follows: figure 1 As shown, the pilot structure of the sending end is as follows figure 2 , the overall processing flow of the present invention is:

[0035] At the sending end, the binary data stream is QAM-modulated to the corresponding time-frequency grid point first, and several sets of independent data streams are formed after serial-to-parallel conversion, and pilots are added to the first column of data symbols of each antenna, according to the above method form a N T ×M sequence set, each i row of the sequence set is used as the pilot frequency of the i-th antenna. After the pilot is added, divide the data symbol into real part and imaginary part and then perform IFFT operation after different phase ...

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Abstract

The invention belongs to the field of communication technology, and relates to a real-number feedback iteration channel estimation method based on an MIMO-FBMC system. According to the method, a fully-real orthogonal sequence in a frequency domain is used to replace an original complex-number pilot symbol on the basis of the FBMC system based on interleaved orthogonal modulation, a corresponding number of orthogonal sequences of a real-number domain are generated according to the number of antennas, and are used for channel estimation on the different antennas, and through improving a receiverstructure, feedback iteration is added between FBMC demodulation and channel estimation to further eliminate system interference. Therefore, contribution of the invention is that the fully-real orthogonal sequence which is of the frequency domain, occupies only one FBMC symbol and meets the ZCZ (Zero Correlation Zone) characteristics is constructed, pilot overheads are minimized, a cyclic feedback iteration structure is introduced to further eliminate the system interference, and thus more accurate channel estimation values are obtained.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to a real number feedback iterative channel estimation method based on MIMO-FBMC system. Background technique [0002] The filter bank multicarrier (Filterbank Multicarrier, FBMC) system has a great breakthrough in solving the spectrum efficiency problem of the OFDM technology, because the FBMC does not need to use a cyclic prefix (Cyclic Prefix, CP). FBMC makes the signal completely orthogonal along the frequency axis through the isotropic orthogonal transformation function (IOTA), so the FBMC system based on the IOTA function has good time-frequency focusing characteristics, and can effectively suppress the intersymbol interference (Intersymbol Interference) caused by the wireless channel. Symbol Interference, ISI) and Inter Carrier Interference (Inter Carrier Interference, ICI). Each FBMC system is equipped with a properly designed pulse shaping filter, which has good time-f...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0413H04L25/02
CPCH04B7/0413H04L25/0204H04L25/0224
Inventor 胡苏张静
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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