Exploiting the operating point in sensing-based opportunistic spectrum access scenarios
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Cita com:
hdl:2117/8849
Tipus de documentComunicació de congrés
Data publicació2009
Condicions d'accésAccés obert
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Abstract
Spectrum sensing is one key enabler towards opportunistic spectrum access in cognitive radio networks. Such scenarios allow cognitive users (a.k.a. secondary users) to access some licensed spectrum band as long as they do not interfere with the licensed (or primary) users. The main goal is to achieve an efficient and utmost access to the otherwise underutilized spectrum resources while still guaranteeing primary users a non-harmful operation. Spectrum sensing can be then used by secondary users to detect spectrum holes that may be accessed
in a non-interfering manner. However, spectrum sensing may be subject to errors in the form of false-alarm and misdetection.
False-alarm causes spectrum under-use while misdetection leads to spectrum interference between primary and secondary users.
Unfortunately, these two magnitudes pose a trade-off on the sensing mechanism: low misdetection is achieved at the expense
of high false alarm and vice versa. Consequently, an adequate operating
point of the sensing mechanism should be determined. In this work we evaluate the impact of false-alarm and misdetection
errors on the performance of a spectrum sensing scenario.We use a Discrete Time Markov Chain (DTMC) model and we determine
the suitable operating point for the sensing mechanism under different traffic load conditions such that some Quality of Service
is attained by both primary and secondary users. Performance results reveal that by effectively choosing the operation point
bearing in mind the traffic load levels will lead to enhanced perceived quality of service of both primary and secondary users.
CitacióGelabert, X. [et al.]. Exploiting the operating point in sensing-based opportunistic spectrum access scenarios. A: IEEE International Conference on Communications. "IEEE International Conference on Communications 2009". Dresden: 2009, p. 1-6.
ISBN978-1-4244-3435-0
Versió de l'editorhttp://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5199018
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