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Channel estimation method and system based on next generation of wireless waveform FBMC-OQAM

A channel estimation, next-generation technology, applied in baseband systems, channel estimation, baseband system components, etc., can solve the problems of limited signal energy, influence of channel estimation accuracy, energy consumption, etc., and achieve good performance and channel estimation accuracy. , the effect of improving the accuracy of channel estimation

Inactive Publication Date: 2019-03-08
WUHAN POST & TELECOMM RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) Higher side lobes will seriously affect the spectrum sensing accuracy and efficiency of the system, because the energy of the side lobes is too large. Therefore, when sensing according to the traditional energy sensing method, it is impossible to judge whether the detected signal is a useful signal or Side lobes, which will cause a series of consequences such as misjudgment;
[0007] (2) Generally speaking, the energy of the signal sent in the communication system is limited, and the higher side lobe will occupy the energy of the main signal, resulting in energy consumption and waste;
[0008] (3) If the OFDM signal sidelobe is too large, the guard interval of adjacent subcarriers will become longer, which will reduce the spectrum utilization rate and user density of the system;
[0010] (5) Each subcarrier must have the same bandwidth, and each subcarrier must be synchronized and orthogonal, which limits the flexibility of spectrum use
[0015] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: in the traditional CP-OFDM system, because the length of the CP is greater than the maximum multipath delay spread, the frequency selective fading channel becomes independent noise distribution parallel flat fading channel
[0017] It can be seen that due to the existence of imaginary interference items, the traditional OFDM channel estimation algorithm is no longer applicable to the FBMC system, and the accuracy of channel estimation is affected. Therefore, the key to the channel estimation algorithm in the FBMC-OQAM system is how to eliminate the imaginary interference items Or use the imaginary interference term for channel estimation to improve the channel estimation accuracy of FBMC-OQAM

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  • Channel estimation method and system based on next generation of wireless waveform FBMC-OQAM
  • Channel estimation method and system based on next generation of wireless waveform FBMC-OQAM
  • Channel estimation method and system based on next generation of wireless waveform FBMC-OQAM

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Embodiment 1

[0049] Embodiments of the present invention provide a channel estimation method based on next-generation wireless waveform FBMC-OQAM, comprising the following steps:

[0050] The inherent imaginary number interference is used to enhance the pseudo-pilot energy at the receiving end and improve the channel estimation accuracy of FBMC-OQAM.

[0051] The method specifically includes the following steps:

[0052] At the sending end, the guard symbols on the left side of the pilot symbols are replaced with data symbols, the data symbols are buffered and the subcarrier numbers are converted into opposite numbers, and placed on the right side of the pilot symbols to obtain the pseudo pilot frequency data to eliminate the imaginary interference on the left and right sides of the pilot symbols.

[0053] see figure 1 As shown, the format of the pseudo-pilot data is:

[0054] The arrangement law of the data on the left and right sides of the pilot symbol is:

[0055] When the subcarri...

Embodiment 2

[0064] The embodiment of the present invention provides a channel estimation system based on the next-generation wireless waveform FBMC-OQAM, including a transmitting end and a receiving end. The system uses inherent imaginary number interference to enhance the pseudo-pilot energy of the receiving end and improve the channel estimation accuracy of FBMC-OQAM. .

[0065] Specifically, the sender replaces the guard symbols on the left side of the pilot symbols with data symbols, buffers the data symbols and transforms the data whose subcarrier numbers are even numbers into opposite numbers, and places them on the right side of the pilot symbols, obtaining Pseudo-pilot data, eliminating imaginary interference on the left and right sides of the pilot symbol.

[0066] see figure 1 As shown, the format of the pseudo-pilot data is:

[0067] The arrangement law of the data on the left and right sides of the pilot symbol is:

[0068] When the subcarrier number is even, the data on th...

Embodiment 3

[0076] The embodiment of the present invention proposes a high-efficiency spectrum block pilot estimation algorithm, and designs an IAM-EP algorithm. The embodiment of the present invention uses the inherent imaginary number interference to enhance the pseudo-pilot energy at the receiving end to improve the channel estimation accuracy of FBMC-OQAM , while the performance is similar to algorithms such as traditional IAM.

[0077] In the traditional IAM algorithm, only the middle column of pilot symbols can be used to estimate the frequency response of the channel, and the left and right columns of pilot symbols are only used to calculate the inherent imaginary part interference of the middle pilot symbols, and cannot Used to calculate the channel frequency response for the symbol position it is in. In the embodiment of the present invention, the accuracy of wireless channel estimation is improved by using the left and right columns of pilot symbol information set to zero.

[0...

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Abstract

The invention discloses a channel estimation method and system based on next generation of wireless waveform FBMC-OQAM, relating to the technical field of next generation of mobile communication. Themethod comprises the following steps of enhancing pseudo pilot energy of a receiving end by using inherent imaginary interference so as to make FBMC-OQAM channel estimation more accurate. The method effectively improves FBMC-OQAM channel estimation accuracy.

Description

technical field [0001] The invention relates to the technical field of next-generation mobile communication, in particular to a channel estimation method and system based on the next-generation wireless waveform FBMC-OQAM. Background technique [0002] In the 4G era, the basic waveform technology of the wireless physical layer uses CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing with cyclic prefix) technology. However, OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) brings many shortcomings. [0003] For example, the filtering method of the OFDM system is rectangular window filtering, and a CP (Cyclic Prefix, cyclic prefix) is inserted into the signal to combat multipath fading, which brings defects such as waste of wireless resources and impaired data transmission speed. [0004] In addition, because the OFDM technology uses a square wave as the basic waveform, the s...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L25/03
CPCH04L25/0224H04L25/024H04L25/03006
Inventor 陈亮张新全何炜
Owner WUHAN POST & TELECOMM RES INST CO LTD