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D–BLAST MIMO Perfomance Analysis over SDR–USRP

Abstract:

This paper describes the implementation of the tech-nique based on D–BLAST spatial multiplexing on Software Defined Radio (SDR) equipment. Specifi-cally, the aim is to use Universal Software Peripheral Radio (USRP) Ettus Research x310 devices, to tackle the problem of spatial diversity of the MIMO Alamouti scheme which it is not able to increase the number of antennas of the transmitter with respect to the receiver. The simulation scenario was an indoor environment using LabVIEW Communications Software graphical programming tools, achieving a more robust coding design based on the nonlinearity of matrix equations, thus mitigating through the redun-dancy of information the effects of the interference due to the increase of the antennas of the transmitter. The experimental results evaluated were bit error rate (BER) and symbol error rate (SER) to determine the effectiveness of spatial diversity. The gain achieved was around 10dB and 7dB in MIMO 2×2 and MIMO 3×2, respectively, using the symmetric D–BLAST technique.