Save and Transmit Scheme for Energy Harvesting MIMO Systems with TAS/MRC

Abstract

In this paper, we propose and analyze a wirelesstransmitter, for multiple-input multiple-output (MIMO) systems,that relies exclusively on energy harvesting. We consider wirelesstransceivers where the transmitter harvests the total requiredenergy from its environment through various sources. We assumethat both transmitter and receiver are equipped with multipleantennas. At the transmitter, a single transmit antenna thatmaximizes the signal-to-noise ratio (SNR) at the receiver isselected for transmission. The remaining antennas are used forenergy harvesting. At the receiver side, maximal-ratio com-bining (MRC) is used. Furthermore, we assume that all theharvested power is used to power the transmitter immediately.The performance of the proposed scheme is analyzed in terms ofoutage probability (OP), symbol error rate (SER) and channelcapacity. The harvested energy comes from random sourcesand is considered as a random variable. Assuming that theharvested power follows a gamma distribution and the MIMOchannel is a Rayleigh flat fading process, we derive a closed-form expressions for the exact cumulative distribution function(CDF) and probability density function (PDF) of the SNR. Basedon this, we analyze the performance of the proposed energyharvesting scheme. The obtained analytical results are validatedby comparing them with the results of Monte-Carlo simulations.

Outage analysis for NOMA‐based energy harvesting relay network with imperfect CSI and transmit antenna selection

“…The closed form expression of outage probability of mth signal is given by (see (25)) , at the bottom of next page.…”

“…The transmit antenna selection (TAS) technique is also effective for RF-based energy harvesting network to enhance the system performance. TAS is a scheme to transmit data by a single antenna having the strongest channel between source and relay [25,26]. In [25], the authors proposed a TAS/MRC (maximal ratio combining) scheme in a MIMO-based energy harvesting system.…”

“…TAS is a scheme to transmit data by a single antenna having the strongest channel between source and relay [25,26]. In [25], the authors proposed a TAS/MRC (maximal ratio combining) scheme in a MIMO-based energy harvesting system. Due to delay in feedback from relay to source, the outdated CSI is used to select a relay.…”