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This paper presents the performance evaluation of a common signal employed to enable coexistence between heterogeneous physical (PHY) layer designs in the Smart Utility Networks (SUNs). The coexistence mechanism, known as Multi-PHY Management (MPM) uses a common PHY signaling specification known as the Common Signaling Mode (CSM) to facilitate interference avoidance/mitigation among the three specified...
An adaptive power control scheme for cognitive radio system (CRS) in Rayleigh fading channel is proposed. The transmit power of a secondary user (SU) is adjusted in Rayleigh fading to maximize the constant output signal-to-noise ratio (SNR) at an SU receiver while keeping the interference to a primary user (PU) under given constraints. To calculate the maximum constant output SNR at the SU receiver...
In this paper we investigate spectrum sensing for cognitive radio (CR) by using multiple spectrum sensors. We explore sensing schemes based on soft information combining, hard information combining and a two-stage detection scheme that uses both soft information combining and hard information combining. The two-stage detection scheme is shown to provide improved performance compared to sensing based...
AbstraAbThis study addresses detection of primary users (PUs) for cognitive radio system (CRS) with distributed spectrum sensors (DSSs) in Rayleigh fading environment. Two sensing schemes using DSSs that employ energy detection (ED) are investigated as cooperative sensing and collaborative sensing. For the cooperative sensing, each DSS makes hard decision after sensing and transmits the information...
The frame splitting (FS) for the downlink transmission from a base station (BS) with distributed antennas to a mobile station is studied. A data frame from the BS is split into two portions that are transmitted consecutively from the distributed antennas. For uncoded transmission, the bit error rate (BER) is formulated as a function of the FS ratios, and an analytical optimal FS ratios is derived...
A power allocation in a coded cooperation is investigated. For given a total transmit power, an optimal transmit power ratio is obtained in a sense that the average received signal-to-noise ratio (SNR) from the source node and that from the relay node are equal at the sink node. Simulation for a rate compatible punctured convolutional (RCPC) code-based cooperation shows that the power allocation with...
The function of a cognitive radio system (CRS) can be classified as cognitive engine (CE) and sensing. The CE fulfills spectrum analysis and decision making of spectrum access. The sensing function is realized by either a CR node or distributed spectrum sensors. In this paper, we propose a sensing architecture, which adds new functional entities, sensing controller (SC) and sensing information processor...
Recent studies on spectrum sensing for cognitive radio (CR) reveal that sensing based on single CR may not provide reliable information due to the fact that signals degrade as a result of fading and shadowing. Hence, spectrum sensing based on multiple CR has been considered. In this paper we investigate a distributed sensing based on multiple spectrum sensors where the sensors are located outside...
A cognitive radio system (CRS) senses the radio spectrum environment and adaptively use unoccupied spectrum resource. The CRS should optimize between two conflicting goals for different applications. One is the minimization of interference to primary users and the other is the maximization of usage of spectrum opportunities of the secondary users. In this paper, we propose a dual-level management...
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