Fast Cooperative Energy Detection under Accuracy Constraints in Cognitive Radio Networks

Abstract

Cooperative energy detection (CED) is a key technique to identify the spectrum holes in cognitive radio networks. Previous study on this technique mainly aims at improving the detection accuracy, while paying little attention to the performance of detection time. This paper concentrates on the issue of fast CED, which is achieved by minimizing its detection time subject to the constraints on detection accuracy. Firstly, the prevalent counting rule based CED algorithm is optimized. Taking the special cases of counting rule (AND rule and OR rule), for example, we show that detection time can be minimized by selecting an optimal number of secondary users. Moreover, we prove that OR rule is superior to AND rule in detection time, and thus OR rule based CED is faster than AND rule based CED. Then, a sequential test (ST) based CED algorithm is proposed to exploit the benefit of ST and detect primary user even faster. After analyzing its detection time, we illustrate that ST based CED is able to spend the minimal detection time in satisfying the accuracy constraints by choosing an optimal sample number. Simulation results are provided to verify the effectiveness of both fast algorithms discussed in this paper.

BLSBA‐ED‐SSO: Bivariate Lévy‐stable bat algorithm‐based energy detection for spectrum sensing optimization in cognitive radio networks (CRNs)

“…The time needed by fusion step is specified by T f = mRT . Accordingly, the time of ED can be defined as …”

Reuse of Byzantine data in cooperative spectrum sensing using sequential detection

“…P m, 1 = P m, 2 = ⋯ = P m, i = P m, N = P m , P f, 1 = P f, 2 = ⋯ = P f, i = ⋯ = P f, N = P f , otherwise, the detection probability P d = 1 − P m . In order to avoid consuming too much spectrum resource, multiple SUs usually access the control channel in time division multiple access mode, and their local reports need to be collected one by one not in parallel [29].…”

Sum Rate Maximization of D2D Communications in Cognitive Radio Network Using Cheating Strategy

“…Specifically, there are two modes of sharing the spectral resources, that is, overlay and underlay. In the overlay mode, secondary users firstly need to sense spectrum holes, which means the temporarily unused channels, and then commence real transmissions [3]. On the other hand, if the channel gains between the primary and secondary users are sufficiently small so that both sides are able to successfully convey their signals, this situation is also acceptable in CR networks, which is named underlay mode [4].…”