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In a multi-user power line communication (PLC) home network, there are several methods to decide who has the right to use the channel to send data. Basically, there are two kinds of scheduling schemes: coordinated and contention-based. For coordinated scheduling scheme, the manager of PLC network, called domain master, will arrange available medium for users according to network resources and users'...
A new cross-layer design taking advantage of OFDMA in ad hoc networks is presented. OFDMA technology is exploited at the physical layer to improve data rate through multiuser diversity and to enhance channel throughput by enabling multiple concurrent transmissions over orthogonal subchannels, each consisting of a group of tones or subcarriers. The proposed Subchannel Selection Algorithm (SSA) addresses...
We investigate the maximum throughput and minimum delay for the unslotted version of the IEEE 802.15.4a using Ultra Wide Band (UWB). The throughput and delay limits are calculated for different data rates along with the formulae. UWB based 802.15.4a can achieve maximum throughput of 701 Kbps with a data rate of 851 Kbps.
The upcoming IEEE 802.11p/WAVE (Wireless Access for Vehicular Environment) standard is intended to deliver both safety and non-safety applications to vehicles on the roads. Despite the massive research effort related to the design of reliable and timely schemes for dissemination of safety messages, only a few works have investigated on-the-road delivery of non-safety applications, such as comfort...
The maximum nominal data rate specified in IEEE 802.11a is up to 54 Mbps. However, in practice, we find that the data rate which users can get is much lower than that. In order to accurately evaluate the ability of IEEE 802.11a to support data services, we improve the existing two-dimensional Markov chain models of the backoff window scheme, and analyze the efficiency of the IEEE 802.11a standard...
In heterogeneous mobile adhoc networks, nodes are likely to transmit at different power levels, thereby resulting communication links of varying range. Traditional MAC protocols that implicitly assume that links are bi-directional and uniform energy distribution will either fail or perform badly. As well interference and signal loss due to distance and fading severely diminish the total throughput...
We present a game-theoretic study on the power and rate control problem in IEEE 802.11 WLANs where network participants choose appropriate transmission power and data rate to achieve maximum throughput with minimum energy consumption. In such game-theoretic study, the central issues are the existence, uniqueness of the Nash equilibrium (NE), the convergence to the NE and the system performance at...
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