Performance analysis of both WIMAX and LTE technologies
Résumé
Nowadays, mobile communication has become the most potential with great demand technology in the field of communication. It has been through three main parts in the history. The first generation is from 80s in the 20th century, simulation and Frequency Division Multiple Access (FDMA) technology was mainly used in that time. Then the second generation (2G) originated in the early period of 90s, Time Division Multiple Access (TDMA) and Code Division Multiple Access (CDMA) technology became the leading role at that time. After that he third generation could offer wider frequency band comparing to the first two generation. With this new technology, not only voice can be transmitted, but also data with a high speed. Although the third generation mobile communication standard is more powerful than existing wireless technologies, it also faces competition, incompatible standards and other issues. Therefore, the research of the fourth generation mobile communication systems (4G) comes into being. The 4G should obtain more advantages in communication range, quality and any other aspects than the former communication technology. Meanwhile, the new generation is supposed to have some features such as high speed, high flexibility and high compatibility. Two emerging technologies, the IEEE 802.16 WiMAX(Worldwide Interoperability for Microwave Access) and the 3GPP LTE(Third Generation Partnership Project Long Term Evolution) purpose to meet the requirements of 4G standards and provide mobile voice, video and data services by promoting low cost deployment and service models through Internet friendly architectures and protocols. Both of them are being considered as candidates for the 4G mobile networks. In chapter 1 and 2 of this paper, we present the overview for the WiMAX and LTE technology respectively though their physical layer and MAC layer structure. Then we introduce the QoS mechanism of them which are an important part of these two technologies. The comparison of WiMAX and LTE in architecture, frame structure, multiple access technology and other features is shown in chapter 3. In chapter 4, a two-level scheduling algorithm (TLSA) for the base station uplink scheduler which is a channel-unaware algorithm in WiMAX is provided. At the end, we use a simulation tool which is QualNet to test the performance of this scheduling algorithm when the physical channel condition changes in chapter 5. Here three parameters such as noise factor, fading factor and shadowing factor are used in this experiments. We offer the analysis of the experiment finally.
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