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Multi-cell downlink MIMO (multiple input multiple output) robust beam-forming method based on QoS (quality of service)

A beamforming and multi-cell technology, applied in diversity/multi-antenna systems, advanced technology, climate sustainability, etc., can solve problems such as high computational complexity

Active Publication Date: 2015-06-24
北京中网华通设计咨询有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

For the multi-cell downlink MIMO beamforming under this improved design, some researchers have proposed a standard power allocation algorithm based on the uplink and downlink duality, but it is only applicable to the ideal CSI channel environment
In addition, in the non-ideal CSI environment, the researchers proposed to use Semi Definite Programming (Semi Definite Programming, SDP) and Second-Order Cone Programming (Second-Order Cone Programming, SOCP) toolkit to solve the multi-cell downlink MIMO beam under this improved design. Forming, but directly using the solution method of the convex optimization toolkit to optimize the mutual coupling between variables, the computational complexity is extremely high

Method used

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Embodiment Construction

[0100] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0101] In describing the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than Nothing indicating or implying that a referenced device or elem...

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Abstract

The invention provides a multi-cell downlink MIMO (multiple input multiple output) robust beam-forming method based on QoS (quality of service). According to the method, optimizing a sum of minimum total transmitting power and inter-cell leakage total power under the given QoS constraint condition is aimed, and the influence of non-ideal CSI (channel state information) upon a system is considered. In order to fully ensure the users' QoS demand, the beam-forming problem under poorest estimated CSI is considered; an original beam-forming problem is approximated; through allelism of uplink and downlink, the downlink transmitting beam-forming problem is converted into an uplink receiving beam-forming problem; by solving the simple uplink beam-forming problem, an optimal solution of uplink receiving beam-forming is obtained and is converted into an optimal solution of downlink receiving beam-forming; thus, a solution of multi-cell downlink MIMO beam-forming is obtained.

Description

technical field [0001] The present invention relates to a Multiple Input Multiple Output (MIMO) communication system, in particular to QoS-based multi-cell downlink MIMO robust beamforming. Background technique [0002] In the next-generation cellular wireless communication MIMO system, base stations (Base Stations, BSs) tend to adopt a full-frequency multiplexing method for networking, and users suffer from severe inter-cell interference. Multi-cell cooperative downlink MIMO beamforming technology can effectively eliminate inter-cell interference and greatly improve channel capacity. However, when designing multi-cell downlink MIMO beamforming, the beamforming variables to be optimized are coupled with each other, and the solution complexity is extremely high, which brings great difficulties to the solution. The uplink-downlink duality is considered to be the main tool to solve the multi-cell cooperative beamforming algorithm, which can transform the complex multi-cell dow...

Claims

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Application Information

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IPC IPC(8): H04B7/06
CPCY02D30/70
Inventor 廖勇曹杰周昕李瑜锋张舒敏
Owner 北京中网华通设计咨询有限公司
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