Research And Implementation Of Non-Coherent MIMO Spatial-Multiplexing

In wireless high-speed mobile environment,accurate and real-time compensation for phase offset and Doppler shift are essential for coherent communication systems.Which means complex computing and high hardware costs.Non-coherent detection has been developed to avoid those defects.Energy detection is one of the non-coherent detection technology,which is immune to random phase interference and Doppler shift at the same time of simple construction.The transmission efficiency and capacity can be further improved by spatial multiplexing or diversity in MIMO.The combination between MIMO and energy detection can meet the requirements of higher transmission capacity and reliability for high-speed wireless services.Here non-coherent MIMO based on the optimum receiver of random phase signal is proposed.The wireless transceiver system is built with software defined radio,and the performance is measured with VR5 in high-speed railway channel.The main research contents are as follows:1.The research status of non-coherent MIMO is introduced.The optimum receivers of random phase signal are analyzed.The MIMO channel model of high-speed mobile communication channel is analyzed.2.The non-coherent MIMO MFSK energy detection system is proposed based on the combination between MIMO and MFSK energy detection.The performance is analyzed through the theoretically derived and simulation.Based on the position of energy detection in each frequency is fixed,the new MLD based on the fixed position is proposed,the complexity of demodulation is reduced.3.Based on the combination between MIMO and FSK random phase detection,MIMO FSK random phase detection system is proposed.The theoretical formula is derived,the system model is simplified.The performance over high-speed railway channel is analyzed through simulation.The feasibility of the system is verified theoretically.Also the MIMO Chirp-BOK system is introduced and it’s performance over high-speed railway channel is analyzed.4.The 4×4 MIMO FSK、MIMO Chirp-BOK,2×2 MIMO MFSK wireless transceiver system is built with USRP and Labview.The systems are test over scattering environment.The performance of systems are measured with VR5 over standard LTE-R channel.