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SLNR (signal-to-leakage-and-noise ratio) beam forming based user need considered power distribution method

A beamforming method and beamforming technology, applied in power management, wireless communication, electrical components, etc., can solve the problem of low fairness satisfaction

Active Publication Date: 2014-09-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of fairness between different users and low satisfaction level of each user while improving the system performance in the current beamforming method. The present invention provides a beamforming method based on SLNR Shaped power allocation method considering user needs

Method used

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  • SLNR (signal-to-leakage-and-noise ratio) beam forming based user need considered power distribution method
  • SLNR (signal-to-leakage-and-noise ratio) beam forming based user need considered power distribution method
  • SLNR (signal-to-leakage-and-noise ratio) beam forming based user need considered power distribution method

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specific Embodiment approach 1

[0077] Specific implementation mode one: combine figure 1 Describe this embodiment, the power allocation method based on SLNR beamforming in this embodiment that considers user needs, wherein the optimal iterative power allocation method includes the following steps:

[0078] Step 1: Under the condition of equal power allocation, the corresponding beamforming matrix is ​​obtained by using the SLNR beamforming method combined with user power;

[0079] Step 2: Under the beamforming matrix obtained in Step 1, obtain a feasible initial power value through the initial point selection algorithm;

[0080] Step 3: Under the initial power value obtained in Step 2, solve the approximate convex optimization problem of the established power optimization problem, and obtain the user's power allocation value;

[0081] Step 4: Use the power distribution result obtained in step 3 as the initial value of step 3, repeat step 3, and judge whether the difference between the two power distributio...

specific Embodiment approach 2

[0083] Specific embodiment 2: This embodiment is a further limitation of the power allocation method based on SLNR beamforming that considers user needs described in specific embodiment 1. The SLNR beamforming method combined with user power used in step 1 The method to obtain the corresponding beamforming matrix is:

[0084] The SLNR of user k is expressed as:

[0085] SLNR k = | | P k H k w k | | F 2 N ...

specific Embodiment approach 3

[0089] Specific embodiment 3: This embodiment is a further limitation of the optimal iterative power allocation method based on SLNR beamforming in consideration of user needs described in specific embodiments 1 or 2,

[0090] The steps of the initial point selection method in step 2 are:

[0091] Step 1: Set the equal power distribution value as the initial value P m , m=0, the i-th constraint of the optimization problem is set to c i (P).

[0092] Step 2: Calculate the non-valid set J, set J={j:c j (P k )>0}, if At the end of the algorithm, a reasonable power initial value vector is obtained. Otherwise, proceed to step three;

[0093] Step 3: Take j ∈ J, with P m As the initial value, use the interior point method to solve the following problems:

[0094] min c j (P) j∈J

[0095] s.t.c i (P)≤0

[0096] Step 4: If the optimal solution P of this subproblem m+1 meet c j (P m+1 )≤0, then m=m+1, go to step 2.

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Abstract

The invention discloses an SLNR (signal-to-leakage-and-noise ratio) beam forming based user need considered power distribution method, and belongs to the technical field of beam forming in a wireless communication system. The problems of low fairness among different users and low satisfaction corresponding to each user when system performance is improved by an existing beam forming method are solved. The method includes: acquiring a feasible initial power value through an initial point selection algorithm; solving an approximate convex optimization problem of an established power optimization problem, and acquiring power distribution values of the users; acquiring a temporary optimum power distribution value; updating an SLNR beam forming method to obtain a corresponding beam forming matrix, and acquiring an optimum power distribution result. Or, an expression of a corresponding power distribution matrix when the SLNR received by a user side is in minimum need is obtained by adopting suboptimization and utilizing an expression of the SLNR and matrix transformation, and a power distribution value is acquired so as to obtain a final power distribution result. System performance, fairness among the different users and the satisfaction corresponding to each user achieve best compromise.

Description

technical field [0001] The invention belongs to the technical field of beamforming in a wireless communication system, and in particular relates to a power allocation method based on SLNR beamforming and considering user requirements. Background technique [0002] How to improve spectrum utilization while combating channel fading and interference, and improve system capacity while ensuring communication quality are urgent problems to be solved in the LTE-A system. Multi-user MIMO and beamforming technologies can achieve the purpose of enhancing the desired signal and suppressing inter-user interference, improving communication capacity and quality. Therefore, in the LTE-A standard, technologies such as multi-user MIMO and beamforming have also been further developed. development and application. In the downlink of TD-LTE-A, the non-codebook beamforming method has received more attention in recent years because it can take advantage of the channel reciprocity in TDD mode to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/42
Inventor 吴宣利赵婉君吴玮付楠楠李卓明马哲明韩杏玲
Owner HARBIN INST OF TECH
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