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This paper presents a characteristic expression to determine the effective bandwidth of broadband wavefields observed over a source-free finite spherical region. To address this topic, for given constraints on size of the observation region and bandwidth, we characterize the observable wavefield using modal expansion of wave propagation in 3D. When signals are transmitted to a spatially constrained...
In cooperative spectrum sensing (CSS), sharing local sensing data with the fusion center (FC) incurs reporting slots, most of which are often wasted in previous studies. It is even more serious when the common control channel (CCC) is under bandwidth constraints, since the reporting slot is relatively longer. In this paper, we propose a novel frame structure for CSS to address this problem. The proposed...
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...
This paper explores the attributes, layering models and objective functions in cross layer designs for mobile ad hoc wireless networks by taking all the statistical characteristics and constraints from the physical (PHY) layer, media access control (MAC) layer and network (NET) layer into consideration. This paper reviews the entire network optimization across all the PHY/MAC/NET layers. At the PHY...
The next generation of wireless networks (4G) will use OFDMA (Orthogonal Frequency Division Multiple Access) in the reverse link. In OFDMA, the reverse link resources assigned to a user are called tiles each of which consists of a subset of consecutive subcarriers. Since at most one user is assigned to each of these tiles then reverse link transmissions within a sector are orthogonal. However, the...
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