Prototyping of Complex Wireless Systems is very much necessary for understanding the implementation tradeoffs and system behavior. Realizing such prototypes to meet standard specifications have several challenges. The 802.11n WLAN standard implements MIMO-OFDM in its physical layer to support high data rate, better link quality and improved range compared to 802.11 a/b/g. In prototype modules, it is essential to validate the transmitter with standard analyzer, receiver with standard generator before finalizing the design. A wireless prototype has two main parts in general from hardware perspective. One is baseband processor and other is integrated RF Transceiver. Realizing the digital data interface between baseband processor and integrated RF transceiver is one of the important challenge especially for MIMO transmissions. In this paper, we are providing the implementation details of data interface path on FPGA for transmitting MIMO IQ samples through AD9361. The implementation is tested on custom design baseband hardware card. Matlab generated 802.11n based 2 × 2 MIMO-OFDM IQ samples are transmitted and quality in terms of Error Vector Magnitude (EVM) has been verified with R&S signal analyzer for different different Modulation and Coding Schemes (MCS).
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