Pedestrians effects on indoor MIMO-OFDM channel capacity

Authors:
Jishu Das Gupta;Karla Ziri Castroc
Affiliations:
Telecommunication Engineering, School of Engineering Systems, Queensland University of Technology, Brisbane, Australia;Telecommunication Engineering, School of Engineering Systems, Queensland University of Technology, Brisbane, Australia
Venue:
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Year:
2009

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Abstract

Temporal variations caused by pedestrian movement can significantly affect the channel capacity of indoor MIMO-OFDM wireless systems. This paper compares systematic measurements of MIMO-OFDM channel capacity in presence of pedestrians with predicted MIMO-OFDM channel capacity values using geometric optics-based ray tracing techniques. Capacity results are presented for a single room environment using 5.2 GHz with 2×2, 3×3 and 4×4 arrays as well as a 2.45 GHz narrowband 8×8 MIMO array. The analysis shows an increase of up to 2 b/s/Hz on instant channel capacity with up to 3 pedestrians. There is an increase of up to 1 b/s/Hz in the average capacity of the 4×4 MIMO-OFDM channel when the number of pedestrians goes from 1 to 3. Additionally, an increment of up to 2.5 b/s/Hz in MIMO-OFDM channel capacity was measured for a 4×4 array compared to a 2×2 array in presence of pedestrians. Channel capacity values derived from this analysis are important in terms of understanding the limitations and possibilities for MIMO-OFDM systems in indoor populated environments.