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– Relay communication has advantages over direct transmission in terms of secrecy capacity. In this paper, the performance of secrecy, offered by multihop decode-and-forward relaying, is investigated and compared to its counterpart in direct transmission. Three key performance measures are derived over Rayleigh fading channels: probability of non-zero(More)
recursively updated Cholesky decomposition-based detector performs as well as [1] with a much reduced computational complexity. The novel algorithm can easily be extended to uplink CDMA system, where the channel paths between the base station and the different users are different. ACKNOWLEDGMENT The author would like to thank E. Manuel of the College of(More)
The problem of channel estimation for spatially correlated fading multiple-input multiple-output (MIMO) channels is considered. Based on the channel's second order statistic, the minimum mean-square error (MMSE) channel estimator that works with the superimposed training signal is proposed. The problem of designing the optimal superimposed signal is then(More)
—This paper is concerned with performance analysis of cognitive underlay partial relay networks with imperfect channel state information (CSI). To assure the required quality of service (QoS) at primary receivers, transmit power at secondary nodes is adjusted by using a back-off power scheme under imperfect CSI condition. The back-off power strategy reduces(More)
In this paper we take some initial steps towards deep reasoning with respect to natural language text in scientific domains. In particular we consider answering Why and How questions with respect to a high school Biology text. In comparison to other kinds of questions, Why and How questions (the later referred to as procedural questions by some) have been(More)
—Selection decode-and-forward (DF) relaying and in-cremental relaying were introduced as efficient relaying protocols to increase capacity and performance of cooperative diversity networks. This paper proposes an incremental relaying in conjunction with selection DF and provides its performance in terms of outage probability and bit error probability. Our(More)
Decode and Forward (DF) is a type of opportunistic relay in which the packet is relayed only when the direct transmission of information from source to the destination fails. This results in bandwidth optimization of the overall system as well as considerable saving of resources by avoiding the unnecessary relay of information when it is not required. In(More)
Posture detection using Inertia Measurement Unit (IMU) has recently attracted great interests in healthcare research community. However, very few studies focus on the applications of this technology in the care of inpatients. This specific group of users, who are moderately to severely ill, have a distinct set of postures and activities that require special(More)
—In cognitive spectrum sharing systems, interference probability (IP) is one of the most important performance metrics illustrating the interference level at the primary network. In this paper, the interference probability of the primary network due to secondary underlay partial relay selection networks is investigated under the assumption of imperfect(More)
Selection relaying (SR) achieves the powerful benefits of multi-antenna systems without the need for physical arrays. It is theoretically shown that when the relay measures log-likelihood ratio (LLR) instead of signal-to-noise ratio (SNR) to decide whether or not to forward the recovered symbols to the destination, the performance of SR with equal energy(More)
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