-The demand for increased channel capacity in wireless and mobile communication has been rapidly increasing due to multi fold increase in demands of mobile data and multimedia services. In the present scenario, high data rate are provided by WLAN, WiMax and LTE/ LTE-Advanced (LTE-A). Developing a wireless system with more spectral efficiency under varying channel condition is a key challenge to...

Overview Long Term Evolution (LTE) is the next step forward in cellular 3G services. Expected in the 2008 time frame, LTE is a 3GPP standard that provides for an uplink speed of up to 50 megabits per second (Mbps) and a downlink speed of up to 100 Mbps. LTE will bring many technical benefits to cellular networks. Bandwidth will be scalable from 1.25 MHz to 20 MHz. This will suit the needs of di...

This paper assesses the main challenges associated with the propagation and channel modeling of broadband radio systems in a complex environment of high speed and metropolitan railways. These challenges comprise practical simulation, modeling interferences, radio planning, test trials and performance evaluation in different railway scenarios using Long Term Evolution (LTE) as test case. This ap...

LTE (Long Term Evolution) designates the successor to the widespread mobile radio standard UMTS (Universal Mobile Telecommunications System). Its introduction is one of the responses to the rapid growth in mobile data traffic. To date, the volume of traffic transmitted over mobile networks worldwidehas doubled every year. In many countries, including Switzerland, this traffic doubling time is j...

In April 2008, the 3 rd Generation Partnership Project (3GPP) agreed on its candidate technology named as LTE Advanced (LTE-A) to fulfill the requirements of IMT Advanced which was recently defined by ITU. According to the requirements, LTE-A is expected to provide high data rates while maintaining coverage proportional to LTE Release 8. In this thesis, a novel way of implementing the relaying ...

Dopamine (DA) induction of the long-term enhancement (LTE) of the slow muscarinic depolarizing response to methacholine (MCh), equivalent to the slow EPSP (S-EPSP), was previously found to be mimicked by exogenous cyclic AMP (cAMP) in the rabbit superior cervical ganglion (SCG). DA-induced LTE of the S-EPSP was shown to be depressed by some DA antagonists. We now show that DA (15 microM), its a...

A detailed study of the performance of MIMOOFDM transmission on WLAN physical layer specified in IEEE 802.11n, Wi-MAX (IEEE 802.16-2009) physical layer specified in 802.16 and LTE downlink physical channel (PDSCH) has been carried out using MATLAB Simulink. The WLAN and Wi-MAX system incorporates Convolution coding with 1/2 and 2⁄3 rated codes. The LTE incorporates Turbo coding with 1/2 and 2/3...

This article explores the recent 3GPP LTE D2D rel. 14 Radio Resource Management specification to identify the challenges and evaluate the potentials of Unsupervised LTE D2D (mode 2) for Safety-critical V2X Communications. It also proposes two distributed resource allocation strategies for unlicensed band access. Complementary to DSRC/ITS-G5, unsupervised LTE D2D is an opportunity to provide red...

The ever increasing demand for higher mobile data rates continues to rise challenges for researchers and developers. As the the available spectral resources remain essentially the same, the key to higher data rates lies in improving spectral efficiency. Multiantenna techniques are one of the most important technologies to enhance spectral efficiency, enabling the transmission of multiple spatia...