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Low-dimensional subspace OTFS channel estimation method

A channel estimation, orthogonal subspace technology, applied in digital transmission systems, electrical components, modulated carrier systems, etc., can solve problems such as large computational complexity, no reflection of channel response changes, inconsistent communication scenarios, etc., to achieve ECR estimation Accurate, reduced computational complexity effects

Inactive Publication Date: 2021-12-28
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0003] However, the existing OTFS channel estimation scheme is limited to limited-Doppler-shift channel (limited-Doppler-shift channel, LDSC), LDSC lacks the consideration of multipath, and the frequency elements considered are discrete, reflecting the communication scene Inconsistent with reality: In actual communication scenarios, there are a large number of scattering elements and multipath channels, such as outdoor wireless communication networks in cities, and the Doppler frequency of each scattering path is continuous. This type of channel is called continuous Doppler spread channel (continuous-Doppler-spread channel, CDSC)
Moreover, in high-speed mobile scenarios, the channel response may change rapidly within a transmission symbol. Once this change is ignored, serious demodulation errors will occur, but the existing channel estimation methods do not have the ability to reflect the channel response change within a symbol. Ability
Another problem is that if the channel response has a non-negligible rapid change within one transmission symbol, the number of estimation points required for the channel response will be far more than the number of pilots. Under the condition of a limited number of pilots, the channel response The estimation of will become an underdetermined estimation problem with many unknowns, and the calculation of the CDSC channel response will be accompanied by great computational complexity

Method used

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  • Low-dimensional subspace OTFS channel estimation method
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  • Low-dimensional subspace OTFS channel estimation method

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Embodiment

[0085] figure 1 It is a structural block diagram of the OTFS transmission system of the present embodiment. The source end inputs the binary information bit stream to be sent, and the data bits are symbol-mapped and form a two-dimensional data block X∈C with pilot symbols M×N , where M and N represent the time delay and the data resource size in the Doppler domain, respectively. Transform X from the DD domain to the time-frequency (TF) domain using the Sim Fourier transform (ISFFT=), expressed as: D=F M XF N ,FM ∈C M×M and F N ∈C N×N represent the Fourier transform matrix, respectively. Convert the TF data block D to the time domain through FFT (Fast Fourier) to obtain the data block Read the time-domain data block S by column and add the cyclic prefix to send the time-domain data into the channel.

[0086] At the receiving end, after the cyclic prefix is ​​removed, the time domain data is transformed into the TF domain through FFT, and then transformed into the DD dom...

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Abstract

The invention discloses a low-dimensional subspace channel estimation method, and belongs to the technical field of OTFS modulation communication. According to the method, the channel is modeled in the time delay-Doppler domain, and accurate equivalent channel response can be obtained for the continuous Doppler expansion channel. According to the method, an orthogonal DD domain subspace is obtained by selecting a proper time domain primary function and ISFFT, a proper subspace dimension is selected according to a quantized modeling error, a projection coefficient of an equivalent channel response (ECR) in the space is obtained through derivation according to an MMSE criterion in the subspace, and the ECR is reconstructed through the projection coefficient and the DD domain subspace primary function. Compared with the existing method, the method provided by the invention can more accurately estimate the continuous Doppler channel and greatly reduce the calculation complexity.

Description

technical field [0001] The invention belongs to an Orthogonal time frequency space (OTFS) modulation technology in the communication field, and in particular relates to a low-dimensional subspace OTFS channel estimation method. Background technique [0002] Compared with 4G (fourth generation mobile communication technology), the service object of 5G / B5G communication technology is from people to people communication, and the communication between people and things, things and things has been increased, so it needs to meet the needs of very diverse application scenarios. As one of the most challenging communication scenarios, realizing reliable communication in a high-speed mobile environment, such as Internet of Vehicles, high-speed trains, drones, etc., is of great importance for enriching communication systems and realizing a wider Internet of Things. significance. The current modulation method used in 4G and 5G communication systems is Orthogonal Frequency Division Mult...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2695H04L27/2639
Inventor 刘光辉许思扬瞿辉洋徐福琛柏义阳朱树元刘博谦
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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