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In this paper, we consider two uncoordinated and geographically overlapping Cognitive Radio (CR) networks coexisting together with Primary User (PU) networks. One of the CR networks, the Cognitive Gateway Network (CGN) has higher priority to access the spectrum than the other CR network. We study the achievable rates of both CR networks. The achievable data rate per-node is derived analytically considering...
The aim of this paper is to study the achievable throughput of an ad hoc Device-to-Device (D2D) communications with cognitive radio capabilities coexisting with cellular user equipment (UE) in the same macrocell. Specifically, we consider ad hoc D2D systems with non-orthogonal resources sharing instead of D2D with infrastructure support. The main objective is to find out how much throughput a device...
In this paper, we examine performance management for cognitive radio (CR) ad hoc networks, and address the problem of data link congestion for secondary users. Our approach is to propose a metric based on the probability of contended link access and the probability of packet error to identify potential congestion on those links. We consider this metric in the context of a dynamic spectrum environment...
In decentralized Cognitive Radio (CR) networks timing errors between secondary users cause increased interference during sensing periods. This kind of intra-network interference inflicts significant performance degradation due to the growth of false alarm probabilities if energy-based incumbent detection is used, as shown in our previous study. Therefore, in this paper we propose a novel interference...
Spectrum under-utilization calls for the open and dynamic spectrum access mechanism, which allows the unlicensed user equipped with cognitive radios to opportunistically sense and access the spectrum that not occupied by primary users. In practice due to the hardware limitations, each cognitive radio user may be only able to sense a portion of the interested wide span spectrum. Hence, a hardware-constrained...
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