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“…If , where denotes the needed power by the circuit for BC, has the ability to convey its information to D via backscattering S RF signals. If is selected to reflect the signal, the effective received SNR to calculate the achievable rate at D can be written as where is the backscatter efficiency which denotes the effective RF signal reflected by the tag, and denotes the AWGN power at D. The adopted modulation scheme by BC will produce a gap compared to the Shannon capacity, we use to denote this gap in () [4].…”
Section: System Modelmentioning
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“…If , where denotes the needed power by the circuit for BC, has the ability to convey its information to D via backscattering S RF signals. If is selected to reflect the signal, the effective received SNR to calculate the achievable rate at D can be written as where is the backscatter efficiency which denotes the effective RF signal reflected by the tag, and denotes the AWGN power at D. The adopted modulation scheme by BC will produce a gap compared to the Shannon capacity, we use to denote this gap in () [4].…”
Section: System Modelmentioning
“…where η is the backscatter efficiency which denotes the effective RF signal reflected by the tag, and σ 2 denotes the AWGN power at D. The adopted modulation scheme by BC will produce a gap compared to the Shannon capacity, we use to denote this gap in (2) [4]. Observing (2), it can be easily found that the higher β i , the lower received SNR at D. Thus, for T i , the value of the optimal β * i can be obtained by setting the output power just equal to the consumed power, that is, P oi = P c .…”
mentioning
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“…In [10], to achieve optimal ergodic capacity in the spectrum sharing system, the reection coecient of BD and the transmit power of the primary trans-mission were jointly optimized, while the BD's interference to the primary receiver is treated to be less than a predened threshold. In [11], the cooperative backscatter system with a dedicated source node is studied to split each transmission into two time slots, and such system adopted the harvest-then-transmit (HTT) protocol. Further, by optimizing the time durations of two time Slots and the reection coecient, the authors examined maximized achieved rate.…”
Section: Introductionmentioning
“…Due to the extra co-channel interference caused by the backscattered signals, the degraded performance can be reported in the above works [913]. Moreover, the backscatterassisted systems that considers how to select the appropriate working mode between the active radio or passive radio, i.e., using batteries or BC in [11,14] in terms of the outage performance and symbol error rate, respectively. Dierent from [1013], reference [15] studied a decode-and-forward (DF) enabled oneway cooperative ambient backscatter communication (CABC) system.…”
Section: Introductionmentioning