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Practical Analysis of Impact of Transmitter Hardware Impairments for MIMO Channel Measurement

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Multiple Input Multiple Output MIMO is one of the promising technologies for the high data rate wireless Communication and adapted in many wireless standards. MIMO Channel measurement is an essential process based on which the decoding of symbols, equalization and adaptive transmission can be implemented. Hence, real time measurement of MIMO channel response and characterization is important one. Many research works has been carried out in the area of MIMO channel estimation and measurements under the assumption of no hardware impairment. But the practical hardware suffer from hardware impairments like IQ gain imbalance, skew and phase noise. MIMO systems are very sensitive for the above impairments which  degrades the achievable capacity of the MIMO system. This paper presents an experimental real time study of indoor MIMO capacity measurement incorporating the hardware impairments. Algorithms are written in LABVIEW and implemented in SDR platform of National Instrument 6.6 GHz vector signal generator PXIe 5673 and vector signal analyzer PXIe 5663.
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Channel Measurement; Experimental Study; MIMO Transmitter Hardware Impairment; Least Square Estimate

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