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Adaptive processing in overlay networks for performance improvement

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Abstract

This paper proposes an overlay network wherein a pair of licensed source (LS) and licensed destination (LD) is adaptively assisted by a pair of unlicensed source (US) and unlicensed destination (UD). By processing adaptively at US and UD relied on the decoding statuses of LD and US, licensed communication is always supported with a high diversity gain from which unlicensed communication also benefits from removing licensed interference as well as transmitting with the highest available power, eventually improving reliability of both unlicensed and licensed communication. This paper also proposes closed-form formulas of outage probabilities at LD and UD for prompt reliability evaluation over \(\kappa -\mu \) shadowed fading channels. Multiple results illustrate the superiority of the proposed adaptive processing scheme as compared to its counterpart. Further, the reliability of the suggested scheme can be flexibly controlled and optimized with setting specifications reasonably.

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Notes

  1. Recent advances in self-interference cancellation enable UD to accomplish about 80-110 dB of self-interference suppression [31]. Accordingly, \(\eta \) is very small.

  2. The current paper supposes the case that \(UD \) implements restoring \(x_s\) merely if it has restored exactly \(x_p\). The criterion to assure whether \(UD \) has decoded correctly \(x_p\) is described in the subsequent section. Thence, the residual licensed interference remained after removing \(x_p\) out of \(UD \)’s received signal is negligible.

  3. To mitigate case-studies without loss of generality, an identical shadowed fading parameter set - (\(\mu _{\textsf {uv}}=\mu \), \(m_{\textsf {uv}}=m\), \(\kappa _{\textsf {uv}}=\kappa \)) - for any channel is studied in the sequel.

  4. Diversity order is defined as the slope of the outage probability curve.

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Acknowledgements

We acknowledge Ho Chi Minh City University of Technology (HCMUT), VNU-HCM for supporting this study.

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Authors and Affiliations

  1. Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh, Vietnam

    Toi Le-Thanh & Khuong Ho-Van

  2. Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh, Vietnam

    Toi Le-Thanh & Khuong Ho-Van

  3. Ho Chi Minh City University of Food Industry, 140 Le Trong Tan Street, Tay Thanh Ward, Tan Phu District, Ho Chi Minh, Vietnam

    Toi Le-Thanh

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  1. Toi Le-Thanh
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Correspondence to Khuong Ho-Van.

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Le-Thanh, T., Ho-Van, K. Adaptive processing in overlay networks for performance improvement. Wireless Netw 28, 3639–3652 (2022). https://doi.org/10.1007/s11276-022-03089-4

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