Throughput analysis for wireless multi-hop CSMA
ABSTRACT We investigate the impact of power control on the performance of a multi-hop CSMA/CA system, also taking into account the additional traffic generated due to multi-hop transmissions. An analytical model is presented with emphasis on the influence of power, more specifically the number of nodes dwelling in the area covered by this power, on the number of hops and, consequently, on the end-to-end throughput. Unlike other works, a closed form solution is derived for the throughput performance of a multi-hop CSMA/CA system, as a function of the offered load, the nodes density and transmission power.
Conference Paper: Performance evaluation of 802.11 WLAN in a real indoor environment[Show abstract] [Hide abstract]
ABSTRACT: Performance evaluation of wired networks is a well-known problem and many works consider the performance evaluation of wireless networks as the same problem. Compared to wired networks, wireless networks suffer from the shadow effect and Rayleigh fading which makes its performances difficult to predict. Most of the existing performance stochastic models assume that the radio channel is ideal, and as a result, do not consider the radio environment and the interferences. However, we find that deploying a real wireless LAN (especially indoor WLAN) in different environments leads to quite different performance results. We propose in this paper a method integrating radio characterizations in an analytical performance model. Taking advantage of our model, we are able to predict the performance of a wireless network (throughput, global capacity, etc.) of an indoor 802.11b WLAN, whose radio planning chart is known (through radio planning tool WILDE). We also analyze some special scenarios: network with more than one access point and the hidden terminals problemWireless and Mobile Computing, Networking and Communications, 2006. (WiMob'2006). IEEE International Conference on; 07/2006
Conference Paper: Analytical Approach to Maximize Throughput in Wireless Ad Hoc Networks.[Show abstract] [Hide abstract]
ABSTRACT: The main concerns of network performance are throughput, end-to-end packet delay and packet loss. A high-performance network is characterized by high throughput, small delay, and low packet loss. A larger transmission radius increases the probability of finding a receiver with large progress, but simultaneously increases the probability of collision with other transmissions. Transmission range and the expected progress are pair of design parameters. A short-range transmission is preferred in terms of successful transmission because its avoid collision at the receiver. Long transmission range is favourable in term of: i- it moves a packet the maximum it can in one hop in successful transmission, and ii- the high probability to find a receiver candidate in the progression direction. In this paper, a theoretical model to analyse the one hop throughput with regular structure operating under the CSMA/CA access protocol in wireless ad hoc networks is proposed. We show how we can maximize mean packet progress and mean density of information transport by optimizing the transmission probability and the transmission range. Numerical results show that we can find an optimal transmission range to achieve the highest throughput. An optimal transmission range is essential to limit the energy dissipation on the mobile devices.8th Annual Conference on Communication Networks and Services Research, CNSR 2010, 11-14 May 2010, Montreal, Canada; 01/2010
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ABSTRACT: In this paper we consider practical dissemination algorithms exploiting network coding for data broadcasting in ad hoc wireless networks. For an efficient design, we analyze issues related to the use of network coding in realistic network scenarios. In detail, we quantify the impact of random access schemes, as used by IEEE 802.11, on the performance of network coding. In such scenarios, deadlock situations may occur where the delivery process stops and some of the nodes never gather the required packets. To tackle this problem, we propose a proactive mechanism (called proactive network coding) which adapts its transmission schedule according to the decoding status of neighboring nodes. This scheme can detect when nodes need additional packets in order to decode and acts accordingly. We finally investigate the behavior of network coding schemes in multi-rate environments, where we propose a distributed heuristic approach for the selection of data rates.IEEE Transactions on Wireless Communications 03/2010; · 2.42 Impact Factor