Multi-antenna full-duplex system distributed beam forming method based on ADMM (Alternating Direction Method of Multipliers)

A beamforming and beamforming matrix technology, which is applied in the field of distributed beamforming of multi-antenna full-duplex systems based on ADMM, can solve the problems of slow convergence speed, difficulty in taking into account system performance improvement and fast convergence, etc.

Active Publication Date: 2018-01-26
RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a multi-antenna full-duplex system based on ADMM in order to solve the defects that the existing multi-antenna multi-full-duplex relay network distributed beamforming design has a slow convergence speed, or it is difficult to take into account both system performance improvement and fast convergence Distributed Beamforming Method

Method used

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  • Multi-antenna full-duplex system distributed beam forming method based on ADMM (Alternating Direction Method of Multipliers)
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  • Multi-antenna full-duplex system distributed beam forming method based on ADMM (Alternating Direction Method of Multipliers)

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Embodiment 1

[0061] This embodiment discloses a multi-antenna full-duplex system distributed beamforming method based on an alternating direction multiplier method, which is especially suitable for joint design of base station and relay beamforming in a multi-relay network. The schematic diagram of multi-antenna multi-full-duplex relay system is attached figure 1 As shown, the flow chart of the ADMM-based multi-antenna multi-full-duplex relay network distributed beamforming method is shown in the attached figure 2 As shown, the specific steps of the method include:

[0062] S1. Initialize system parameters. The number of base station antennas in the multi-relay network is N B , the number of multi-antenna full-duplex relays and single-antenna users is L, and the number of transmitting and receiving antennas of each multi-antenna full-duplex relay is N t and N r . The transmitted symbol vector for a given base station is and satisfied The base station transmit beamforming matrix i...

Embodiment 2

[0104] This embodiment specifically discloses a distributed beamforming method for a multi-antenna full-duplex system based on the alternating direction multiplier method, including the following steps:

[0105] S1. Initialize system parameters. Consider the receiving antenna N of multi-antenna full-duplex relay r = 1 case. The number of base station antennas is N B =4, the number of multi-antenna full-duplex relays and single-antenna users in the system is L=2, and the number of transmitting antennas for each relay is N t =3. Since the number of relay receiving antennas is 1, the transmitted symbol on the backhaul link i from the base station to the relay is x B,i , and satisfy E{|x B,i | 2}=1. The base station transmits the beamforming matrix as u B,i ∈ C 4×1 , the channel matrix of backhaul link i is Send symbol x for a given relay i R,i , and satisfy E{|x R,i | 2}=1, the beamforming vector of relay i is u R,i ∈ C 3×1 , the relay interference matrix is ​​h ...

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Abstract

The invention discloses a multi-antenna full-duplex system distributed beam forming method based on an ADMM (Alternating Direction Method of Multipliers). The method is applicable to multi-interference combined inhibition of a multi-relay multi-antenna full-duplex system, and reduces total sending power of the system under the constraint of a user rate. By utilizing an ADMM algorithm, the problemthat due to non strict convex of an original problem, convergence cannot be carried out is solved, and meanwhile, a convergence rate is promoted. The method comprises the following steps of: (1) initializing system variables; (2) constructing an ADMM problem in a compact form, and decoupling the problem; and (3) solving an augmented Lagrangian function minimization problem at each relay to obtainoriginal and slack variables, and broadcasting the original and slack variables to all the relays so as to update a dual variable. The step (3) is repeated until a preset stopping criterion is met. Asolution obtained after final iteration is output, and a final iteration solution of the original variable is subjected to feature value decomposition or Gaussian randomization so as to obtain a distributed beam forming matrix and a beam forming vector.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a distributed beamforming method for a multi-antenna full-duplex system based on ADMM (Alternating Direction Method of Multipliers, Alternating Direction Method of Multipliers). Background technique [0002] In a multi-antenna full-duplex relay system, in order to solve the coverage problem of users within the service area, it is often necessary to deploy multiple full-duplex relays. In this scenario, there are relay self-interference and inter-relay interference in the system. and multi-user interference, it is no longer feasible to design a centralized optimization scheme that simultaneously suppresses multiple types of interference. Some people have studied the resource allocation in the multi-antenna multi-full-duplex relay OFDMA system, adopting the method of end-to-end link orthogonal isolation and assigning different frequency bands to different rela...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04B7/0426H04L5/14
Inventor 陈翔林靖靖龚杰陆许明陈晓春
Owner RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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