Channel estimation method based on joint placement of orthogonal time-frequency-space OTFS pilot frequency

A channel estimation and time-frequency technology, applied in the baseband system, baseband system components, transmission system, etc., can solve the problem of high pilot energy demand, achieve the effect of reducing energy demand and improving accuracy

Active Publication Date: 2021-11-05
XIDIAN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art, to provide a channel estimation method based on joint placement of orthogonal time-frequency-space OTFS pilots, aiming to solve the problem of accurately estimating the delay Doppler channel state in OTFS communication systems Problems with information (CSI) and problems with excessive pilot energy requirements

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  • Channel estimation method based on joint placement of orthogonal time-frequency-space OTFS pilot frequency
  • Channel estimation method based on joint placement of orthogonal time-frequency-space OTFS pilot frequency
  • Channel estimation method based on joint placement of orthogonal time-frequency-space OTFS pilot frequency

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] refer to figure 1 , the specific steps for realizing the present invention are described as follows.

[0027] Each frame of data sent at the sending end is shown in step 1:

[0028] Step 1, place the pilot frequency in the orthogonal time-frequency-space OTFS data block according to the following formula:

[0029]

[0030] Wherein, x[k,l] represents the kth data symbol on the lth subcarrier in the orthogonal time-frequency space OTFS data block; k=1,...,M-1 and l=1,..., N-1, M and N respectively represent the total number of subcarriers and the total number of symbols in the OTFS system determined by the number of transmitter antennas, x p Represents the kth in the orthogonal time-frequency space OTFS data block matrix p line l p Column pilot symbols, 0 means the kth in an orthogonal time-frequency space OTFS data block matrix p -k max ...

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Abstract

The invention discloses a channel estimation method based on joint placement of orthogonal time-frequency-space OTFS pilot frequencies. The method comprises the following implementation steps: 1, placing orthogonal time-frequency-space OTFS data block pilot frequencies and guard intervals; 2, carrying out inverse symplectic Fourier transform on the data block, then carrying out Hisenberg transform on the signal block, and sending an obtained time domain signal; 3, receiving, by a receiving end, an orthogonal time-frequency-space OTFS data block signal, and carrying out the threshold detection on the orthogonal time-frequency-space OTFS data block signal; 4, extracting a data block signal of the receiving end exceeding a threshold value, and calculating an antenna channel coefficient. According to the invention, the guard interval is arranged at the position within half of the maximum delay spread and the maximum Doppler spread around the pilot symbol, so that the interference on the pilot symbol of the receiving end is reduced, the accuracy of the estimated channel information is improved, and the energy demand of the pilot is reduced.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a channel estimation method based on jointly placed Orthogonal Time Frequency Space OTFS (Orthogonal Time Frequency Space) pilots in the technical field of wireless communication. The invention can be used to estimate the corresponding channel information from the pilot signal received by the OTFS system. Background technique [0002] At present, the Orthogonal Frequency Division Multiplexing (OFDM) modulation technology widely used in 5G and WIFI wireless networks is susceptible to the Doppler effect. Compared with OFDM, OTFS has better performance in high mobility wireless communication scenarios. Orthogonal time-frequency-space OTFS is a two-dimensional modulation scheme that modulates in the delay-Doppler domain. Through a series of two-dimensional transformations, the dual-dispersion channel is converted into an approximately non-fading channel in the delay-Dopp...

Claims

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Application Information

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IPC IPC(8): H04L25/02
CPCH04L25/0228H04L25/0242Y02D30/70
Inventor 刘伟邹礼一
Owner XIDIAN UNIV
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