On Cooperative Communications and Its Application to Mobile Multimedia

摘要: With the rapid growth of multimedia services, future generations wireless communications require higher data rates and a more reliable transmission link while keeping satisfactory quality service. In this respect, multipleinput multiple-output (MIMO) antenna systems have been considered as an efficient approach to address these demands by offering significant multiplexing diversity gains over single-antenna without increasing requirements on radio resources such bandwidth power. Although MIMO can unfold their huge benefit in cellular base stations, they may face limitations when it comes deployment mobile handsets. particular, typically small-size handsets makes impractical deploy multiple antennas. To overcome drawback, concept cooperative has recently proposed gained large interest research community. The key idea is form virtual array utilizing third terminal, so-called relay node, which assists direct communication. After receiving source’s message, processes forwards destination. approach, benefits be attained distributed fashion. Furthermore, efficiently combat severity fading shadowing effects through assistance terminals. It shown that using extend coverage networks. thesis, we focus performance evaluation communication application multimedia. thesis divided into five parts. first part proposes hybrid decode-amplify-forward (HDAF) relaying protocol significantly improve compared two conventional schemes decode-and-forward (DF) amplify-and-forward (AF). interesting see gain HDAF DF AF strictly depends relative value channel conditions between hops. second extends case relays. important note are saturated number relays tends value. This observation motivates us use small reduce network overhead well system complexity obtained still much large-number case. part, analyze networks with best selection Nakagami-m channels. Besides gain, show spatial achieved communications. We terms symbol error rate ergodic capacity composite Finally, fifth exploit both proposing unequal scheme for services