In this paper, field measurements carried out in a suburban SFN network with two synchronized transmitters are reported. It is found that the radio signal coverage of the distributed transmission scheme is distinctly improved when compared to a single transmitter system. The path loss gain and improvement associated to the SFN scheme are obtained as well as the multipath channel parameters incl...

how to cite this article: fayyazi a, kheizrian l, kheradmand z, damadi s, khajeh a. evaluation of the young children with neurodevelopmental disability: a prospective study at hamadan university of medical sciences clinics. iran j child neurol. 2013 winter; 7 (1):29-33.   objective developmental impairment is a common problem in children health that occurs in approximately 5–10% of the childhoo...

A mobile social network (MSN) is a special kind of delay tolerant network (DTN) composed of mobile nodes that move around and share information with each other through their carried short-distance wireless communication devices. A main characteristic of MSNs is that mobile nodes in the networks generally visit some locations (namely, community homes) frequently, while visiting other locations l...

Ultrawideband (UWB) technology offers short-range high-data transmission rates. Most researchers in recent times have focused on indoor UWB channel measurements and in instances where outdoor cases were reported, they focused on static scenarios. This paper reports on mobile outdoor channel measurements typical of roadway and recreation park Infostation scenarios. It also chronicles the delay s...

This paper investigates the handover performance on high speed train (HST) via different speed under three scenarios, which are viaduct environment, cutting environment and urban area. To provide stable wireless service, we adopt Long Term Evolution (LTE) for high speed railway (HST) system. Moreover, we consider the effect of speed on handover procedure. Interchannel interference (ICI) caused ...

The frequency selectivity of wireless communication channels can be characterized by the delay spread Ds of the channel impulse response. If the delay spread is small compared to the bandwidth W of the input signal, that is, DsW ≈ 1, the channel appears to be flat fading. For DsW ≫ 1, the channel appears to be frequency selective, which is usually the case for wideband signals. In the first cas...

In this paper, the circular ring model is proposed to model the signal statistics of a wideband multiple-input multiple-output (MIMO) channel. Based on the proposed model, a new space-timefrequency cross-correlation function is derived for the MIMO channel, in a compact mathematical form. The cross-correlation function includes various parameters of interest such as the distance between the bas...

In this paper, we improve the performance analysis of the Rake receiver for the DS-CDMA forward link using long random spreading sequences (RSS’s) [15] by more accurately evaluating the correlation between the various interference terms. We also extend the analysis to the case of short (periodic) RSS. The accuracy of the expressions obtained in our analysis is verified by computer simulation. W...