AP selection method of cell-free large-scale antenna system

A large-scale antenna and cell technology, applied in radio transmission systems, diversity/multi-antenna systems, transmission systems, etc., can solve the problems that APs cannot accurately obtain channel state information, link influence, multiplexed pilots, etc., and achieve Effects of reducing pilot pollution, reducing bit error rate, and avoiding pilot pollution

Active Publication Date: 2021-09-17
HANGZHOU DIANZI UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the number of orthogonal pilots, users need to reuse pilots
The multiplexing of the pilot frequency leads to the inability of the AP to accurately obtain the channel state information, so that both the uplink and the downlink will be seriously affected. This adverse effect is called pilot pollution.

Method used

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  • AP selection method of cell-free large-scale antenna system
  • AP selection method of cell-free large-scale antenna system

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Embodiment 1

[0034] An AP selection algorithm for a large-scale antenna system without a cell of the present invention will be described below with reference to the accompanying drawings and in combination with preferred embodiments of the present invention.

[0035] Step 1: For a non-cell large-scale antenna system with M APs and K users, the number M of APs is far greater than the number K of users. The number of orthogonal pilots in the system is T, and T

[0036] Step 2: Each AP judges the user type according to the distance from the user. Here, user types are classified according to the threshold Th1 and the threshold Th2. Such as figure 1 and 2 As shown, d(AP 1 ,UE 1 )≤Th1,d(AP 1 ,UE 2 )≤Th1, then the first user User1 and the second user User2 are the first API users. Th11 ,UE 3 )1 ,UE 4 )≥Th2 means that the fourth user User4 is a Class III user of the first AP.

[0037] Step 3: For the Type I users of AP1, User1 an...

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Abstract

The invention discloses an AP selection method of a cell-free large-scale antenna system. The method comprises the following steps: 1, for a cell-free large-scale antenna system comprising M APs and K users (K is greater than T and less than M), the K users share the T pilots in a pilot multiplexing mode. 2, each AP judges the user type according to the distance between the AP and the user, wherein the user type comprises the I type, the II type and the III type; 3, for I-type users of the APs, the APs directly serve as service APs of the users; for the II-type users of the AP, if the I-type users exist, the providing of services for the II-type users is abandoned when the II-type users of the AP share the pilot frequency with the I-type users; otherwise, services are provided for the I-type and II-type users at the same time; if only the II-type users exist, the II-type users of the AP are allowed to share the pilot frequency according to a fairness principle; for the III-type users of the AP, the AP will give up to provide service for the users. Pilot frequency pollution can be effectively avoided, the system energy efficiency is improved, and the bit error rate of a receiving end for demodulating signals of a sending end is reduced.

Description

technical field [0001] The invention relates to the fields of a large-scale antenna system without a cell, pilot multiplexing, AP selection and the like in a wireless communication system, and specifically provides an AP selection method for a large-scale antenna system without a cell. Background technique [0002] Cell-free large-scale antenna technology, also known as Cell-free Massive Multiple Input Multiple Output (Massive MIMO), adopts a cell-free network architecture and installs a large number of one or Access points (APs) with multiple antennas are distributed in a large area, transmit data to the central processing unit (CPU) through the backhaul link, and use the same time-frequency resources to provide services for multiple users. Cell-free massive MIMO introduces the idea of ​​"user-centricity", where the number of antennas on the AP end is usually far greater than the number of users. This technology reduces the average distance between APs and users, greatly r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0413H04B7/06H04L5/00H04W48/04
CPCH04B7/0413H04W48/04H04L5/0048H04B7/0626Y02D30/70
Inventor 方铭许方敏曹海燕郑长亮
Owner HANGZHOU DIANZI UNIV
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