Space-time Coding In Mimo Wireless Communications And Multimedia Transmission Study

The data rate and reliability of communication systems can be greatly improved by spatial multiplexing and diversity gain, respectively provided by multiple-input multiple-output (MIMO) which is already adopted by some standards and protocols. In MIMO systems, space-time coding combines channel coding and antenna diversity technologies so as to effectively utilize spatial multiplexing and diversity. In addition, providing high-quality multimedia service is an important task of the future wireless communication systems. Space-time coding and hierarchical multimedia transmission in MIMO systems, both of which have been attracting much attention in the literatures and applications, are researched in this thesis.To begin with, the transmission model of MIMO wireless communication system is constructed. Then space-time codes of diversity and multiplexing type are researched, respectively. Later, some researches have been done on the structure of multilayered space-time trellis codes (ML-STTC) which is the tradeoff between diversity and multiplexing. The adaptive power allocation, the combination of ML-STTC and rate-adaptive channel coding and modified minimum mean square error (MMSE) group detection algorithms are proposed for ML-STTC. At last, the hierarchical multimedia transmission is researched and several hierarchical transmission schemes based on sub-stream allocation, ordered array processing and power allocation are given. This thesis mainly consists of ML-STTC and hierarchical multimedia transmissions, and some conclusions have been drawn as follows.1. The nonuniform ML-STTC which generalizes ML-STTC and makes it more flexible is researched. The system performance is simulated when different allocation schemes are applied to STTC encoders of different layers, and then the optimized allocation criteria is given. After optimization, the complexity and delay of the nonuniform ML-STTC are lower than the uniform one at equivalent performance.2. According to the MMSE detection algorithm for Bell Laboratories Layered...