Hybrid journal (It can contain Open Access articles) ISSN (Print) 1755-9340 - ISSN (Online) 1755-9359 Published by Inderscience Publishers[443 journals]
Authors:Saqib Ali, Mohammed Al Abri Pages: 281 - 302 Abstract: Cyber physical systems (CPSs) utilised in many of the critical infrastructures including the smart grid. The operational activities of smart grid's CPS use different industrial solution such as industrial control systems (ICS) for monitoring and controlling the physical architecture of smart grid. Therefore, it is quite essential to keep these industrial control systems secure and safe from potential hazards and cyber world as it may be harmful for human safety, strategic infrastructure of a country and also for the economy. The study gathered the scattered guidelines, best practices and policies available from various organisations such as National Institute of Standards and Technology (NIST), ISO, and North American Electric Reliability Corporation (NERC) for the purpose of developing safe and secure ICS security systems and also the knowledge about the issues involved in ICS security and protection. A conceptual framework is proposed and developed to address the shortcomings in-order to protect the ICS systems in a smart grid environment. The proposed framework was developed by reviewing related studies, standards and utilising IT security working experience. This framework will not only expand the horizon of knowledge but also provides pathway for the development of existing activities of CPS applications such as smart grid. Keywords: industrial control systems; ICS; supervisory control and data acquisition; SCADA; cybersecurity; cyber physical systems; CPSs; smart grid Citation: International Journal of Systems, Control and Communications, Vol. 10, No. 4 (2019) pp. 281 - 302 PubDate: 2019-10-02T23:20:50-05:00 DOI: 10.1504/IJSCC.2019.102737 Issue No:Vol. 10, No. 4 (2019)
Authors:Sharanjit Kaur, Inderdeep Kaur Aulakh Pages: 303 - 316 Abstract: In CRNs, the available spectrum has to be shared between various users, OFDM has a feature that supports multiuser access by assigning subcarriers to different users. In wireless transmissions, PAPR is the key challenge in OFDM that affects the BER. In this paper, the main focus is on PTS. The drawback of existing PTS technique is that the number of multiplications of IFFT sub-sequences with the phase vectors required in it are very high. To reduce computational complexity, optimisation is performed. BPSO is used to find optimised phase vector. This phase vector will be one having reduced PAPR. The purpose is to find out the absolute convergence of MIMO multiplexing to reduce the internal phase to phase PAPR in cognitive radio based networks. Results show that in case of PTS-BPSO error reduces at higher rate with less PAPR. BER is reduced at different SNR values as compared to conventional approach. Keywords: orthogonal frequency division multiplexing; OFDM; partial transmit sequence; PTS; binary particle swarm optimisation; BPSO; particle swarm optimisation; PSO; peak-to-average power ratio; PAPR; bit error rate; BER Citation: International Journal of Systems, Control and Communications, Vol. 10, No. 4 (2019) pp. 303 - 316 PubDate: 2019-10-02T23:20:50-05:00 DOI: 10.1504/IJSCC.2019.102738 Issue No:Vol. 10, No. 4 (2019)
Authors:Rittu Angu, R.K. Mehta Pages: 317 - 328 Abstract: An automatic voltage regulator (AVR) design based on symmetric root locus (SRL) technique for a synchronous machine infinite bus (SMIB) power system is presented. The SRL technique is used to minimise the amplifier saturation by placing the closed-loop poles (CLPs) of the system at desired locations. The desired CLPs are decided by considering the dominant pole locations that provide maximum damping on the SRL plot. The design incorporates an extended estimator to deal with uncertainties introduced due to variations of parameters or operating conditions. They reconstruct the state information including the state of disturbance dynamics simultaneous to implement full state feedback and using the reconstructed disturbance estimate to compensate the effect of external disturbance or parameter uncertainties. The performance of the system is analysed through simulating at different operating conditions. The control method improves the tracking response and provides zero estimation error in the steady-state. Illustrative examples have been provided to demonstrate the effectiveness of the developed methodology. Keywords: synchronous machine infinite bus; SMIB; automatic voltage regulator; AVR; symmetric root locus; SRL; extended estimator Citation: International Journal of Systems, Control and Communications, Vol. 10, No. 4 (2019) pp. 317 - 328 PubDate: 2019-10-02T23:20:50-05:00 DOI: 10.1504/IJSCC.2019.102742 Issue No:Vol. 10, No. 4 (2019)
