Campus del Baix Llobregat
 
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(2012-2)

DG ENG AERO/SIS TEL

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ENG TELEC 2NCICLE 01

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MU AEROSPACE S&T 09

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Projecte llegit

Títol: Performance Analysis of Frame Slotted Aloha with Diversity Assisted by Interference Cancellers

Estudiants que han llegit aquest projecte:

Director: ALONSO ZÁRATE, Luis

Departament: TSC

Títol: Performance Analysis of Frame Slotted Aloha with Diversity Assisted by Interference Cancellers

Data inici oferta: 20-03-2013     Data finalització oferta: 20-11-2013


Estudis d'assignació del projecte:
    ENG TELEC 2NCICLE 01
    ET AERONÀUTICA 03
    ETT SIST TELEC 00
    ETT TELEMÀTICA 00
    GR ENG AERONAVEGACIÓ
    GR ENG AEROPORTS
    GR ENG SIS TELECOMUN
    GR ENG TELEMÀTICA
    MU AEROSPACE S&T
    MU MASTEAM
Tipus: Individual
 
Lloc de realització: Fora UPC    
 
        Supervisor extern: Joan Bas
        Institució/Empresa: CTTC
        Titulació del Director: Doctor en Telecomunicacions
 
Paraules clau:
M2M, frame slotted aloha , diversitat i cancel.lador d'interferències
 
Descripció del contingut i pla d'activitats:
L'estudiant haurà de realitzar un estudi de la viabilitat pràctica d'un sistema de comunicacions M2M basat en frame slotted aloha amb diversitat i cancelador d'interferències. L'estudiant haurà d'implementar el software de simulació en MATLAB per estimar el cost energetic i comparar-lo amb el frame slotted aloha sense diversitat.
 
Overview (resum en anglès):
Since 1995, Machine to Machine (M2M) networks are spreading very quickly. These technologies allow both wired and wireless system communicating with other devices of the same type. Regardless of the type of machine or data, information usually is distributed in the same way, from a machine to a network, and then through a gateway to a system where it can be reviewed.

This type of communications require new protocols and optimizations to minimize the energy consumption of the devices of the network to extent their battery life-times.

The M2M network considered in this work is composed of a group of devices that are collecting data and, periodically, transmit this data to a coordinator upon request. Once each device is able to transmit the information correctly, passes into a sleep mode for saving energy.

Generally, the use of random access protocols such as Aloha provides good results due to its low complexity. On the contrary, its performance is degraded drastically when the data traffic load increases or the number of devices is huge, which is the case in dense M2M networks. For that reason, new versions of the Aloha protocol were developed, such as Slotted-Aloha, which doubles the throughput of classical Aloha.

Based on Slotted-Aloha, a new access protocol called Successive Interference Cancellation Frame Slotted Aloha (SICFSA) has been proposed in recent works. In SICFSA, the transmitter devices send multiple copies (replicas) of a data packet in different time slots. Each data packet indicates the time slots where the other replicas are transmitted. At the receiver side, i.e., the coordinator, it tries to recover the data from the transmitters by means of a Successive Interference Cancellation (SIC) algorithm.

In order to successfully decode the transmitted packets, the coordinator has to identify the time-slots free of collisions. In this way, this information can be reused in the time-slots with collisions to decode data packets that have collided in the access to the channel.
This work evaluates, by means of computer-based simulations using MATLAB and C, the delay and energy performance of a data-collection M2M network that uses SICFSA. The performance of SICFSA is compared with the one of conventional FSA. Results show that SICFSA outperforms FSA in about 50% in terms of delay and coordinator energy consumption, and in terms of devices energy consumption outperforms FSA in about 5%.


Data de generació 26/01/2021