{"id":65,"date":"2019-06-20T11:51:42","date_gmt":"2019-06-20T09:51:42","guid":{"rendered":"https:\/\/project.inria.fr\/m5hstia\/?page_id=65"},"modified":"2019-10-31T10:12:05","modified_gmt":"2019-10-31T09:12:05","slug":"results","status":"publish","type":"page","link":"https:\/\/project.inria.fr\/m5hstia\/results\/","title":{"rendered":"Results and future works"},"content":{"rendered":"

<\/p>\n

Main project results<\/strong><\/h3>\n

At the beginning of the project, there were a lot of theoretical analysis concerning massive MIMO for mmWave. The larger the number of transmit antennas, the greater the multiple antenna\u00a0gain and the spatial multi-user multiplexing gains especially when carrying out spatial division multiplexing\u00a0 access (SDMA) through digital precoding also denoted as digital beamforming. Most of the theoretical studies therefore assumed as many RF chains as the number of antennas.<\/p>\n

On the one hand, the increase in frequency, which has since been confirmed by the allocation of new bands in mmWave for 5G, was intended to make\u00a0 possible\u00a0 the use of much wider bands than the previous ones (up to 2 GHz). <\/span>On the other hand, the miniaturization of antennas at these frequencies was supposed to allow a considerable increase in the number of antennas or radiating elements for MIMO systems.<\/span><\/p>\n

Nevertheless, the increase in the number of antennas envisaged\u00a0 for<\/span> massive-MIMO systems and the rise in mmWave\u00a0 with its corollary of antennas of <\/span>very small size, pose many problems of RF integration (compact circuits, consumption, <\/span>OL synchronization faults, loss compensation …) we dealt with in\u00a0 the M5<\/sup>HESTIA project. <\/span><\/p>\n

As described in the initial proposal<\/a>, the 2 projets <\/span>were carried out in parallel. b<>com M5 focused on the techniques of beamsteering in very large bandwidth in FDD mode whilst M5<\/sup>HESTIA\u00a0 focused on TDD modes. List of publications do not include b<>com results.The b<>com plateform integrated antennas developped in the framework of M5<\/sup>HESTIA .
\n<\/span><\/p>\n

In <\/span>M5<\/sup>HESTIA, we studied new solutions based on hybrid systems<\/strong> requiring less RF chains than the number of radiating elements and optimized then to reach low complexity systems. We designed new antennas and RF architectures<\/strong> allowing very high gains as required for channel sounding in massive MIMO and new antennas for digital beamsteering integrated in the IRT b<>com platform. <\/strong>First measurements in both azimuth and elevation\u00a0 will begin very soon and <\/span>additional measurement campaigns are planned <\/span>in the framework of the CominLabs mmWSounder project. Channel modelling for mobility scenario<\/strong> including tracking has been proposed.
\n<\/span><\/p>\n

How the results obtained by M5<\/sup>HESTIA are positioned in relation to the results of the literature is detailed in\u00a0 the part dedicated to the today’s state of the art<\/a>.
\n<\/span><\/p>\n

The results have been published in 1 accepted journal paper and 11 conference papers. 3 other journal papers have been yet submitted and are under review. Moreover, a session in a workshop<\/a> commonly organized by M5<\/sup>HESTIA members and Orange, will held on the 8th November 2019 to promote M5HESTIA results.<\/p>\n

Future work <\/strong><\/h3>\n

This work will be directly exploited in the project mmWSounder in the framework of \u201cAction \u2013Innovation\u201d of Cominlabs where the objective is to integrate the developped antenna module in a full and dynamic channel sounder<\/strong> based on Software Defined Radio equipment. All partners will be involved in this project to integrate antennas provided by M5<\/sup>HESTIA into a dynamic channel sounder, to carry out\u00a0 additionnal channel measurements, to go on improving channel modelling and check theoretical simulation results with “measured channels”.<\/p>\n

Future works could also include an\u00a0 easy extension\u00a0 to other mmWave bandwidths (as 28GHz). Mobility scenarios could easily be studied thanks to the proposed model. New hybrid systems antenna should be developped.<\/p>\n

Main important results per Workpackage
\n<\/strong><\/h3>\n
WP2: Antenna design and RF architecture<\/a><\/h5>\n