Synchronization In Multi-antenna Communication Systems, Equalization And Signal Detection Technology Research

Multi-antenna systems are the spread of single-antenna systems. When the transmitter and the receiver use more than one antenna, MIMO channel is constructed. As information theory indicates, MIMO channel has larger capacity. This means multiple-antenna systems can transmit information with higher data rate when the bandwidth and signal-noise-ratio is fixed. So the study of multi-antenna systems is significant.Like single-antenna systems, synchronization, equalization, and signal detection are required in multiple-antenna systems. Our research work focuses on these topics. In chapter 3, carrier synchronization and equalization of multi-antenna QAM systems are studied. In chapter 4, signal detection of multi-antenna TD-SCDMA systems is studied. In chapter 5, clock synchronization of multi-antenna OFDM systems is studied. In these chapters, we also give a brief introduction to other modules in the receiver, which enables the chapter to construct a complete system.Nowadays, all-digital implementation of communication systems becomes popular. Therefore, our research work is based on all digital receivers. In addition, low complexity is pursued in our research work. Therefore, the algorithms presented in this paper are practical.Now introduce some fruits in this paper. For multiple-antenna QAM systems, a carrier frequency offset estimation algorithm that could work in frequency selective fading channel is presented. The algorithm is not sensitive to clock synchronization error, and can work under multiple sampling rate. For multiple-antenna QAM systems, a carrier frequency offset detection algorithm that has low complexity is proposed. The algorithm could be combined with carrier phase offset detection algorithm. For multiple-antenna QAM systems, a novel equalizer whose tap could be moved according to channel response is proposed. This equalizer has lower complexity and better performance than conventional ones. For multiple-antenna TD-SCDMA systems, a symbol by symbol multi-user detection algorithm is presented. The algorithm has lower complexity than block detection algorithm. For multiple-antenna OFDM systems, a clock frequency offset detection algorithm is presented. The algorithm can work before carrier frequency offset compensation.