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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 invention discloses a joint vertical beam control and power allocation method in a 3D massive MIMO system, which includes the following steps: 1) Divide each cell into two vertical sectors according to user location distribution and multiplex between vertical sectors A set of identical pilot sequences is used for uplink channel estimation; 2) In the downlink data transmission stage, first, based on the results of the uplink channel estimation and the initialization results of the sectors to which the uplink users belong, maximum ratio transmission is used as the downlink precoding algorithm to maximize and rate as the goal, jointly optimize the 3D antenna array weighting vector wl0 and transmission power pl0 of the near sector of each cell, and the 3D antenna array weighting vector wl1 and transmission power pl1 of the far sector; then, according to the optimized According to the beam gain, the users are re-divided into sectors with larger beam gains; repeat the steps in 2) until the situation of the sectors to which the users belong remains unchanged; at this point, the joint vertical beam control and power allocation in the 3D massive MIMO system are completed.

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): H04W72/08H04W72/54
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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