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Joint Vertical Beam Steering and Power Allocation Method in 3D Massive MIMO System

A technology of vertical beam and distribution method, applied in transmission systems, radio transmission systems, electrical components, etc., can solve the problems of system performance pilot pollution limitation, pilot pollution, etc.

Active Publication Date: 2018-01-19
CERTUS NETWORK TECHNANJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the current research is still carried out under the assumption of ideal channel state information (CSI), and does not involve the problem that the system performance will be limited by pilot pollution when the number of antennas is large and the number of service users is large, especially in The problem of pilot pollution becomes more serious when the number of service users in each vertical sector is large and it may be necessary to reuse pilots between sectors

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  • Joint Vertical Beam Steering and Power Allocation Method in 3D Massive MIMO System
  • Joint Vertical Beam Steering and Power Allocation Method in 3D Massive MIMO System
  • Joint Vertical Beam Steering and Power Allocation Method in 3D Massive MIMO System

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Embodiment

[0074] Considering a 3D massive MIMO system, L horizontal sectors form a cooperative cluster, and each horizontal sector consists of a matrix number M (vertical direction N v root, horizontal direction N t root) area array antenna service, where the number of M can reach hundreds. Each horizontal sector serves K (Kl0 and θ l1 respectively represent the antenna downtilt angles of the lth cell serving the near sector and the far sector, such as figure 1 shown. The total power of the base station is P, and the power of the near sector serving the lth cell is P l0 , the power in the far sector is P l1 , the user's uplink transmission power is p r .

[0075] Using the block fading channel model, the fast fading coefficients remain constant within the coherence interval of T OFDM symbols. The M×1-dimensional uplink channel vector from user k in cell l to target base station j can be expressed as where β jlk Indicates the large-scale fading coefficient, including path loss ...

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Abstract

The present invention discloses a combined vertical beam control and power allocation method in a 3D large-scale MIMO system, the method comprising following steps: 1) dividing each cell into two vertical sectors according to user location distribution, and multiplexing a set of same pilot frequency sequence in the vertical sectors for uplink channel estimation; 2) during a downlink data transmission stage, firstly, based on results of the uplink channel estimation and initiation results of the sector to which uplink users belong, using maximal transmission as a downlink precoding algorithm and a maximal sum rate as a goal, jointly optimizing the 3D antenna array weighting vector w10 and sending power p10 of a near sector and the 3D antenna array weighting vector w11 and sending power p11 of a far sector in each cell; then according to the beam gain of each sector after optimization, re-dividing users into a sector having a larger beam gain; repeating the steps in 2) until the condition of the sector to which the users belong does not change; so far, completing the combined vertical beam control and power allocation in a 3D large-scale MIMO system.

Description

Technical field: [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a combined vertical beam control and power distribution method in a 3D massive MIMO system. Background technique: [0002] At the end of 2010, Thomas L. Marzetta, a scientist at Bell Labs, proposed the concept of massive MIMO (LargeScale MIMO or Massive MIMO). A base station equipped with hundreds of antennas simultaneously serves dozens of users using the same time-frequency resources. Studies have shown that when the number of base station antennas is large, the original random variables tend to definite values, so simple signal processing methods can effectively reduce the interference between users; in addition, when the scale of base station antennas is large, the equivalent signal-to-noise The ratio increases linearly with the number of base station antennas, which means that the more antennas, the smaller the transmit power required to obtain th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/08
CPCH04B7/0426H04W72/0473
Inventor 张国梅王兵吕刚明李国兵任俊臣
Owner CERTUS NETWORK TECHNANJING
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