Abstract
In this paper, we investigate wireless-powered communication system (WPCS) with multiple frequency bands. When ambient RF signals can be used as an only energy source of wireless devices (WDs), a traditional signal-generator-based communication (SGC) might be demanding due to its high power consumption mainly because of RF-chain, so that backscatter communication (BC) has gained much attention recently. However, the bandwidth efficiency of BC is significantly limited, and thus BC is not always the best option for WPCSs. Thus, we analyze this trade-off by comparing their achievable capacity and show conditions in which the throughput of SGC is higher than BC when multiple frequency bands are available as an energy source and communication channel. Based on the analyses, we propose a hybrid approach with SGC and BC, which enables WDs to decide the best frequency band and communication method in a distributed manner.
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