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In this paper, an upper bound expression of the outage probability (OP) under interference power constraint is derived for cognitive amplify-and-forward (AF) relay network with best relay selection (BRS) scheme. In the proposed model, the destination moves at high speed, more than 100km/h and the channels that connected with destination are modeled as Nakagami-m fading channels, m < 1 whereas the...
This paper presents a method of increasing the secrecy capactty utilizing the channel diversity technique in wireless communication. In general, a relatively higher secrecy capactty can be achieved at the intended receiver by deploying channel diversity to mitigate the effect of low signal to noise ratio. In this analysis, the legitimate receiver and the eavesdropper are assumed to employ maximal...
In this paper, closed form outage probability is derived for cognitive amplify-and-forward (AF) relaying system in a spectrum sharing environment for a moving end mobile users. The end users can move at high vehicular speeds which cause dynamic multipath fading and a high Doppler shift. The transmit power of the secondary network is governed by the maximum interference power that the primary network's...
This study investigates the impact of the diversity combining techniques on the performance of wireless code division multiple access (CDMA) ad hoc networks operating over κ-μ fading channels, where the performance criterion in this study is in terms of the expected progress per hop. The probability density function (PDF) and the cumulative density function (CDF) of the interference power are obtained...
This paper proposes a method for transmitting data through a best relay selection technique in a cooperative network over Nakagami-m fading channels. The selection of the best relay among multiple decode and forward relays is based on the minimum outage probability criterion. Therefore, only the relay with the lowest outage probability will transfer the data to the destination. A closed-form expression...
In this study, approximate symbol probability of error (i.e., symbol error rate) formulas are derived for both of the M-ary phase shift keying and M-ary quadrature amplitude modulation constellations schemes. These formulas are obtained over slow, flat, and independent and identically distributed Nakagami-m fading channels, where the orthogonal space-time block codes is utilized. This approach reduces...
This paper analyzes the performance of wireless code-division multiple access (CDMA) ad hoc networks in the κ-μ fading environment in terms of the expected progress per hop. Expressions for the probability density function (PDF) and the cumulative density function (CDF) of the interference power over κ-μ fading channels are derived by using the characteristic function approach. Furthermore, the CDF...
Infrared based identification system is a promising alternative for radio frequency identification system in order to provide powerful solutions in many situations, i.e., to overcome radio frequency interference. In this work, an infrared-based identification system is modeled and designed. This model consists of a reader and a tag. The reader will perform particular functions in order to communicate...
Worldwide interoperability for microwave access (WiMAX) is an IEEE802.16 standard that provides low cost, high-speed and long-range wireless communications, where the 802.16m is the latest version of WiMAX standard fully optimized for fixed and pedestrian speeds. Due to dynamic multipath fading and high Doppler shift, there is service degradation on quality of service (QoS) and data rate. In this...
In this study, approximate symbol error rate (SER) expressions are derived for M-ary phase shift keying (M-PSK) modulation scheme. Here, the channels are assumed to be slow-flat independent and identically distributed (i.i.d) with Rician and Rayleigh fading distributions. Simulation results show that by using maximum ratio combining (MRC) space diversity technique, the communication reliability (i...
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