Authors:Mohsen Farhang, Hossein Khaleghi Bizaki Pages: 329 - 337 Abstract: Generalised frequency division multiplexing (GFDM) is a multicarrier transmission scheme that offers a flexible framework to address diverse requirements of fifth generation of cellular networks. Compared to orthogonal frequency division multiplexing (OFDM), the application of pulse shaping in GFDM can control the out of band (OOB) radiation and enables relaxed synchronisation requirements. However, the sub-carriers in GFDM are no longer orthogonal and there is inherent interference. Since this interference is known at the transmitter, it can be mitigated by means of precoding techniques. In this paper, Tomlinson-Harashima precoding (THP) scheme is applied to GFDM transceiver and its performances is compared to previous methods in terms of bit error rate (BER) and peak to average power ratio (PAPR). The results show that the proposed precoder outperforms previous methods in both BER and PAPR. Keywords: generalised frequency division multiplexing; GFDM; precoding technique; non-orthogonal waveform; self-interference Citation: International Journal of Systems, Control and Communications, Vol. 10, No. 4 (2019) pp. 329 - 337 PubDate: 2019-10-02T23:20:50-05:00 DOI: 10.1504/IJSCC.2019.102743 Issue No:Vol. 10, No. 4 (2019)
Authors:Muthukumar Arunachalam, Sivasankari Narasimhan, Rampriya Kaniram Pages: 338 - 355 Abstract: A tetrahedral oscillator-based true random number generator for secret key generation in cryptosystem has been proposed. The circuit is made to behave correctly for a long time. By applying pass transistors, the aging effects due to hot carrier injection (HCI) and negative bias temperature instability (NBTI) are reduced. This fact is helpful to achieve the goal and its performances have also been improved. Pass transistor makes the transistors to operate only at enabling times. Thus, bit flipping in normal designs are reduced. Due to the complexity in the tetrahedral oscillator hacking will be very tough. The secret key generated from TRNG circuit is adopted in advanced encryption standard (AES) cryptosystem to maintain an off-chip database. Moreover, controlling circuits for TRNG have been introduced because in any of the cryptosystem man-in-middle attack is possible. To avoid this controlling circuits are used to identify the authenticity of customers. Simulation results explain that our aging resistant design can be used for generating more reliable keys. Although the operating conditions changes, the DC operating point of the system does not change more. The randomness is also shown through NIST tests. Keywords: aging; advanced encryption standard; AES; cryptosystem; personality ID; TRNG; hash function; tetra hedral oscillator; sampling; pass transistors; operating point Citation: International Journal of Systems, Control and Communications, Vol. 10, No. 4 (2019) pp. 338 - 355 PubDate: 2019-10-02T23:20:50-05:00 DOI: 10.1504/IJSCC.2019.102744 Issue No:Vol. 10, No. 4 (2019)
Authors:Kaoutar Lahmadi, Abderrahim El-Amrani, Bensalem Boukili, Ismail Boumhidi Pages: 356 - 374 Abstract: In this paper, the H<SUB align="right"> filtering problem for a class of continuous-time polytopic uncertain systems is studied. Different from the traditional methods dealing with polytopic uncertainties in the full frequency domain, not only its values but also the finite frequency (FF) cases are considered. Our goal is to design the filters guaranteeing an H<SUB align="right"> performance level in the finite frequency (FF) domains. By using the generalised Kalman-Yakubovich-Popov (gKYP) lemma, polynomially parameter-dependent Lyapunov function and some key matrices, we establish new sufficient conditions to characterise this problem in terms of linear matrix inequalities (LMIs). Finally, a two examples are used to show the superiority and effectiveness of the proposed methods. Keywords: finite frequency; H? performance; continuous-time systems; linear matrix inequalities; LMIs Citation: International Journal of Systems, Control and Communications, Vol. 10, No. 4 (2019) pp. 356 - 374 PubDate: 2019-10-02T23:20:50-05:00 DOI: 10.1504/IJSCC.2019.102745 Issue No:Vol. 10, No. 4 (2019)
Hybrid journal (It can contain Open Access articles)
