Abstract
In this paper, we consider the precoding design and power allocation problem for multi-user multiple-input multiple-output (MU-MIMO) wireless ad hoc networks. In the first timeslot, the source node (SN) transmits energy and information to a relay node (RN) simultaneously within the simultaneous wireless information and power transfer (SWIPT) framework. Then, in the second timeslot, based on the decoder and the forwarding (DF) protocol, after reassembling the received signal and its own signal, the RN forwards the information to the main user (U1) and simultaneously sends its own information to the secondary user (U2). In this paper, when the transmission rate of the U1 is restricted, the precoding, beamforming, and power splitting (PS) transmission ratio are jointly considered to maximize the transmission rate of U2. To maximize the system rate, we design an optimal beamforming matrix and solve the optimization problem by semi-definite relaxation (SDR), considering the high complexity of implementing the optimal solution. Two sub-optimal precoding programs are also discussed: singular value decomposition and block diagonalization. Finally, the performance of the optimization and sub-optimization schemes are compared using a simulation.
Highlights
Energy harvesting (EH) has received widespread attention as a promising technology capable of overcoming the problem of energy shortages in wireless communication networks [1].Many energy harvesting models have been proposed in [2,3]
One key issue in implementing simultaneous wireless information and power transfer (SWIPT) is the practical limitation that existing energy harvesting circuits cannot be used to decode and harvest the radio frequency (RF) signals concurrently [11], to solve this problem, power splitting (PS) designs have been proposed for SWIPT, with PS, the received signal is split into two parts, with one part used for information decoding (ID)
Suppose that source node (SN), relay node (RN), and U1 lie on a straight line and that the SN and U1 are equidistant from the RN
Summary
Energy harvesting (EH) has received widespread attention as a promising technology capable of overcoming the problem of energy shortages in wireless communication networks [1]. EH can solve the problem of energy shortages in wireless networks, when numerous devices are connected to the network, the available spectrum will be seriously inadequate, signal coverage is a problem in remote areas These problems are expected to be solved using MIMO technology [13], which can effectively increase data throughput and extend system transmission distance without requiring additional bandwidth or increasing the total transmission power consumption [14]. For stream control), using a precoding design and power allocation in MU-MIMO ad hoc networks to improve throughput has not been considered in previous works. Using a SWIPT MIMO strategy with relays can effectively improve the transmission rate, and the communication quality is determined by the RF energy receiver structure and the precoding performance.
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