Abstract
Wireless communication using existing coding models poses several challenges for RF signals due to multipath scattering, rapid fluctuations in signal strength and path loss effect. Unlike existing works, this study presents a novel coding technique based on Analogue Network Coding (ANC) in conjunction with Space Time Block Coding (STBC), termed as Space Time Analogue Network Coding (STANC). STANC achieves the transmitting diversity (virtual MIMO) and supports big data networks under low transmitting power conditions. Furthermore, this study evaluates the impact of relay location on smart devices network performance in increasing interfering and scattering environments. The performance of STANC is analyzed for Internet of Things (IoT) applications in terms of Symbol Error Rate (SER) and the outage probability that are calculated using analytical derivation of expression for Moment Generating Function (MGF). In addition, the ergodic capacity is analyzed using mean and second moment. These expressions enable effective evaluation of the performance and capacity under different relay location scenario. Different fading models are used to evaluate the effect of multipath scattering and strong signal reflection. Under such unfavourable environments, the performance of STANC outperforms the conventional methods such as physical layer network coding (PNC) and ANC adopted for two way transmission.
Highlights
The future of Internet of Things (IoT) encompasses a much broader range of applications
An innovative network coding strategy i.e. Space Time Analog Network Coding (STANC) is introduced for wireless environment in order to compensate the effect of Multipath scattering and path loss by achieving the spatial diversity and improved performance as compared to conventional physical layer network coding (PNC) and direct transmission schemes that are designed for IoT applications
We present an ergodic capacity of Space Time Analogue Network Coding (STANC) channel approximated by a Gaussian random variable assuming that channel state information (CSI) is only available at the receiver and transmitter have no knowledge of channel
Summary
The future of IoT encompasses a much broader range of applications. This technology is bringing innovation in conventional telecommunication facilities like speech, video, web browsing, social networking, etc., Authors in [1] present a survey report regarding state-of-the-art of 5G IoT, they only provide a review on research trends and challenges faced by 5G IoT. Cooperative network concepts have been an important area of research to combat channel fading, where signal transmissions between communicating terminals are assisted by one or more co-operative relays [5], [6]. An innovative network coding strategy i.e. Space Time Analog Network Coding (STANC) is introduced for wireless environment in order to compensate the effect of Multipath scattering and path loss by achieving the spatial diversity and improved performance as compared to conventional PNC and direct transmission schemes that are designed for IoT applications. The effective closed-form expressions for moment generating function (MGF), mean and second moment is derived for performance metrics SER, outage and capacity under realistic propagation scenario over Rayleigh, Nakagami and Rician fading channels that incorporate the multipath scattering and path loss effect. Ti and Rj denote the i-th terminal and j-th relay, respectively
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