Reconfigurable intelligent surface (RIS) has been viewed as a promising solution in constructing reconfigurable radio environment of the propagation channel and boosting received signal power by smartly coordinating passive elements’ phase shifts at RIS. Inspired this emerging technique, article focuses on joint beamforming design optimization for RIS-aided hybrid satellite-terrestrial relay ne...

For millimeter-wave (mm-wave) buffer-aided tandem networks consisting of relay nodes and multiple channels per hop, we consider two traffic allocation schemes, namely local allocation and global allocation, and investigate the end-to-end latency of a file transfer. We formulate the problem for generic multi-hop queuing systems and subsequently derive closed-form expressions of the end-to-end la...

In this paper, we consider a wireless relay-aided Orthogonal Frequency Division Multiple Access (OFDMA) network, where there are a Base Station (BS), multiple Relay Stations (RSs) and Mobile Stations (MSs). we assume that individual MS is already allocated to its serving sector which is served by BS directly or through RSs. To maximize the total sum of utility functions of average packet delays...

In this paper, an intelligent reflecting surface (IRS)-aided two-way decode-and-forward (DF) relay wireless network is considered, where two users exchange information via IRS and DF relay. To enhance the sum rate performance, three power allocation (PA) strategies are proposed. Firstly, a maximizing method based on successive convex approximation (Max-SR-SCA) proposed to jointly optimize PA fa...

In this study, we introduce a new two-way relay channel and obtain an inner bound and an outer bound for the discrete and memoryless multiple access relay channels with receiver-source feedback via two-way relay channel in which end nodes exchange signals by a relay node. And we extend these results to the Gaussian case. By numerical computing, we show that our inner bound is the same with o...

       Injuries to the posterolateral corner (PLC) comprise a significant portion of knee ligament injuries. A high index of suspicion is necessary when evaluating the injured knee to detect these sometimes occult injuries. Moreover, a thorough physical examination and a comprehensive review of radiographic studies are necessary to identify these injuries. In this sense, stress radiographs can ...