WIRELESS COMMUNICATIONS

Crediti: 
9
Settore scientifico disciplinare: 
TELECOMUNICAZIONI (ING-INF/03)
Anno accademico di offerta: 
2016/2017
Semestre dell'insegnamento: 
Primo Semestre
Lingua di insegnamento: 

Language

English

Obiettivi formativi

Instruction aim

1) Knowledge and understanding
The course presents the principles of current wireless communication systems, with a rigorous approach and attention to an operational knowledge.

2) Applying knowledge and understanding
Students learn to:
- use the main channel models to analyze and design wireless communication systems
- use the main diversity, MIMO and resource allocation schemes
- evaluate the performance of wireless communication systems
- select the most suitable solutions in order to meet specifics in terms of performance and cost, also accounting for possible application constraints.

Prerequisiti

Prerequisites

Typical knowledge of a graduate of the Class of Information Engineering are required (first level degree).

Contenuti dell'insegnamento

Outline

Channel models. Channel capacity. Diversity techniques. Multiple-input multiple-output (MIMO) systems. Resource allocation techniques.

Programma esteso

Detailed outline

1. Channel models (22 h)
1.1 Review of radio propagation (2 h)
1.2 Path loss models (5 h)
Free space
Flat earth
Empirical models
Ray tracing
1.3 Shadowing model (3 h)
Lognormal distribution
Spatial correlation
Outage probability
1.4 Fading models (11 h)
Rayleigh
Rice
Nakagami
Multipath
1.5 MIMO channel models (1 h)

2. Performance of wireless systems (15 h)
2.1 Channel capacity (12 h)
Ergodic capacity with CSIR
Outage capacity
Ergodic capacity with CSIT
Power allocation strategies
High and low SNR regimes
2.2 Average error probability (3 h)
By direct integration
By the moment generating function
Alternate representation of the Gaussian tail function

3. Diversity techniques (13 h)
3.1 Time, frequency and space diversity (1 h)
3.2 Diversity combining (4 h)
Selection combining
Maximal ratio combining
Equal gain combining
3.3 Transmit diversity (2 h)
Maximal ratio transmission with CSIT (beamforming)
Transmit diversity with CSIR (Alamouti scheme)
3.4 Performance analysis of diversity systems (6 h)
Average error probability
Outage probability
Outage capacity
High and low SNR regimes

4. MIMO systems (17 h)
4.1 Singular value decomposition (3 h)
Singular values
Left and right singular vectors
Parallel decomposition of the MIMO channel
4.2 Capacity of the deterministic MIMO channel (5 h)
Capacity with CSIT
Water filling in the channel eigenmodes
Degrees of freedom and spatial multiplexing gain
Capacity with CSIR
4.3 Capacity of the fading MIMO channel (3 h)
Capacity achieving distribution with CSIR
High and low SNR regimes
MIMO outage capacity
4.4 Realistic MIMO systems (6 h)
MIMO diversity and beamforming
Diversity-multiplexing tradeoff
Overview of space-time codes and examples
Overview of multiuser MIMO

5. Introduction to OFDM (5 h)
5.1 Realization of OFDM (4 h)
Direct-form
DFT-form
Cyclic-prefixed
5.2 Resource allocation (1 h)
Single-carrier systems
OFDM systems

Bibliografia

Reference texbook

A. Goldsmith, Wireless communications, Cambridge University Press, 2005.

Metodi didattici

Instruction methods

The course is organized in lectures, excercises and laboratory sessions. Homework assignments complement classroom activity.

Modalità verifica apprendimento

Evaluation methods

Evaluation comprehensively based on:
- Level of active (and regular) participation to classroom lectures, exercises and laboratory activity
- Periodically assigned homeworks
- Final exam including written and oral tests.

Remedial evaluation based on written examination, oral examination and project.

Altre informazioni

Other issues

The course relies upon a specific web site.