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Packet delay is a key quality of service (QoS) parameter for networks. In this paper, we derive the closed-form expression for the pdf of the delay in multi-PU, multi-SU dynamic spectrum access networks. We show that the transmission delay has an exponential distribution when the activity periods of the PUs and SUs are exponentially distributed. We also derive the dominant QoS exponent which mainly...
In this paper, we study two important quality of service (QoS) parameters of dynamic spectrum access (DSA) networks with multiple primary and secondary users. We assume that the secondary users (SUs) are delay tolerant and model the primary user (PU) and SU activity as Markov chains with ON and OFF states. We derive a closed form expression for the probability distribution of buffer occupancy for...
Efficient and fair resource allocation in cognitive radio (CR) networks under strict constraints imposed by the primary network is a challenging problem for underlay dynamic spectrum access (DSA) networks. Due to the distributed nature of secondary networks, traditional approaches are usually computationally inefficient in providing fair resource management while meeting severe constraints imposed...
In this paper, we analyze the cooperative diversity of amplify-and-forward half-duplex relay networks under long-term power constraints. The system model we consider consists of one transmit-receive pair and an arbitrary number of relays. This paper analyzes bit error rate and network diversity for two different power distribution scenarios in network. Using the derived network error probability,...
In this paper, we investigate the error probability, diversity analysis and outage capacity of a general multiple-antenna equal-gain receive combining (EGC) scheme with an arbitrary number of antennas at high signal-to-noise (SNR) ratio. As will be shown, the proposed approach which is based on Taylor expansion provides a powerful tool for analysis of EGC schemes in terms of diversity and outage capacity...
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