  In this paper, we quantify performance gain achieved if SISO system is
replaced with 4x4 MIMO in WLAN setting compatible with IEEE 802.11n standard.
We compare throughput and power savings in MIMO by taking field measurements at
various indoor locations. Measurements are validated with simulations that
include different IEEE TGn channel models. For comparison between MIMO and
SISO, we select the Modulation and Coding Scheme (MCS) which yields the highest
throughput subject to QoS constraints (PER <10%). We show that throughput gain
of 2.5x-3x and power saving of 5-15 dB are achievable in 4x4 MIMO system.
