Colocated and Distributed Switch-and-Stay Combining: Optimality Under Switching Rate Constraints

Full-duplex distributed switch-and-stay networks with wireless energy harvesting: design and outage analysis

“…As same as in [15], we also consider that self-interference link as beneficial link because the loopback energy can be recycled by the relay and the relay harvests and uses this energy for information transmission in addition to harvested energy from the source signal. For simplicity, in this paper, we assume that there are no interference signals from the transmitting antenna of relay R 1 /R 2 to the receiving antenna of relay R 2 /R 1 since only one relay is active when using DSSC technique, so we do not need to consider the link between two relays [18][19][20]22]. We further assume that the relay of the inactive link will keep idle, i.e., no energy is harvested.…”

“…The end-to-end SNR for HD utilizing AF is expressed in (20). Substituting (52) and (54) into (20), we obtain γ AF e2e,R 1 which is shown as follows.…”

“…Motivated by this, in this paper, we utilize distributed switch-and-stay combining (DSSC) technique at the destination for the case where two relaying terminals are used to improve the performance of full-duplex relaying with WIPT networks and to reduce the implementation complexity at the destination. Our system may be the case in practical scenarios where the destination may not support complex functions, e.g., employing a diversity combiner due to a tiny hardware constraint wireless node which has limited battery power and signal processing capability or the direct link between the source and destination does not exist due to deep shadowing [18][19][20]22]. The term "swich-and-stay combining " is the efficient diversity-exploiting technique that switches between signals from two branches based on their instantaneous received signal-to-noise ratio (SNR).…”

Multiple Antenna Selection Schemes with a RF Reconfigurable Power Combiner

“…Hence, the number of estimations in switched combining is less than that in SC since estimating all diversity antennas is not necessary for switched combining. Several schemes of switched combining such as switch-and-stay combining (SSC), switch-and-examine combining (SEC), and switch-and-examine combining with post-examining selection (SECps) have been presented [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

“…Dual-branch SSC has been studied in [2][3][4][5][6][7][8][9]. When the SNR of the connected branch drops below a predetermined threshold, the receiver switches to the other branch regardless of its quality.…”