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Comparison of Phantoms in a Browsing Position by a NLOS Outdoor MIMO Propagation Test

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CMSY8 J. Ø. Nielsen et al: On Antenna Design Objectives and the Channel Capacity of MIMO Handsets Page 1 of 11 On Antenna Design Objectives and the Channel Capacity of MIMO Handsets Jesper Ødum Nielsen, Boyan Yanakiev, Samantha Caporal Del Barrio, Gert Frølund Pedersen Abstract—The branch correlation coefficient (BCC), the branch power ratio (BPR), and the total mean power (TMP) are often used to characterize the mobile multiple-input multiple- output (MIMO) channel. This work investigates to which degree these parameters are useful for maximizing the channel capacity of MIMO handheld devices used in data mode. A statistical point of view is applied, using about 2,800 outdoor to indoor channel sounder measurements obtained with combinations of 10 different handsets, 4-8 test users and a variety of different use cases (UCs). All measurements were made in an urban environment in a setup with two different base stations (BSs) and with the users inside a single building. For each measurement combination, the mean capacity (MC) and associated values of BCC, BPR, and TMP are obtained. From the data it is found that the MC is only weakly correlated with both the BCC and the BPR, while the MC is highly correlated with the TMP. Index Terms—MIMO channels, propagation measurements, channel capacity, branch power ratio, branch correlation, mean effective gain, user-interaction, dual-band propagation, optical link I. INTRODUCTION The MIMO transmission technology is well known for its potential to allow for increased transmission capacity com- pared to that of traditional single-input single-output (SISO) systems [1]. MIMO technology has long been used in e.g., 802.11n wireless local area networks (WLANs) [2] and, more recently, MIMO is an important part of the evolving long-term evolution (LTE) systems [3]. Where WLAN devices in the early days were less likely to be in close contact to the device user, e.g., in laptop usage, typical use of handsets or smartphones, commonly referr

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