| Summary: | In recent years, the demand of bandwidth has increased rapidly due to the growth of new technologies in wireless communication systems along with the rise of traffic flow. This has made the radio spectrum in a short supply. On the other hand, according to a lot of studies, a large amount of spectrum is unutilized due to the regulatory and the limit of licensing. Hence the concept of secondary access is proposed which allows secondary users (SU) to use the unoccupied spectrum licensed to the primary users (PU) without violating their quality of service (QoS). TV white space is considered as a valuable promising solution to make up the spectrum shortage issue. In this report, we present a quantitative analysis of operating Wi-Fi like system in TVWS compared with in traditional ISM band in two reasonable scenarios. Unlike previous research on this topic, we consider the SU transmit power constraint as the premise of our work. Furthermore, we choose some innovative control parameters such as TV receive signal strength, unoccupied TV channel number to investigate the dependency of TVWS system on the environmental factors. Different channel aggregation schemes and additive carrier detection threshold are also taken into account. Our results show that the system performs better in TVWS as long as 8 unoccupied TV channels exist and no less than 4 channel aggregation scheme applied in both scenarios. Suburban scenario is more sensitive to the regional TV receive signal strength than urban scenario. Therefore, adaptive methods should be developed in order to improve the system performance according to different situations.
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