This study presents a full-duplex Radio-over-Fiber (RoF) system providing the users' wireless access with a bit rate of 10 Gbps over 40 GHz radio carrier. This system can be used in a centralized radio access network (C-RAN) architecture because we provide a fully analog front haul link between central station and base station. We can consider it as infrastructure between remote radio heads (RR...

A cognitive radio sensor network (CRSN) is a wireless sensor network in which sensor nodes are equipped with cognitive radio. CRSNs benefit from cognitive radio capabilities such as dynamic spectrum access and transmission parameters reconfigurability; but cognitive radio also brings additional challenges and leads to higher energy consumption. Motivated to improve the energy efficiency in CRSN...

The effect of spectrum sensing errors on the performance of orthogonal frequency division multiplexing based cognitive radio transmission can be evaluated by deriving the expression for the average bit error rate. This depends on various parameters like transmission and spectrum sensing parameters. Here, we consider the case with adding a carrier frequency offset. The spectrum sensing errors of...

1. INTRODUCTION Public Access Mobile Radio systems (PAMR) using trunking technology allow more efficient use of the frequency spectrum, as all the users of the system jointly use a common pool of channels. This counteracts one of the limiting factors on the growth of conventional Private Mobile Radio systems (PMR), frequency congestion [1]. Moreover the public trunked network offers the user ma...

a r t i c l e i n f o Keywords: Heterogeneous wireless standards Multi-radio architecture LTE eHRPD Handover With the availability of various heterogeneous radio access technology standards, how to support multiple heterogeneous radio interfaces in a single device and provide seamless mobility between them is one of key issues in the design and implementation of modern multi-radio mobile device...

Wireless communications is one of the fastest media used worldwide today. However the wireless signals suffer from severe loss along the transmission as well as atmospheric attenuation. This paper proposes a solution to overcome this problem by using low-attenuation, electromagnetic interference free optical fiber. This can be achieved by using Radio Over Fiber (ROF) which is an integration of ...

1. Introduction The invention of radio, one of the most important inventions of the 20 th century is attributed to Guglielmo Marconi of Italy. Though it is disputed whether Nikola Tesla's patent on radio precedes that of Marconi, it is well-known that the first demonstration of radio transmission over several thousand miles was done by Marconi in the year 1901. There have been other claims of r...

This paper presents the results of a Quality of Service (QoS) study for VoIP service over 3G WCDMA networks. An end-to-end simulation platform has been used for this purpose. The simulations have been run using Adaptive Multi-Rate (AMR) speech codec at 12.2 kbit/s with combination of RTP, UDP and IPv6 protocols. The simulated transmission path includes two radio links (uplink and downlink), con...

With the rapid requirement and development of the green ICT (Information and Communication Technology) technology, the demand for dynamically radio spectrum resources has significantly attentions. The low utilization of licensed spectrum leads to the scarcity of the spectrum resource. The emerging cognitive radio (CR) systems become increasingly important in the wireless green communication. In...