Abstract-Far-field wireless power transfer (WPT) is a promising technique to resolve the painstaking power-charging problem inherent in various wireless terminals. This paper investigates the power transfer efficiency of the WPT segment in future communication systems in support of simultaneous power and data transfer, by means of analytically computing the time-average output direct current (DC) power at user equipments (UEs). In order to investigate the effect of channel variety among UEs on the average output DC power, different policies for the scheduling of the power transfer among the users are implemented and compared in two scenarios: homogeneous, whereby users are symmetric and experience similar path loss, and heterogeneous, whereby users are asymmetric and exhibit different path losses. Specifically, if opportunistic scheduling is performed among N symmetric/asymmetric UEs, the power scaling laws are attained by using extreme value theory, and reveal that the gain in power transfer efficiency is ln N if UEs are symmetric whereas the gain is N if UEs are asymmetric, compared with that of conventional round-robin scheduling. Thus, the channel variety among UEs inherent to the wireless environment can be exploited by opportunistic scheduling to significantly improve the power transfer efficiency when designing future wireless communication systems in support of simultaneous power and data transfer. Index Terms-Extreme value theory, finite spatial coverage, multi-user scheduling, power transfer efficiency, simultaneous power and data receiver, wireless power transfer (WPT).
In REF , the power transfer efficiency of a multiuser wireless energy transfer system was investigated.
On the Efficiency of Far-Field Wireless Power Transfer
IEEE Transactions on Signal Processing
IEEE Transactions on Signal Processing
Mathematics Computer Science