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Channel state information reporting with basis expansion for advanced wireless communications systems

A reporting and base station technology, applied in radio transmission systems, diversity/multi-antenna systems, transmission systems, etc., can solve problems such as not being able to fully adapt to channel state information

Inactive Publication Date: 2016-03-16
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Existing channel quality reporting procedures in wireless communication systems cannot adequately accommodate the reporting of channel state information associated with large two-dimensional arrays of transmit antennas

Method used

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  • Channel state information reporting with basis expansion for advanced wireless communications systems
  • Channel state information reporting with basis expansion for advanced wireless communications systems
  • Channel state information reporting with basis expansion for advanced wireless communications systems

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] For a typical 2D dual-polarization array with sufficiently small inter-element spacing (see Figure 3A ), for each polarization (+45° or -45°), the term A(φ k ,θ l ) can be written as the following (see Figure 3B and Figure 3C ):

[0109] A ( φ k , θ l ) = 1 N r N c 1 ...

Embodiment 2

[0116] Note that (1) and (2) facilitate (or at least encourage) linear discretization in the AoD domain. Alternatively, the MIMO channel can also be expressed as a linear combination of basis functions / vectors in the discrete Fourier transform (discreteFouriertransform, DFT) phase domain. That is:

[0117] H ( q , f ) ≅ Σ k = k 0 k 0 + K - 1 Σ l = l 0 l 0 + L - 1 c ...

Embodiment 3

[0135] Starting from Embodiment 1 or 2, if the channel representation in (1) / (1b) or (5) is applied to the channel feature vector instead of the channel itself, another level of dimensionality reduction can be achieved. Using (1b) to exemplify the method (one skilled in the art will easily extend it to use (1) or (5)), the procedure is as follows:

[0136] • Perform eigendecomposition or singular value decomposition on the DLMIMO channel for each polarization and frequency sub-band. Here, channels associated with different receive antennas are concatenated into a channel matrix.

[0137] Based on the selected RI (eg, N=1 or 2), the UE selects N dominant (strongest) eigenvectors (or right singular vectors), and the corresponding eigenvalues ​​are among the N Reflected / captured in the CQI value.

[0138] • Since the UE is located within one or a few small pyramids, each of the N eigenvectors (for each polarization and frequency sub-band) allows the following approximation (see...

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Abstract

Scalable channel state information feedback for FD-MIMO involves quantizing the downlink channel according to a finite set of basis vectors to reduce the number of coefficients quantized and reported from user equipment to a base station. The procedure includes measurement at the base station of angle of arrival spread for uplink signal reception from the user equipment and signaling that spread to the user equipment. The user equipment then quantizes the MIMO channel according to a sub-scheme configured based upon the signaled spread and reports (feeds back) the quantized channel to the base station.

Description

technical field [0001] The present disclosure relates generally to reporting channel state information in a wireless communication system, and more particularly to reporting channel state information associated with a two-dimensional array of transmit antennas. Such two-dimensional arrays are associated with a class of MIMO systems commonly referred to as "full-dimension" multiple-input-multiple-output (FD-MIMO). Background technique [0002] Existing channel quality reporting procedures in wireless communication systems cannot adequately accommodate the reporting of channel state information associated with large two-dimensional arrays of transmit antennas. [0003] Therefore, there is a need in the related art to improve channel quality reporting in wireless communication systems. Contents of the invention [0004] The present disclosure relates to scalable channel state feedback for FD-MIMO involves quantizing the downlink channel according to a limited set of basis ve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04L1/00
CPCH04B7/0626H04L1/0026H04B7/0478H04B7/0486H04B7/0639H04B7/0479
Inventor E.翁戈萨努西李旸南映瀚M.S.拉曼
Owner SAMSUNG ELECTRONICS CO LTD
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