Maximum Transmission Rate of PSR/TSR Protocols in Wireless Energy Harvesting DF-Based Relay Networks

Abstract

In this paper, we consider the power splitting relaying (PSR) and time switching relaying (TSR) protocols for decode-and-forward (DF)-based relay networks consisting of a source, a relay, and a destination. For the networks, the relay is assumed to have a rechargeable battery with a certain amount of remaining energy for energy harvesting through the received signal transmitted from the source. Specifically, for the PSR protocol with and without the direct-path, we present the outage probability expression with a given power splitting coefficient, and we obtain the optimum power splitting coefficient to maximize the transmission rate and derive its transmission rate and outage probability, where the optimum coefficient depends on channel conditions and remaining energy. For the TSR protocol with and without the direct-path, we present the outage probability expression with a given time switching coefficient, and we obtain the optimum time switching coefficient to maximize the transmission rate and derive its transmission rate, where the optimum coefficient also depends on channel conditions and remaining energy.Index Terms-Decode-and-forward (DF)-based relay networks, energy harvesting, outage probability, power splitting relaying (PSR), time switching relaying (TSR), transmission rate, wireless energy transfer. 0733-8716 (c)

Rate Optimization of Two-Way Relaying with Wireless Information and Power Transfer

“…These splitting methods are investigated in cooperative networks with one-way relaying (OWR) protocols [11,[16][17][18][19]24,26] and with two-way relaying (TWR) protocols [12,13,15,23,25]. Here, amplify-and-forward (AF) relays are adopted in [11][12][13]15,24] for a lower complexity with the simple relay operation amplifying the received signal without information decoding, while decode-and-forward (DF) relays are adopted in [16][17][18][19]23,25] for a better performance with the complicated relay operation regenerating the relay signal after decoding the received signal.…”

“…To be more specific, for the OWR protocol, the performance of the PS-SWIPT and TS-SWIPT methods is studied with an AF relay in terms of the outage probability and ergodic capacity [11]; with a DF relay in terms of the ergodic capacity, outage capacity [16], maximum achievable rate [17], and outage probability [26]. The performance of the PS-SWIPT for the OWR protocol is also studied with a full-duplex DF relay [19] and with the AF relay when the direct link is available [24].…”

“…In particular, various relaying protocols have been rebuilt to support energy harvesting devices in cooperative networks [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26], where relays can be categorized into either energy harvesting nodes or energy transmission nodes. Energy harvesting relays are as low in complexity as communicating devices and harvest the energy in helping the data exchange of the devices in general [11][12][13][14][15][16][17][18][19][23][24][25][26].…”

“…Energy harvesting relays are as low in complexity as communicating devices and harvest the energy in helping the data exchange of the devices in general [11][12][13][14][15][16][17][18][19][23][24][25][26]. On the other hand, energy transmission relays are as highly complex as base stations so that the relays transfer the power and information to the communicating devices [20][21][22]; the relays even employ massive antennas to leverage the efficiency in the power and information transfer at a high cost in implementation [27,28].…”

Exploiting Direct Links in Multiuser Multirelay SWIPT Cooperative Networks With Opportunistic Scheduling

“…Considering a similar single relay network but adopting a decode-andforward (DF) relaying strategy, maximum transmission rates of the TS-based and PS-based relaying protocols were analyzed in [16] for the cases with and without direct links. In [17], the authors studied SWIPT in multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) relaying system.…”