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In this paper, we present a new analysis of the optimal throughput of a single user for transporting MPEG-4 video over universal mobile telecommunication system (UMTS) network. A wireless channel considers that bit errors associated with link-layer packets are due to the time-varying features of a wideband code-division-multiple access (WCDMA) channel. By this network, the perceived video quality...
In this paper, we propose and adaptive M-ary Quadrature Amplitude modulation (M-QAM) transmission scheme that jointly uses selection combining and power loading over multiple independent and identically-distributed (i.i.d) Rayleigh fading channels in multi-channel systems. We derive exact closed-form expressions of the performance of the proposed scheme in terms of the spectral efficiency, the average...
One of the disadvantages that are associated with orthogonal frequency division multiplexing (OFDM) is high peak to average power ratio (PAPR). In most cases, this high peak signal often forces practical amplifiers to operate in the nonlinear region and causes additional degradation to the system's performance. Since the frequency bandwidth is a scarce resource, it is inevitable that a wireless communication...
This work proposes a general equation for the channel reliability (Lc) of DS/CDMA turbo coding systems under fading Rayleigh channels and multiple access interference. The proposed reliability equation is suitable for low, medium as well as high signal-noise ratio (SNR) system operation conditions. The Lc equation is established as a function of the ratio of active users and the processing gain (loading...
In this paper, we investigate the outage probability of a wireless two relay (diamond relay) network which consists of a source, a destination and two network clusters. Each cluster is defined by a number of cognitive nodes (unlicensed) and a primary node (licensed). The cognitive nodes relay the source information by employing opportunistic spectrum access. We consider amplify-and-forward (AF) relaying...
In this paper, we investigate the effect of Rayleigh fading on the connectivity of wireless ad hoc networks. We consider static nodes that are equipped with omnidirectional antennas and are randomly distributed in the network according to a uniform distribution. We derive an analytical model for evaluating the impact of Rayleigh fading on the network local connectivity and present an accurate upper...
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