Research of distributed Space-Time Coding techniques in Co-MIMO system

Single-antenna terminals that cooperate with each other could form a virtual multi-antennas array. Combined with the multi-antennas at the receiver (Base Station), it could realize cooperative MIMO system, applying the theory of space-time coding in MIMO system to the cooperative MIMO system in addition, Thus these single terminals could efficiently utilize the spatial-diversity gain and the coding gain in the multi-antenna MIMO systems, which could resist the multi-path fading, and improve the performance. This dissertation emphasizes the D-STBC and D-VBLAST in the cooperative MIMO in detail. Applying D-STBC to the cooperative MIMO, it can efficiently take advantage of the spatial-diversity with easy coding and superior performance, so we study the mathematical model of D-STBC firstly; then design the structure of the detection at the receiver, pointing out the complexity of the ML detection grows exponentially with the increase of cooperative node numbers, and derive the performance of the PEP with the use of ML detection algorithm. We also present the D-VBLAST which is based on the spatial multiplexing. It can efficiently improve the data transmission rate (i.e. throughput capacity), and the complexity of the decoding algorithm grows linearly with the increase of data rate, especially fits to the cooperative MIMO system with higher SNR.