نتایج جستجو برای: urban radio propagation
تعداد نتایج: 372900 فیلتر نتایج به سال:
In the densely populated urban area traffic control system is the main mechanism to control the flow of vehicular traffic at the intersection. Conventional traffic control system are not capable of handling dynamic vehicular flow. This dynamic vehicular flow creates traffic jams , congestion at the intersection. Vehicular Ad hoc Network (VANET) is a common part of Intelligent Transport System (...
Performance evaluation of antennas used in the a mobile radio channel is a non-trivial task because of the multipath propagation inherent to this type of channel. A useful measure of the performance of a given antenna is the mean effective gain (MEG) which is the mean received power relative to some reference. In this paper computation of the MEG is investigated based on measurements of the 3D ...
The performance of wireless communication systems depends on the radio wave transmission path between the transmitter and the receiver. Unlike wired channels that are stationary and predictable, radio channels are extremely random. In addition, electromagnetic wave propagation characteristics vary significantly over different frequency bands. Therefore it is vital to thoroughly understand the p...
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...
In this article we review the fundamental issues involving the simulation of the radio channel and discuss some of the more challenging simulation topics that are pertinent to the radio channel. Radio and propagation channels The propagation channel, together with the transmit and receive antennas, constitute the radio channel. Figure 1 depicts the propagation and radio channel's place in a rad...
The radio channel places fundamental limitations on the performance of mobile ad hoc wireless networks. In the mobile radio environment, fading due to multipath delay spread impairs received signals. The purpose of this thesis is to develop a radio channel model and examine the effect of various parameters on channel behavior that is representative of environments in which mobile ad hoc wireles...
A novel stochastic channel model for the indoor propagation channel is presented. It is especially for, but not limited to future communication systems with multiple antennas like space division multiple access (SDMA), spatial filtering for interference reduction (SFIR), or multiple-input/multiple-output (MIMO). The model is designed for indoor scenarios, straight forward extendable to urban en...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید