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In cognitive radio (CR) networks, unlicensed users known as secondary users (SUs) can share the same spectrum with the licensed users known as primary users (PUs) on condition that the SUs interference must not exceed a certain level on PUs. Our target is to provide the SUs with a minimum acceptable quality-of-service (QoS), while keeping the interference to the PUs below a given threshold. However,...
Spectrum sensing has been identified as a key enabling functionality to ensure that cognitive radios would not interfere with the primary user, which are the Digital Video Broadcasting — Terrestrial (DVB-T) receivers. This paper deals with spectrum sensing techniques used for efficient utilization of the limited spectrum resources. The most used technique is the energy detection (ED) as it is the...
Cognitive Radio (CR) is one of the principal technologies aiming to overcome the scarcity of the spectrum. Some cognitive radio scenarios enable the secondary users to coexist with spectrum owner (licensee) on the same frequency band. This paper studies the existence of secondary users on the same channel of a broadcast primary user system where the transmission of the primary user's transmitter covers...
Cognitive radio (CR) permits multiple unlicensed users, secondary users, to share the same channels with the licensed users, primary users, without affecting the latter performance. The main challenge resides in the design of the secondary users' transceivers (precoding, postcoding, and power allocation) such that both the primary and secondary receivers enjoy satisfactory quality of service (QoS)...
New interference alignment (IA) design for secondary users' transceivers in multi-secondary users cognitive radio system is presented. The proposed scheme allows opportunistic transmitters (secondary users) equipped with multiple antennas (MIMO) to use the same frequency band already occupied by the pre-existing primary user. This can be done by aligning and cancelling the interference on the primary...
Spectrum sensing has been identified as a key enabling functionality to ensure that cognitive radios would not interfere with the primary users, by reliably detecting primary user signal. In this paper, the primary user signal is wireless microphone (WM) signal. The power of the WM signal is highly concentrated in the frequency domain. Due to this property, we focus on spectrum sensing in the frequency...
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