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The purpose of designing a reliable energy efficient communication network is to achieve a precise performance without any disruption. Energy efficiency of a mobile station (MS) is extremely important for the WiMAX (IEEE 802.16) networks. The WiMAX mesh network may use either centralized or distributed techniques for distributing resources. This paper proposes a hybrid channel allocation technique...
Multihop relaying in WiMAX networks is considered an increasingly attractive technology for providing throughput enhancement, coverage extension, or both. In this paper, we consider deploying non-transparent relay stations (RSs) that transmit on the same carrier frequency as the base station (BS) for the purpose of coverage extension. Since it is possible that the RSs and BS are transmitting/receiving...
In modern Orthogonal Frequency Division Multiple Access (OFDMA) systems Multi-User Multiple-Input Multiple-Output (MU-MIMO) techniques are employed to increase the cell and user throughput without additional bandwidth or transmit power requirements. The increased throughput in the downlink is achieved by simultaneous transmission to multiple mobile stations (MSs) over the same time-frequency resources...
In recent years, Self-management (Self-X) technologies that fully automate the tasks of managing (i.e. configuring, monitoring, and optimizing) a cellular network are emerging as an important tool in reducing service provider OPEX and CAPEX and will be a distinguishing feature of LTE (Long Term Evolution) networks. In this work, we focus on one such Self-X technology, namely, self-configuration of...
WiMAX with femto cells is a cost-effective next generation broadband wireless communication system. Cognitive Radio (CR) has recently emerged as a promising technology to improve spectrum utilization by allowing dynamic spectrum access. There will be large potential benefits by applying the CR technique to WiMAX with femto cells, which are barely explored in the literature. In this paper, we propose...
We have recently proposed a novel receiver for Ultra-Wide-band Impulse-Radio communication in bursty applications like Wireless Sensor Networks. The receiver, based on the principle of Compressed Sensing (CS), exploits the sparsity of the transmitted signal to achieve reliable demodulation. It acquires a modest number of projections of the received signal using analog correlators, and performs a joint...
Femtocell is a small base station with low power which can be installed by users to get better data rate in the indoor environment. The power control scheme of the femtocell BS is the most important issue in the femtocell implementation but there still exist deadzones if macrocell users are located very close to the femtocell. In this paper, we have proposed a new frame structure for the IEEE 802...
In recent years, smart antenna technologies are of ever-increasing interest to boost the capacity of existing and future wireless systems. Several standards support these techniques such as the wireless metropolitan area network IEEE 802.16 (WiMAX) and IMT-Advanced candidates. In applying smart antenna beamforming and Space Division Multiple Access (SDMA) techniques, adaptive antennas are able to...
Proportional fair (PF) scheduling is a widely used technique in recent wireless communication systems. However, scheduling will also bring about a lot of signaling overhead especially in OFDMA based systems which have many subchannels, assigning these subchannels to users and feeding back channel quality information to Base Station produce much overhead. In many situations, neglecting the overhead...
The IEEE 802.16 standard defines WiMax (worldwide interoperability for microwave access) mesh network, using the base station (BS) as a coordinator for centralized scheduling. This paper proposes a centralized scheduling algorithm by constructing routing tree in WiMax mesh network, which introduces the cross-layer concept between the media access controller (MAC) and the network layers. The interference,...
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