Space-time linear constellation precoded systems.

摘要

Establishing reliable communication links over wireless channels must cope with challenges such as multipath fading, bandwidth, and power limitations. Diversity techniques have emerged as an effective means to combat multipath fading effects, and have been widely adopted by many current or developing wireless communication standards, including 3-G systems and 4-G prototypes. Linear constellation precoding is a bandwidth- and power-efficient tool in enabling diversity transmissions over single-antenna and multi-antenna fading channels.; We present in this thesis a comprehensive study on constructions and applications of linear constellation precoders (LCPs). From the design perspective, we first present analytical constructions of real LCPs (RLCPs) and complex LCPs (CLCPs) over quadrature amplitude modulation (QAM), pulse amplitude modulation (PAM), and phase-shift keying (PSK) constellations. We show that our RLCPs and CLCPs can always achieve maximum diversity gain. We derive coding gains for RLCPs and CLCPs over constellations carved from the square lattice and the hexagonal lattice, which include any size of QAM, PAM, 3-PSK, and 6-PSK. We also prove the optimality of our constructions for many cases of practical interest. From the application perspective, we develop two space-time (ST) linear constellation precoded schemes with different design objectives in quasi-static fading scenarios. We finally design linear constellation precoded orthogonal frequency division multiplexing (OFDM) transmission schemes for frequency-selective fading channels.