c 2017 The Korean Society of Neurogastroenterology and Motility J Neurogastroenterol Motil, Vol. 23 No. 3 July, 2017 www.jnmjournal.org TO THE EDITOR: Studies using the lipid laden macrophage index (LLAMI), first described by Colombo and Hallberg, have shown an unquestionable excess of lipid laden macrophages in the airways of patients with respiratory diseases. However, the diagnostic use of t...

This work does the statistical quality-of-service (QoS) analysis of a block-fading device-to-device (D2D) link in multi-tier cellular network that consists macro-BS ( $BS_{_{MC}}$ ) and micro-BS notation="LaTeX">$BS_{_{mC}}$<...

Performance Analysis of ARQ and Hybrid ARQ over Single-Hop, Dual-Hop, and Multibranch Dual-Hop Networks Amir Hadjtaieb During the last decade, relay networks have attracted a lot of interest due to their numerous benefits. The relaying technique allows extending the coverage zone of wireless networks and offers a higher reliability for communication systems. The performance of relay networks ca...

In mobile packet data and voice networks, a special coding scheme, known as the incremental redundancy hybrid ARQ (IR HARQ), achieves higher throughput efficiency than ordinary turbo codes by adapting its error correcting code redundancy to fluctuating channel conditions characteristic for this application. An IR HARQ protocol operates as follows. Initially, the information bits are encoded by ...

This paper deals with the performance evaluation and optimization of an efficient Hybrid Automatic Repeat Request (HARQ) scheme suitable for applications delivered over lossy multicast communication channels. In particular, differently from previously investigated strategies, this paper proposes a Modified HARQ scheme based on the Symbol Combining principle (MHARQ-SC) where multiple copies of a...

In this paper, we consider a three node relay network comprising a source, a relay, and a destination. The source transmits the message to the destination using hybrid automatic repeat request (HARQ) with incremental redundancy (IR). The relay overhears the transmitted message, amplifies it using a variable gain amplifier, and then forwards the message to the destination. This latter combines b...

Packet duplication (PD) with dual connectivity (DC) was newly introduced in the 5G New Radio (NR) specifications to meet stringent ultra reliable low latency communication (URLLC) requirements. PD technology uses duplicated packets packet data convergence protocol (PDCP) layer that are transmitted via two different access nodes (ANs) user equipment (UE) order enhance reliability performance. Ho...

For delay-tolerant data services, adaptive transmission with the modulation and coding scheme (MCS) adjusted according to the instantaneous channel condition can maximize the throughput. In time-varying channels, the performance degradation of adaptive transmission caused by delayed or inaccurate channel condition feedback can be mitigated with the use of hybrid automatic repeat request (HARQ)....

The IEEE 802.16 technology (WiMAX) is a promising technology for providing last-mile connectivity by radio link due to its high speed data rates, low cost of deployment, and large coverage area. However, the maximum number of channels defined in the current system may cause a potential bottleneck and limit the overall system capacity. The aim of this paper is to compare the impact on system per...