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Downlink channel estimation method of large-scale MIMO communication system based on uplink channel information assistance

A downlink and link channel technology, which is applied in the field of downlink channel estimation in massive MIMO communication systems to achieve the effect of improving performance

Active Publication Date: 2018-09-04
黑龙江鹿蜀科技有限公司
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Problems solved by technology

But one of the main bottlenecks of existing methods is that the corresponding sparse representation optimization problem only utilizes a single observation sample

Method used

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  • Downlink channel estimation method of large-scale MIMO communication system based on uplink channel information assistance
  • Downlink channel estimation method of large-scale MIMO communication system based on uplink channel information assistance
  • Downlink channel estimation method of large-scale MIMO communication system based on uplink channel information assistance

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] Such as figure 1 Shown, method of the present invention comprises the steps:

[0020] (1) The base station adopts a uniform linear array with N antennas, and the mobile user adopts a single antenna. The mobile user sends the pilot signal, and after the base station receives the signal, the uplink channel is estimated by the classical least square method, denoted as and express it in the form of sparse signal recovery: in:

[0021] called the uplink measurement matrix,

[0022]

[0023]

[0024] Indicates an even division The N grid points of

[0025] d n , n=1,2,...,N, indicating the distance between the nth array element and the first array element, Indicates the wavelength of the uplink electromagnetic wave,

[0026] Element β in i represents theta i The angular deviation on

[0027] is the...

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Abstract

The invention discloses a downlink channel estimation method of a large-scale MIMO communication system based on uplink channel information assistance. The method comprises the following steps: step 1: adopting, by a base station, a uniform linear array with N antennas, adopting, by a mobile user, a single antenna, sending, by the mobile user, a pilot signal, and estimating, by the base station, an uplink channel by using a classical least squares method after receiving the signal, and marking the uplink channel as (the formula is described in the specification); step 2: sending, by the base station, a pilot signal matrix X within T moments, and then, marking the signal received by the mobile user as y; step 3: initializing relevant variables l, w, (the formula is described in the specification), alpha and (the formula is described in the specification); step 4: updating alpha, (the formula is described in the specification), gamma and tau; step 5: updating beta; step 6: judging whether an iteration count variable l reaches an upper limit L or whether gamma converges, if both conditions are not met, making the iteration count variable l=l+1, and returning to step 3; step 7: settinga threshold eta, and selecting an effective angle set omega of a downlink channel by using the threshold; and step 8: estimating a final downlink channel (the formula is described in the specification) by using the effective angle set omega.

Description

technical field [0001] The invention belongs to the field of wireless communication, and relates to a channel estimation method of a multi-input multi-output (MIMO) communication system, in particular to a large-scale MIMO communication system assisted by uplink channel information downlink channel estimation method. Background technique [0002] The multiple-input multiple-output (Multi-input Multi-output, MIMO) technology has become one of the core technologies of the future communication system, and will also be one of the core technologies adopted by the wireless local area network standard. The massive MIMO communication system refers to the concentrated placement of dozens or even hundreds of antennas in a large-scale array within the coverage area of ​​the base station. With hundreds of antenna elements, the massive MIMO system has a high degree of spatial freedom, and beamforming technology can be used to concentrate energy in a smaller area, greatly increasing the ...

Claims

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Application Information

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IPC IPC(8): H04B7/0413H04L25/02
Inventor 戴继生邹航张文策鲍煦
Owner 黑龙江鹿蜀科技有限公司
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