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This paper presents a novel discrete particle swarm optimization (PSO) technique for the high-level synthesis of digital filter data-paths. In this technique, the cost associated with the final digital filter data-path is minimized for obtaining combined area-cum-time optimal digital filter data-paths subject to user-specified constraints on the number of the required arithmetic functional units....
This paper considers a Gaussian broadcast channel with two unmatched degraded components, three particular messages, and a common message that is intended for all three receivers. It is shown that for this channel superposition coding and Gaussian signalling is sufficient to achieve every point in the capacity region.
A new hybrid digital/analog scheme is proposed for lossy transmission of a Gaussian source over a two-receiver bandwidth-matched Gaussian broadcast channel with source side information available at each receiver. The proposed scheme makes use of a new level of freedom for point-to-point transmission and combines two previously known schemes that are optimal under two different conditions regarding...
Cooperative relay is an effective means to improve spectral efficiency in wireless networks. In this paper, we propose a cooperative relay network protocol based on adaptive cooperative coding (ACC), in which the level of cooperation (LoC) is made adaptive to follow the variation of channel propagation conditions. We derive the strict performance upper bound and asymptotic bound expressions for the...
In this paper, we study the impact of outdated channel state information (CSI) on a cooperative system based on opportunistic relay selection (ORS). The study is carried out by obtaining an analytical expression for the outage probability, defined as the probability that the instantaneous mutual information is lower than a target rate. Besides, we propose the optimal power allocation aimed at minimizing...
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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