In this paper authors present a novel implementation of 2 £ 2 MIMO system with Orthogonal Frequency-Division Multiplexing (OFDM) modulation using GNU Radio with USRP2. GNU Radio is a library designed for signal processing, which allows users to create streams of thesignal processing by combining ready components. In addition with software deflned radio it ofiers testing of theoretical models under real-world conditions. Model of transmitter was created by using algorithm and methods which are implemented in GNU Radio SISO OFDM modulator. Authors extended them by Alamouti SFBC coder, because it is very efiective and also simple in implementation. The Alamouti SFBC is a rate-1 code. It takes two time-slots to transmit two symbols. The receiver decoding is provided by determining channel estimation matrix and maximum-likelihood detector. Experimental results of MIMO link performance are also presented.
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