Jishu Das Gupta

A Systematic Study of MIMO-OFDM Broadband Channels in Populated Indoor Environment

Abstract This paper presents a systematic study of input and multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems behavior in an indoor environment in the presence of deterministic and random human movement between transmitter and receiver array. The in-house built MIMO-OFDM packet transmission demonstrator, equipped with four transmitters and four receivers, has been utilized to perform channel measurements at 5.2 GHz. Measurements have been performed using 0–3 pedestrians with different antenna arrays (2 × 2, 3 × 3 and 4 × 4). Regular significant temporal variation has been observed for random scenarios compared to the deterministic scenarios. An incremental trend in average channel capacity for both deterministic and random pedestrian movements has been observed as a function of the number of the pedestrian and antennas. The 90% dynamic range analysis also reserved the incremental affinity with the increasing number of pedestrian and antenna combinations.

Variations in MIMO-OFDM channel capacity due to random human movement in an indoor environment

Channel measurements and simulations have been carried out to observe the effects of pedestrian movement on multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) channel capacity. An in-house built MIMO-OFDM packet transmission demonstrator equipped with four transmitters and four receivers has been utilized to perform channel measurements at 5.2 GHz. Variations in the channel capacity dynamic range have been analysed for 1 to 10 pedestrians and different antenna arrays (2×2, 3×3 and 4 × 4). Results show a predicted 5.5 bits/s/Hz and a measured 1.5 bits/s/Hz increment in the capacity dynamic range with the number of pedestrian and the number of antennas in the transmitter and receiver array.