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Parameter estimation method for time-varying channel

A technology of parameter estimation and time-varying channel, which is applied in channel estimation, propagation channel monitoring, transmission monitoring, etc., and can solve the problems of OFDM system performance degradation, destruction of orthogonality between subcarriers, and increase of Doppler frequency shift, etc.

Active Publication Date: 2019-03-22
HANGZHOU DIANZI UNIV
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Problems solved by technology

At the same time, in a fast time-varying environment, the Doppler frequency shift increases, which destroys the orthogonality between subcarriers and causes Inter-Carrier Interference (ICI), which deteriorates the performance of the OFDM system and reduces the channel estimation performance. precision

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  • Parameter estimation method for time-varying channel
  • Parameter estimation method for time-varying channel
  • Parameter estimation method for time-varying channel

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Embodiment Construction

[0060] specific implementation plan

[0061] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0062] Step 1: The receiving end collects the signals received on the multi-antennas arranged in UCA (Uniform Circle Array), and the received signals can be expressed as

[0063]

[0064] In the formula, α l is the scattering coefficient of the lth diameter, a l is the receiving array response matrix of the lth path, f d is the Doppler frequency, T s is the sample period, θ l is the angle between the incident direction of the received signal and the horizontal direction, Send the signal for the time domain, d l is the correlation time delay of the lth path, and z(n) is Gaussian white noise.

[0065] Step 2: Construct the orthogonal subspace projection matrix, first define the spatial filter matrix,

[0066]

[0067] In the formula, β k is the average angle of the kth orthogonal subspac...

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Abstract

The invention provides a parameter estimation method for a time-varying channel. The parameter estimation method comprises the following steps: firstly, a receiving terminal acquires a signal receivedon multiple antennae; secondly, constructing an orthogonal subspace projection matrix; thirdly, projecting the received signal onto subspaces which are mutually orthogonal by utilizing the orthogonalsubspace projection matrix; fourthly, performing channel estimation in each orthogonal subspace, so that a channel estimation parameter in each orthogonal subspace is obtained; fifthly, performing Doppler compensation on a channel impulse response estimated value in each orthogonal subspace; and sixthly, combining the channel impulse response estimated values in the orthogonal subspaces, so thata final channel estimation result is obtained. The time-varying channel estimation method based on orthogonal subspace projection can obtain a smaller channel estimation mean square error, and performance is improved.

Description

technical field [0001] The invention belongs to the field of receiving in a multi-antenna environment, and in particular relates to a time-varying channel parameter estimation method based on orthogonal subspace projection. Background technique [0002] With the development of high-speed railways, people travel more and more conveniently. At present, one of the railway construction goals is that more than 80% of the big cities can be covered by the high-speed railway network, and the travel time between Beijing and most provincial capital cities should be controlled within 2-8 hours. This also means that in this fast-paced society, people will be more willing to choose high-speed rail for travel. However, as China enters the 4G era, railway users' demand for communication is increasing day by day. The narrowband communication system GSM-R (GSM for Railways) used by high-speed railways can no longer meet users' broadband communication needs, such as video calls, conference ...

Claims

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Application Information

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IPC IPC(8): H04B17/30H04B17/382H04L25/02
CPCH04L25/0202H04B17/30H04B17/382
Inventor 曾嵘黄强
Owner HANGZHOU DIANZI UNIV
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