In this Paper the exact expressions for the Symbol Error Probability (SEP) of Hybrid Selection/Maximal Ratio Combining wireless systems for M-ary QAM are derived and analyzed in multipath fading environment. Independent Rayleigh fading diversity branch is assumed for analysis with equal Signal-to-Noise Ratio averaged over the fading channels and coherent detection of M-ary Quadrature amplitude ...

The purpose of this investigation was to examine the effects of presentation mode on speech intelligibility in adverse listening conditions as signal-to-noise ratio was systematically varied in anechoic and reverberant environments. Speech intelligibility scores were obtained from 21 normally hearing listeners using a nonsense syllable test. The syllables were recorded in three environments (mo...

In virtual cellular network (VCN), proposed for high-speed packet mobile communications, the signal transmitted from a mobile terminal is received by wireless ports distributed in each virtual cell and relayed to the central port that acts as a gateway to the core network. In this paper, multi-hop maximal ratio combining (MHMRC) diversity is presented for the VCN to reduce the transmit power wh...

background: with the recent spread of virtual learning programs in universities, especially in the field of medical sciences, libraries play a crucial role to support these programs. this study aimed at investigating the skills required by librarians to support virtual learning programs in isfahan university and isfahan university of medical sciences.   methods: this was an applied survey study...

there has been a recent development and explosion of interest among academicians across a wide range of disciplines in the use of virtual class room. utilization of the virtual class room as a laboratory experimentation for teaching and learning has increased significantly in recent years as development tools for web based applications have become easier to use and computers have become more ca...

at the moment determining of the pulse wave main parameters using a piezo sensor is performing using the RC adjustments in the circuit. With the increasing adaptation of the virtual instrumentation it is possible to reduce the RC complexity. The purpose of this work was to determine the piezoelectric actuator transfer function according to the signal of the air pressure sensor using virtual ins...

This paper presents a technical solution for sensor network monitoring based on virtual instrumentation. Computer developing allows usage of virtual instrumentation for measurement, data acquisition, signal processing, estimation, monitoring, fault detection and diagnosis. The sensor networks may be use as distributed measuring sensors for the physical variables in distributed parameter systems...

with the advent of cyberspace and development of data and information, virtual cities were presented as new forms of city management in different layers and territories. historic and tourism virtual city are among eight types of virtual cities. in this article some guidelines were presented in order to design and manage them based on tehran tourists' need assessment. theoretical framework ...