UNIVERSITÀ DI PISA
FACOLTÀ DI INGEGNERIA
CORSO DI LAUREA IN
INGEGNERIA DELLE TELECOMUNICAZIONI
Tesi di Laurea Specialistica
Linear Dispersion Codes for MIMO Wireless Communications
Matching the Discrete-Input Continuous-Output Channel Capacity
Candidato Luca Ghelarducci
Relatori Prof. Marco Luise Prof. Filippo Giannetti Dott. Stephan Pfletschinger
Contents
Introduction
11
Multiple-Input Multiple-Output systems
5
1.1 Multiple antennas model . . . 7
1.2 Multiplexing gain and Diversity gain . . . 10
1.3 Space – Time Block Codes . . . 12
2
Modeling Encoded MIMO Communications
16
2.1 FEC coding . . . 182.2 Interleaver . . . 21
2.3 Modulation and MIMO scheme . . . 22
2.4 Mapping and soft demapping . . . 22
3
Capacity computation
26
3.1 MIMO Channel capacity . . . 263.2 Efficient computation of channel capacity: BICM . . . 30
3.3 Efficient computation of channel capacity: CM . . . 32
4
Linear Dispersion Codes
36
4.1 Channel model and Linear Dispersion framework . . . 36 4.2 Algorithm for maximizing the DCMC capacity . . . 38
5
Numerical results
41
5.1 Capacity of MIMO 2x1 systems . . . 41 5.2 Capacity of MIMO 2x2 systems . . . 51