On the Bit Error Probability and the Spectral Efficiency of Opportunistic Wireless Transmissions in Rician Fading Channels
| Autor: | Henry Ramiro Carvajal Mora, Fernando Dario Almeida Garcia, Carlos Daniel Altamirano, Nathaly Veronica Orozco Garzon |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
modulations
General Computer Science Computer science Opportunistic system 02 engineering and technology 03 medical and health sciences 0302 clinical medicine Signal-to-noise ratio Rician fading 0202 electrical engineering electronic engineering information engineering Wireless General Materials Science Fading Rician fading channel bit error probability Computer Science::Information Theory business.industry General Engineering 020206 networking & telecommunications Spectral efficiency spectral efficiency Computer Science::Performance Cognitive radio Transmission (telecommunications) lcsh:Electrical engineering. Electronics. Nuclear engineering business Algorithm lcsh:TK1-9971 030217 neurology & neurosurgery Communication channel |
| Zdroj: | IEEE Access, Vol 9, Pp 49267-49280 (2021) |
| ISSN: | 2169-3536 |
| Popis: | Opportunistic systems take advantage of the wireless communication channel random behavior, since transmission is made only when fading amplitude is above a threshold value, which is calculated based on a transmission probability. This type of transmission draws attention because improves the system performance, and it is an interesting scheme for primary users in cognitive radio networks or is also an option for physical layer security. In this paper, we analyze the performance of opportunistic transmissions in Rician fading channels considering square-quadrature-amplitude-modulation (S-QAM) and non-square-quadrature-amplitude-modulation (NS-QAM). Exact closed-form expressions and approximations are derived to evaluate the average bit error probability (ABEP). An expression to calculate the mean spectral efficiency (SE) is also derived considering that a target ABEP must be guaranteed. The SE is calculated using the coverage radius obtained for each modulation used in the system. Hence, an algorithm for the radii calculation is also presented, which considers that the parameters of the Rician fading channel change in the cellular area. The results show that opportunistic transmission (OpT) mitigates the fading effects once the ABEP decays exponentially as the signal to noise ratio (SNR) is increased. Additionally, the proposed algorithm, along with the derived expressions, determine the scenarios where the SE is maximized. |
| Databáze: | OpenAIRE |
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