search query: @instructor Riihonen, Taneli / total: 9
results-list
reference: 4 / 9
« previous | next »
Author:Dhamala, Ujjwal Prakash
Title:On the practicability of full-duplex relaying in OFDM systems
Publication type:Master's thesis
Publication year:2011
Pages:[4] + 62      Language:   eng
Department/School:Signaalinkäsittelyn ja akustiikan laitos
Main subject:Signaalinkäsittelytekniikka   (S-88)
Supervisor:Wichman, Risto
Instructor:Riihonen, Taneli
Electronic version URL: http://urn.fi/URN:NBN:fi:aalto-201302031396
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
Instructions
close

Reading digital theses in the closed network of the Aalto University Harald Herlin Learning Centre

In the closed network of Learning Centre you can read digital and digitized theses not available in the open network.

The Learning Centre contact details and opening hours: https://learningcentre.aalto.fi/en/harald-herlin-learning-centre/

You can read theses on the Learning Centre customer computers, which are available on all floors.

Logging on to the customer computers

  • Aalto University staff members log on to the customer computer using the Aalto username and password.
  • Other customers log on using a shared username and password.

Opening a thesis

  • On the desktop of the customer computers, you will find an icon titled:

    Aalto Thesis Database

  • Click on the icon to search for and open the thesis you are looking for from Aaltodoc database. You can find the thesis file by clicking the link on the OEV or OEVS field.

Reading the thesis

  • You can either print the thesis or read it on the customer computer screen.
  • You cannot save the thesis file on a flash drive or email it.
  • You cannot copy text or images from the file.
  • You cannot edit the file.

Printing the thesis

  • You can print the thesis for your personal study or research use.
  • Aalto University students and staff members may print black-and-white prints on the PrintingPoint devices when using the computer with personal Aalto username and password. Color printing is possible using the printer u90203-psc3, which is located near the customer service. Color printing is subject to a charge to Aalto University students and staff members.
  • Other customers can use the printer u90203-psc3. All printing is subject to a charge to non-University members.
Location:P1 Ark Aalto  693   | Archive
Keywords:full-duplex relay
loop interference cancellation
transceiver non-idealities
analog-to-digital conversion
quantization
dynamic range
error vector magnitude
OFDM
Abstract (eng): A full-duplex relay is spectrally more efficient than a half-duplex relay because it uses the full band of available frequencies to receive and transmit signals simultaneously.
However, the loop interference arriving at the receiver of the relay due to its own transmission is a major hindrance that must be overcome before the idea of full-duplex relaying can be put to practice.
The simple technique of subtractive cancellation alone, in theory, could eliminate the loop interference completely from the received signal.
In practice, however, the nonidealities inherent in the actual components within the relay transceivers create less than ideal conditions for the cancellation to work perfectly.

This thesis studies the effect of such nonidealities on the performance of a single-input-single-output (SISO) full-duplex relay.
The primary focus is on formulating an analytical framework that helps evaluate the feasibility of such a relay.
The outcome illustrates that a number of factors determine whether the idea of a full-duplex relay with subtractive loop interference cancellation can be implemented in practice.
As expected, it is necessary to have an analogy to-digital converter (ADC) with a large dynamic range at the receiver to ensure that the incoming can be digitized with sufficient accuracy.
Another important requirement is to have an excellent transmitter with a very small error vector magnitude (EVM) because the contribution of the unknown random error in the transmitted signal to the loop interference cannot be cancelled no matter how accurately the incoming signal is digitized.
Moreover, the physical design of the relay must, by itself, be able to provide a certain amount of natural isolation between the transmitting and receiving antennas; otherwise, the part of the loop interference resulting from the transmitter error alone can be sufficient to drown the useful signal beyond recovery.
ED:2011-11-07
INSSI record number: 42911
+ add basket
« previous | next »
INSSI