Spectrum Sensing in Cognitive Femtocell Networks

In: Computers and Technology

Submitted By Jrowlands
Words 3980
Pages 16
Abstract—Cognitive Femtocell has been envisioned as a highly promising solution for spectrum scarcity problems and local-convergence demands for indoor network applications. However, the achievable gains from Cognitive Femtocell deployment is limited by the hidden node problem leading to increased interference and consequently reduced spectrum efficiency. In this paper we compare the degree of performance enhancement when a cooperative mode is used to share information about the channel versus when standalone decisions are taken about the state of the channel. Simulation results indicate superior performance of the cooperative mode in terms of the number of observed hidden nodes and probabilities of detection and false alarm.
Keywords—Femtocell; Cognitive Radio; Dynamic Spectrum Access; Energy Detection; Hidden Node Problem; Spectrum Sensing; IEEE 802.22.
I. INTRODUCTION
Recent surveys have shown that indoor traffic accounts for more than 50% of the total data and voice traffic carried in wireless networks with most of the traffic originating from homes, airports, and schools [1] .This skyrocketing growth of indoor traffic coupled with the increased user demand for high broad band services necessitates new solutions that will provide the required indoor coverage and bandwidth. The existing macrocells are not efficient at delivering indoor coverage due to the high penetration losses in walls during signal propagation which leads to low coverage regions (black spots) [2].The promising solution towards satisfying the user requirements lies in the deployment of the low-cost low-power Femtocell Access points (FAP) which will enhance indoor coverage, deliver the required high bandwidth and also offload traffic from the macrocell networks [3]. Due to the proximity of indoor mobile users and the femtocell Access Point (FAP), the indoor signal to interference and noise…...

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