Reduction of interference using Orthogonal Vertical Beamforming in an indoor communication

Paleerat Wongchampa

doi:10.1051/matecconf/201927702013

Abstract

The interference between users is one of the factors that limit the achievable user throughput in the current indoor communication. In this paper, an evaluation of transmit beamforming contribution is analyzed in the context of an indoor environment. The technique of the Orthogonal Vertical Beamforming (OVB) has been proposed to reduce interference in an indoor communication. The proposed concept is validated through computer simulation in term of Signal Interference plus Noise Ratio (SINR). The obtained results show that the OVB provides higher performance over the conventional vertical beamforming and Orthogonal Beamforming (OBFM) in an only vertical plane.

Highlights

IntroductionThe wireless communication in indoor mainly used the wireless local area network WLANs WLANs has been very popular 1 because a lot of its utilities WLANs does give us the convenience and freedom for the usage and to set up the WLANs network could possibly connect in house or office computer system there s no need to use uncomfortable signal cable for connecting the network Portable PC and notebooks could connect freely in the signal range area to each other or the network from other distances The IEEE 802 11ac was the new WLANs which would be targeted to replace IEEE 802 11n The Multiple Input Multiple Output MIMO technology has used in IEEE 802 11ac The MIMO technique needs the feedback information to the system The beamforming is the technique which without the feedback information So, the beamforming is less complex than MIMO when using in an indoor communication
From the work presented in 2, the Orthogonal Beamforming OBFM mainly considered the gain provided by the horizontal plane while cannot considering the gain by the vertical plane shown in Fig 1 The figure 1 a and b show the top view and side view of the scenario of users stay at the same direction angle in horizontal plane but they are located in different distances In this case, the proposed OBFM cannot handle as it can only the horizontally form one beam to one particular user The results of conventional vertical beamforming concept 3 4 are low Signal to Interference plus Noise Ratio SINR because the interference from other users shown in figure 2 this paper proposes
The concept of OVB in this paper is depicted in figure 3 As we can see, the users stay at the same angle in the horizontal plane but they are located at different distances So, the beam must be able to tilt along with orthogonal in the vertical plane to each user This paper focuses on a propagation scenario in multi user communications an indoor environment Consider a downlink system consisting of an Access Point AP consists of N

Summary

Introduction

The wireless communication in indoor mainly used the wireless local area network WLANs WLANs has been very popular 1 because a lot of its utilities WLANs does give us the convenience and freedom for the usage and to set up the WLANs network could possibly connect in house or office computer system there s no need to use uncomfortable signal cable for connecting the network Portable PC and notebooks could connect freely in the signal range area to each other or the network from other distances The IEEE 802 11ac was the new WLANs which would be targeted to replace IEEE 802 11n The Multiple Input Multiple Output MIMO technology has used in IEEE 802 11ac The MIMO technique needs the feedback information to the system The beamforming is the technique which without the feedback information So, the beamforming is less complex than MIMO when using in an indoor communication. The rest of this paper is as follows After the brief introduction, a brief concept of the OVB is described in Section 2 the computer simulation is performed to show the performance of proposed concept in Section 3 Section 4 concludes the paper a

Concept of Orthogonal Vertical Beamforming

Simmulation results

Conclusion