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Physical-layer network coding (PNC) can significantly improve the throughput of wireless communication systems by exploiting signal superimposition at relays. It is practically challenging to achieve symbol alignment in PNC. In this paper, we study the impact of the signal power loss and the inter-symbol-interference (ISI) on the system performance when the symbols are not aligned. We show that when...
In this paper, we consider a cognitive relay network, in which multiple pairs of secondary users (SUs) share the unlicensed spectrum by the overlay mode, and for each SU pair, the two ends exchange data via a common relay node that senses the spectrum and allocates the unused bandwidth. Here, we formulate the spectrum allocation problem as a multi-object auction and introduce the mechanisms of sequential...
A time sharing relaying system model using Orthogonal Frequency Division Multiple Access (OFDMA) is investigated in this paper, where eNode B transmits to relay and macro user equipments (M-UEs) during the first time slot, and in the second time slot messages are conveyed to remote user equipments (R-UEs) by the relay with relay acting in the decode-and-forward (DF) mode. These two transmissions are...
Cooperative wireless networks supporting multiple services necessitate the application of a robust bandwidth allocation policy to ensure Quality of Service (QoS) provision to different applications. In this work, a load dependent bandwidth allocation technique is presented considering traffic priority and buffer load in the relay nodes of a cooperative communication network. An analytical approach...
In this paper, the outage performance is investigated for orthogonal frequency division multiplexing (OFDM)-based selective amplify-and-forward cooperative networks over independent but not identically distributed (i.n.i.d.) Nakagami-m fading channels, with integer values of parameter m. A unified closed-form expression for the outage probability is derived for three selective relaying schemes. The...
In this paper we proposed two extensions to the recently proposed Phase Forward (PF) relaying strategy for cooperative communication. One extension is the replacement of CPFSK modulation by the more practical Gaussian filtered minimum shift keying (GMSK) modulation scheme. The second extension is the incorporation of antenna selection at the relay. Semi-analytical expressions for the bit error probabilities...
In this work, we propose using video caching in the wireless relay networks (WRNs) for video on demand (VoD) service. We assume the relay station (RS) of the WRNs is capable of caching a small portion of the ongoing video stream. The cached video data can be used to accommodate new user requests. Previous works on video caching for VoD are in the context of overlay network, where the physical topology...
We propose a dynamic resource allocation scheme for a wireless cooperative network based on orthogonal frequency division multiplexing (OFDM) modulations with limited feedback. The amount of the feedback information required from the relay to the source in the proposed scheme is independent of the number of subchannels, which results in a dramatic reduced overhead over conventional resource allocation...
This correspondence demonstrates the significant gains that multiple-access users can achieve from sharing a single amplify-forward relay in slow-fading environments. The proposed protocol, namely, multiple-access amplify-forward (MAF), allows for a low-complexity relay and achieves the optimal diversity-multiplexing tradeoff (DMT) at high multiplexing gains. Analysis of the protocol further reveals...
In this paper, we propose a robust STBC transmission scheme to combat the timing synchronization errors over frequency-selective multiple-access channels. First, the equivalent channel model in the presence of timing synchronization errors is derived and we find that the synchronization errors result in an equivalent channel model with larger number of correlated channel taps. Based on this correlated...
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