Indoor w ' r h locat networks (my4n3 dewlopmetti in the millimeire band gives new perspeclives, which 5re very promising in lpnns of announced &a rate and o f l i services. N d e l e s s strong free space aaenuation as well as pieces of furniture and wall atrenuations result in drmlt propagation conditions A French research project RNRT COMMINDOR) has been set up io study and h i g n new high &fa rote (ISSMbiUs) radio Eommmkution SrJiernS at 60 GHz in an indoor mviromnent. SIRADEL takes par! in this project by modeuing the propagetkm phenomenon thanks to a ray-iracing io01 associated to the Uniform Theoq of Di~raction (UTD). Simukaiwns are then compared lo meusurements r&ed in thefiatne of titis project by the LCST Lab of INSA Rentus The good behaviour of the propagatwn model i s and# for LOS curd NLOS sirwrianr

Massive MIMO systems serve multiple users in the same time-frequency resource by utilizing large antenna arrays. A uniform linear array (ULA) containing 128 antenna elements is considered in an urban North American city environment with multiple user channels. The simulations are conducted with a raybased tool with the latest enhancements of outdoor-to-indoor (O2I) channel prediction capabilities. Most massive MIMO research often uses theoretical models which are based on various assumptions which cannot accurately predict the channel performance. In this paper, simulations are conducted to characterize and evaluate massive MIMO channels in O2I scenarios. A comparison is drawn with regard to line-of-sight (LoS) channels using the singular value spread (SVS) analysis for users located in a same building. It is concluded that the channel dispersion caused by the various multi-paths created at the O2I interface contributes to better channel performance in smaller antenna arrays which is only limited by the path-loss. For larger arrays, there is a saturation of the O2I SVS contribution.

Spectrum above 90 GHz is a promising investigation domain to offer future wireless networks with performance beyond IMT 2020 such as 100+ Gbit/s data rate or sub-ms latency. In particular, the huge available bandwidth can serve the backhaul transport network in the perspective of future ultra-dense deployments, and massive front-haul data streams. This paper investigates the feasibility and characteristics of the in-street sub-THz mesh backhauling. The study relies on the highly realistic simulation of the physical layer performance, based on detailed geographical representation, ray-based propagation modelling, RF phase noise impairment, and a new modulation scheme robust to phase noise. The achievable throughput is studied, and it is shown that each link of a dense mesh backhaul network can reliably deliver several Gbit/s per 1-GHz carrier bandwidth. The multi-path diversity is assessed, as well as the impact of rainfall and phase noise level.