Abstract
In this paper, the performance of a multi-hop underlay cognitive radio network (UCRN) is thoroughly assessed. The co-existence of a primary transceiver and co-channel interference (CCI) is considered along with an uplink single-input multiple-output system utilizing selection combining and maximal ratio combining techniques at the receiver nodes. First, the equivalent per-hop signal-to-interference-plus-noise ratio (SINR) for the UCRN is formulated. Second, the exact cumulative distribution function (CDF) and the probability distribution function of the per-hop SINR are derived and discussed. Furthermore, approximate expressions exhibiting reduced complexity for the per hop equivalent CDF are derived to provide more insights. From the resulting CDF, the exact outage performance of the CR network is thoroughly assessed. In addition, mathematical formulas are derived for the average error probability and system ergodic capacity. Finally, the derived analytical expressions are validated by presenting numerical and simulation results for different network parameters. The results show that several factors contribute to the degradation of the system performance, namely, the interference power constraint, the primary transmitter power, and the presence of CCI, especially in the case where the CCI increases linearly with the secondary transmission powers.
Highlights
T HE radio spectrum is a crucial resource that exists for all wireless communication purposes
It is shown that the co-channel interference (CCI) consideration is severely degrading the performance of the secondary network, especially when its power is considered as linearly increasing with the secondary transmission powers
A more practical case scenario was assumed through the consideration of CCI in addition to the primary transmitter interference on the secondary network
Summary
T HE radio spectrum is a crucial resource that exists for all wireless communication purposes. Different scenarios of the cooperative network have been thoroughly investigated, (see for example [3], [4] and references therein) It is well-known that employing a multi-antenna scheme in a wireless communication network has the advantage of improvement in the system performance, such as better spectral and power efficiency [5]. SC is a technique of choosing the best available link, among the possible links between the transmit and receive nodes, that has the highest instantaneous signal-to-noise-ratio (SNR) [7] It leads to keeping the benefits of the multiantenna scheme and reducing the hardware cost [8], [9]. It is important to investigate the impact of such interference on the performance characteristics of an underlay CR network
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