Abstract
The proliferation of wireless communications systems poses new challenges in terms of coexistence between heterogeneous devices operating within the same frequency bands. In fact, in case of high-density concentration of wireless devices, like indoor environments, the network performance is typically limited by the mutual interference among the devices themselves, such as for wireless local area networks (WLANs). In this paper, we analyze a protocol strategy for managing multiple access in wireless networks. A network of sensors colocated with the WLAN terminals forms a control layer for managing the medium access and scheduling resources in order to limit collisions and optimize the WLAN data traffic; this control layer is based on a low-power wideband technology characterized by interference robustness, like CDMA (code division multiple access) or UWB (ultra-wideband) for sensors. In this work, we perform an analytical and simulative performance study of the saturated throughput, showing numerical results for the UWB-IR (Impulse Radio) sensors case and highlighting the advantage that can be provided particularly in very high capacity systems, which constitute the necessary evolution of current WLAN versions.
Highlights
Modern wireless systems are required to manage radio resources in an effective and flexible manner in order to maximize the network capacity
We can observe the following: (1) As expected, when the UWB control layer works correctly with low failure probability (≤0.01) in the through a specific packet (TRP) and ack packets detection, the wireless local area networks (WLANs) throughput achieves the maximum, equal to the lossless exploitation of the point coordination function (PCF) access
The numerical results, which exploit propagation data obtained by ray-tracing simulations, show that an UWBIR control layer is compatible with the WLAN network, at least for short-medium ranges or when the correlation between the WLAN and UWB channel propagation path losses is high
Summary
Modern wireless systems are required to manage radio resources in an effective and flexible manner in order to maximize the network capacity. For WLANs (wireless local area networks), the transmissions are typically organized on a packet basis, so that each node occupies the medium for a time interval that is much shorter than the transmission period In this context, with reference to conventional multiple access schemes, both deterministic [1] and random [2], several methods for controlling or mitigating the mutual interference have been proposed in the recent years. The most classical approaches are based upon the concepts of interference averaging, when interference is distributed statistically among the users, or interference avoidance, when some form of coordination in the network allows the minimization of the interference effects [3,4,5,6,7] In this category we find the traditional techniques for assuring orthogonality or quasi-orthogonality among the channels, as frequency, time and code division techniques, and random access protocols. Solutions related to the interference control concept have acquired interest: interference alignment [8] is one of the most relevant examples of a mechanism for controlling the interference components at a generic receiver
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