Vo Nhat Nguyen

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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)
—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)
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)
– 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)
—This paper proposes and analyzes cognitive multi-hop decode-and-forward networks in the presence of interference due to channel estimation errors. To reduce interference on the primary network, a simple yet effective back-off control power method is applied for secondary multihop networks. For a given threshold of interference probability at the primary(More)
—In this paper, we investigate the outage performance of underlay cognitive dual-hop relaying systems under the effect of using statistical instead of instantaneous information of the interference links (from the secondary source and relay to the primary user) and the first relaying link (from the secondary source to relay) to calculate transmit power and(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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