Wireless Three-hop Relay Environment with Line-of-Sight: Investigation and Performance Analysis

Abstract

Lately, the investigation of multi-hop relays is increased in both, academia and engineering practice. Multi-hop relay is introduced to enable data transmission between base station and mobile user dividing great distance into two or more segments to improve link quality. This improvement is specially expressed in environments under deep fading and shadow, where coverage is significantly increased using multi-hop relays. Here, wireless three-hop relay environment with line-of-sight was observed. Output signal from such system is defined as a product of three arbitrary, independent, but not necessarily identically distributed Rician random variables (RVs). For such system, some important performance of the first and second order were analyzed and graphically presented. The impact of Rician factor and signal powers on performance quantities was shown. Derived and displayed first order performance are: probability density function (PDF), cumulative distribution function (CDF), outage probability (Pout), moments, amount of fading (AoF) and channel capacity. Then, the following second order characteristics of wireless three-hop relay communication system working in Rician multipath fading environment were covered: level crossing rate (LCR) and average fade duration (AFD). These results have big application in wireless relay communications with a pronounced line-of-sight, where Rician model is used to describe fading.

Model-Driven Approach to Fading-Aware Wireless Network Planning Leveraging Multiobjective Optimization and Deep Learning

“…It is important to mention that moments are also analyzed in the available literature. In [44,71,72], multihop relay is introduced to enable data transmission between base station and mobile users in the risk environments. It is obtained by dividing the long distance into more segments to improve link quality in environments under deep fading and shadowing.…”

“…e coverage is then significantly increased, and transmission is made more reliable and efficient, which is of great importance. In [71], the wireless three-hop relay system with line of sight was analyzed, and different performance of the first and second order was derived in closed forms, including moments. A similar relay system scenario, but with two sections operating over Nakagami-m fading channel in the presence of CCI subjected to Rician fading, was observed in [72].…”