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Angle domain channel estimation method based on flexible codebook configuration for millimeter wave system

A channel estimation and angle domain technology, applied in the field of 5G communication, can solve problems such as low instantaneous signal-to-noise ratio at the receiving end, difficulty in estimating channel state information, large path loss of high-frequency signals, etc., and achieve the effect of reducing complexity

Inactive Publication Date: 2018-06-01
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, when there is no beamforming, due to the large path loss of high-frequency signals, the instantaneous signal-to-noise ratio at the receiving end is very low, so it is very difficult to accurately estimate channel state information in hybrid mmWave massive MIMO systems

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  • Angle domain channel estimation method based on flexible codebook configuration for millimeter wave system
  • Angle domain channel estimation method based on flexible codebook configuration for millimeter wave system
  • Angle domain channel estimation method based on flexible codebook configuration for millimeter wave system

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[0045] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0046] The present invention will be further described below in conjunction with the accompanying drawings.

[0047] A channel estimation algorithm based on multi-layer flexible codebook configuration codebook, which is used for channel estimation and precoding design of downlink channel, such as figure 1 shown, including the following steps:

[0048] Step A. Select the appropriate channel precoding codebook size to be N, then the angular domain resolution of the channel is π / N, and adopt the dichotomy method to carry out the layering of the precoding codebook, then the total number of layers of the codebook is S=log 2 (N), at layer s, contains 2 s-1 Each subset has two beamforming vectors with a certain width to generate the corresponding training sequence. Each beamforming vector is subdivided into two narrower beamforming vectors in the next ...

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Abstract

The invention discloses an angle domain channel estimation method based on flexible codebook configuration for a millimeter wave system. A pre-coded codebook of a corresponding angle is generated before implementation of channel estimation by an adjustable compressed sensing technology, and then a codebook space is traversed to perform beamforming matching, so that a matching operation of optimalprecoding is completed at the end of the channel estimation. The performance of the estimation algorithm depends on the size of the codebook space. Specific to the characteristic, a progressive resolution matching pursuit algorithm is proposed, so that an accuracy-configurable pre-coded codebook vector space can be generated synchronously. Through adoption of the method, the computational complexity of a channel estimation algorithm is lowered effectively without loss of channel estimation performance, so that the method can be effectively applied to angle domain channel estimation of an actual millimeter wave large-scale MIMO (Multiple Input Multiple Output) system.

Description

technical field [0001] The invention relates to a millimeter wave system angle domain channel estimation method with flexible codebook configuration, belonging to the technical field of 5G communication. Background technique [0002] Millimeter-wave massive MIMO systems are widely considered to be a key technology with potential in future 5G systems. In order to reduce the cost of hardware and the loss of circuit energy, in the actual communication system, it is proposed to use hundreds of antennas and a small number of radio frequency chains at the base station and user end, and to use hybrid beamforming technology to solve this difficulty. This approach is called a hybrid precoded mmWave massive MIMO system. Hybrid beamforming technology is different from traditional beamforming technology, which includes radio frequency beamforming technology and baseband beamforming technology. In order to simultaneously design beamforming vectors for both radio frequency and baseband,...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0456H04L25/02
CPCH04B7/0456H04L25/0202
Inventor 王志旭王鸿宋荣方
Owner NANJING UNIV OF POSTS & TELECOMM
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