Impact of Antennas and Correlated Propagation Channel on BD Capacity Gain for 802.11ac Multi-User MIMO in Home Networks

Khouloud Issiali (1, 2) , Valéry Guillet (1) , Ghais El Zein (2) , Gheorghe I. Zaharia (2)

1 Orange Labs - Orange Labs [Belfort]
2 IETR - Institut d'Électronique et des Technologies du numéRique

— In this paper, we study the impact of antennas and propagation channel on the block diagonalization (BD) capacity gain for 802.11ac MultiUser MIMO (MU-MIMO) in Home Networks. A correlated channel model is examined. The effect of the number of the transmit antennas, their spacing, and SNR is explored. It is shown that only a small increase of the number of transmit antennas over the total number of spatial streams increases the MU-MIMO capacity gain over SU-MIMO considerably. For example, a gain of 45% is achieved for a 20 dB SNR with 4 spatial streams and 6 transmit antennas. Additionally, the half wavelength antenna spacing is sufficient to take advantage of BD gain and to keep a transmit antenna with compact size. Based on simulations, we reveal the importance of a new channel correlation parameter to explain MU-MIMO capacity gain.

Mots clés: MU-MIMO; IEEE 80211ac; home networks; channel capacity; channel models

Domaines: Electronique

Khouloud Issiali, Valéry Guillet, Ghais El Zein, Gheorghe I. Zaharia. Impact of Antennas and Correlated Propagation Channel on BD Capacity Gain for 802.11ac Multi-User MIMO in Home Networks. Revue Méditerranéenne des Télécommunications=Mediterranean Telecommunication Journal, 2015, 5 (2), pp.59-65. ⟨hal-01164509⟩