Spectrum Sensing for Full-Duplex Cognitive Radio Systems
Full-Duplex (FD) transceiver has been proposed to be used in Cognitive Radio (CR) in order to enhance the Secondary User (SU) Data-Rate. In FD CR systems, in order to diagnose the Primary User activity, SU can perform the Spectrum Sensing while operating.
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LABSTICC UMR CNRS 6285, ENSTA Bretagne, 2 Rue Fran¸cois Verny, 29200 Brest, France [email protected], [email protected] 2 LABSTICC UMR CNRS 6285, Universit´e de Bretagne Occidentale, 6 Av. Le Gorgeu, 29238 Brest, France [email protected] 3 Computer Science Department, American University of Culture and Education, Beirut, Lebanon 4 Computer Science Department, Lebanese University, Beirut, Lebanon
Abstract. Full-Duplex (FD) transceiver has been proposed to be used in Cognitive Radio (CR) in order to enhance the Secondary User (SU) Data-Rate. In FD CR systems, in order to diagnose the Primary User activity, SU can perform the Spectrum Sensing while operating. Making an accurate decision about the PU state is related to the minimization of the Residual Self Interference (RSI). RSI represents the error of the Self Interference Cancellation (SIC) and the receiver impairments mitigation such as the Non-Linear Distortion (NLD) of the receiver Low-Noise Amplifier (LNA). In this manuscript, we deal with the RSI problem by deriving, at the first stage, the relation between the ROC curves under FD and Half-Duplex (HD) (when SU stops the transmission while sensing the channel). Such relation shows the RSI suppression to be achieved in FD in order to establish an efficient Spectrum Sensing relatively to HD. In the second stage, we deal with the receiver impairments by proposing a new technique to mitigate the NLD of LNA. Our results show the efficiency of this method that can help the Spectrum Sensing to achieve a closed performance under FD to that under HD. Keywords: Full-Duplex · Self-Interference Cancellation · Non-Linearity Distortion · Spectrum Sensing · Cognitive Radio
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Introduction
Recently, the Full Duplex (FD) transmission has been introduced in the context of Cognitive Radio (CR) to enhance the Data-Rate of the Secondary (unlicensed) User (SU). In FD systems, SU can transmit and sense the channel at the same time. Classically, Half Duplex (HD) was used, therefore the SU should stop transmitting to sense the status of the Primary (licensed) User (PU). Recent c ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2016 D. Noguet et al. (Eds.): CROWNCOM 2016, LNICST 172, pp. 363–374, 2016. DOI: 10.1007/978-3-319-40352-6 30
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advancements in the Self-Interference Cancellation (SIC) make the application of FD in CR possible. Due to many imperfections, a perfect elimination of the self-interference cannot be reached in real world applications [1,2]. In CR, the SU makes a decision on the PU status using a Test Statistic (TS) [3]. This TS depends on the PU signal and the noise. Any residual interference from the SU signal can affect the TS norm and leads to a wrong decision about the presence of PU. In wireless systems, the FD is considered as achieved if the Residual Self Interference (RSI) power becomes lower than the noise level. For that an important SIC gain is required (around 110 dB for a typical WiFi system [2]). This gain can be ach
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