Hi everyone, I am Moritz Luca Schmid, a graduate student from Karlsruhe Institute of Technology (KIT). Since 2016 I am in touch with GNU Radio, mainly developing for the Communications Engineering Lab (CEL) in Karlsruhe, where I am working as an assistant researcher. In 2017, I successfully participated in GSoC'17 with GNU Radio, building a DAB/DAB+ Transceiver application[1][2], now also know as DABstep ;) After GSoC'17, I have continued working on the DAB+ project, improving the code and introducing new features. As some examples, I added RTL-SDR devices as a possible signal source and currently I am implementing dynamic label and Media Object Transfer (MOT) support. I also rewrote the existing OFDM PHY layer and developed a more efficient and robust method for synchronization in my Bachelor thesis in fall 2017.
I am very excited about the idea of bringing a MIMO capability to the GNU Radio project. I read about the suggestion of a MIMO transceiver at the list of old ideas for GSOC, proposing to implement an OOT module (gr-mimo) that includes the basic encoding and decoding algorithms and therefore enriching GNU Radio with another basic telecommunication feature. To do so, it proposes an OFDM based phsical layer and the realization of MRC decoding and beamforming. I like the idea of combining the proposed MIMO capability directly with OFDM. The combination of frequency and space diversity has shown very promising performance results and MIMO-OFDM is considered in a number of developing wireless standards. MIMO-OFDM in GR would therefore be a very valuable basis for all those, who are interested in these new techniques but don't want to build a whole communication system from scratch. The GNU Radio core module gr-digital already contains a solid OFDM implementation, including a complete transmitter and receiver with synchronization. (Actually I found multiple implementations (ofdm_receiver, ofdm_txrx, ofdm_mod/demod) including OFDM (de)modulation and synchronization (mainly with Schmidl & Cox but also other sync approaches). Some of them additionally include the digital (de)modulation/ symbol (de)mapping.) In order to reuse this existing code for the MIMO idea, I propose the inclusion of a (of course optional) MIMO capability in gr-digital's OFDM transceiver. In GRC view, I am thinking of an additional parameter for the hierarchical blocks of the OFDM transmitter and receiver in form of a drop down menu, stating SISO transmission mode as default option, but also listing some MIMO possibilities. Talking of specific MIMO capabilities, I would mainly focus on the implementation of the most popular algorithms, e.g. an Alamouti 2xN and V-BLAST. Together with a loopback and over the air example (I would propose USRP B210s for the start) and a cool demo, this could be an attractive feature for many MIMO interested people. Together with a unified interface and extensive qa tests, the MIMO feature fits well into gr-digital, instead of a separated OOT module. I know, that I am very late in proposing this idea for GSoC. Please let me know, what you think of this approach for a possible GSoC'18 project and share your ideas and comments. Best Luca [1] GSoC'17 blog about DAB/DAB+ Transceiver application <https://dabtransceiver.wordpress.com/> [2] gr-dab github repository <https://github.com/kit-cel/gr-dab/tree/working_branch>
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