Analog Multiple-Input Multiple-Output Radio-over-Copper (A-MIMO-RoC) is an effective allanalog FrontHaul (FH) architecture that exploits any pre-existing Local Area Network (LAN) cabling infrastructure of buildings to distribute Radio-Frequency (RF) signals indoors. A-MIMO-RoC, by leveraging a fully analog implementation, completely avoids any dedicated digital interface by using a transparent end-to-end system, with consequent latency, bandwidth and cost benefits. Usually, LAN cables are exploited mainly in the low-frequency spectrum portion, mostly due to the moderate cable attenuation and crosstalk among twisted-pairs. Unlike current systems based on LAN cables, the key feature of the proposed platform is to exploit more efficiently the huge bandwidth capability offered by LAN cables, that contain 4 twisted-pairs reaching up to 500 MHz bandwidth/pair when the length is below 100 m. Several works proposed numerical simulations that assert the feasibility of employing LAN cables for indoor FH applications up to several hundreds of MHz, but an A-MIMO-RoC experimental evaluation is still missing. Here, we present some preliminary results obtained with an A-MIMO-RoC prototype made by low-cost all-analog/all-passive devices along the signal path. This setup demonstrates experimentally the feasibility of the proposed analog relaying of MIMO RF signals over LAN cables up to 400 MHz, thus enabling an efficient exploitation of the LAN cables transport capabilities for 5G indoor applications. A. Matera, M. Donati and U. Spagnolini are with DEIB, Politecnico di Milano
A Smart Antenna base station (SA-BTS) for GSM/DCS system has been designed to quantify the advantages of adaptive array processing. The architecture and the hardware platform have been chosen to have a flexible system for testing the performances of different space-time receivers both in laboratory and in field. The improved performance of adaptive antenna systems with respect to standard BTS are confirmed by tests carried out for different adaptive array algorithms.
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