The Study Of Super Qusi-Orthogonal Space-Time Coding

Multiple-input multiple-output (MIMO) systems can improve channel capacity and spectral efficiency without spreading the system bandwidth or increasing transmit power in wireless fading channel, and can satisfy the desire of the future wireless communication systems. The technique of space-time coding in MIMO systems is an ideal candidate for improving wireless communication performance and increasing data rates for bandwidth constraint systems, which has attracted considerable attention.If the channel state information (CSI) is available at the receiver, the main three kinds of space-time coding have been proposed include layered space-time coding (LSTC), space-time trellis coding (STTC) and space-time block coding (STBC). The new space-time coding methods have presented for the very recent years, to obtain the better performance of MIMO systems furtherly.In a quasi-static slow fading channel, the design criterion for space-time codes guarantee the maximum possible diversity gain and coding gain at high SNRs. So first,we discusses different space-time coding methods in detail for the last few years,including space-time block codes (STBC), space-time trellis codes (STTC), Quasi-orthogonal space-time block codes (QOSTBC), Super-orthogonal space-time trellis codes(SOSTTC) and Super-quasi-orthogonal space-time trellis codes(SQOSTTC). The detailed discussion of each method includes design, complexities of encoding and decoding, performance analysis, and simulation results. Our overall goal is to find a cord providing full-diversity, full-rate and keep a balance between the theory and the practice of space-time coding.A new super-quasi-orthogonal space-time trellis code (SQOSTTC) is proposed in this thesis. The new SQOSTTC is based on a set of quasi-orthogonal space time block codes (QOSTBC) proposed by introducing rotation coefficient, and combine the constellation rotations of SOSTTC. This code can provide full-diversity, full-rate as well as lower decoding complexity. The theory analysis and simulation results show that a few improvements over the code presented by Jafarkhani are attained.