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Papers by Balaji Dhayabaran

IET Communications

Internet‐of‐things is an enabling technology in the fourth‐generation industrial revolution. The ... more Internet‐of‐things is an enabling technology in the fourth‐generation industrial revolution. The freshness of the data sent by a sensor node (SN) is an important parameter in the Internet‐of‐things, unlike the throughput in cellular communications. A relatively new performance metric named age of information (AoI) is used in this paper to quantify the freshness of the data. The SN, located in the transport infrastructure, harvests energy from radio frequency signals transmitted by the FD‐UAV. This is used to transmit real‐time sensor observations to the data sink via FD‐UAV. The SN generates an update after replenishing the battery and transmits it by using the harvested energy. A closed‐form expression for average AoI is derived as a function of time allocated for energy harvesting. The optimal time allocation for energy harvesting that maximizes the freshness of data update is identified. A deep learning technique namely long‐short term memory is used to predict the average AoI. S...

In this paper we prove that Inter-Symbol Interference (ISI) and Bit Error Rate (BER) of a Diffusi... more In this paper we prove that Inter-Symbol Interference (ISI) and Bit Error Rate (BER) of a Diffusion Based Molecular Communication (DBMC) system depend on the apriori probability of the transmitted data by deriving lower and upper bounds for the number of received molecules. We also compute the optimal value of a-priori probability for which ISI and BER are minimized. A source coding technique, called Modified Inverse Source Coding (MISC), is proposed that allows to control the a-priori probability of the transmitted data. The results show that the MISC-DBMC system not only provides a better BER performance compared to an uncoded one but also improves the range of communication. Index Terms-Diffusive channel, molecular communication, inverse source coding, inter-symbol interference, bit error rate.

IEEE internet of things magazine, Mar 1, 2022

IEEE Wireless Communications Letters, Jul 1, 2021

The nano size of the molecular transmitter limits it from storing or releasing a large number of ... more The nano size of the molecular transmitter limits it from storing or releasing a large number of molecules instantaneously. This physical constraint makes instantaneous release of molecules from the transmitter infeasible. In this letter, we model the molecule emission process more accurately using rectangular and exponential transmit signals and derive closed form expressions for the number of molecules that are absorbed by the receiver in a Diffusion-Based Molecular Communication (DBMC) system. We show that the effect of inter symbol interference (ISI) depends on the shape of the transmit signal. Also, we design an optimal transmit signal with minimum inter symbol interference effect using the least squares approach. Moreover, the bit error rate performance of the DBMC system is analyzed for different transmit signals compared to that of the ideal system with instantaneous release of molecules. The match between analytical expressions and particle-based simulations is shown.

IEEE Internet of Things Magazine

SSRN Electronic Journal, 2022

IEEE Transactions on Molecular, Biological, and Multi-Scale Communications, 2021

2020 IEEE 21st International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), 2020

In this paper we prove that Inter-Symbol Interference (ISI) and Bit Error Rate (BER) of a Diffusi... more In this paper we prove that Inter-Symbol Interference (ISI) and Bit Error Rate (BER) of a Diffusion Based Molecular Communication (DBMC) system depend on the a-priori probability of the transmitted data by deriving lower and upper bounds for the number of received molecules. We also compute the optimal value of a-priori probability for which ISI and BER are minimized. A source coding technique, called Modified Inverse Source Coding (MISC), is proposed that allows to control the a-priori probability of the transmitted data. The results show that the MISC-DBMC system not only provides a better BER performance compared to an uncoded one but also improves the range of communication.

The nano size of the molecular transmitter limits it from storing or releasing a large number of ... more The nano size of the molecular transmitter limits it from storing or releasing a large number of molecules instantaneously. This physical constraint makes instantaneous release of molecules from the transmitter infeasible. In this letter, we model the molecule emission process more accurately using rectangular and exponential transmit signals and derive closed form expressions for the number of molecules that are absorbed by the receiver in a Diffusion-Based Molecular Communication (DBMC) system. We show that the effect of inter symbol interference (ISI) depends on the shape of the transmit signal. Also, we design an optimal transmit signal with minimum inter symbol interference effect using the least squares approach. Moreover, the bit error rate performance of the DBMC system is analyzed for different transmit signals compared to that of the ideal system with instantaneous release of molecules. The match between analytical expressions and particle-based simulations is shown.

IET Communications

Internet‐of‐things is an enabling technology in the fourth‐generation industrial revolution. The ... more Internet‐of‐things is an enabling technology in the fourth‐generation industrial revolution. The freshness of the data sent by a sensor node (SN) is an important parameter in the Internet‐of‐things, unlike the throughput in cellular communications. A relatively new performance metric named age of information (AoI) is used in this paper to quantify the freshness of the data. The SN, located in the transport infrastructure, harvests energy from radio frequency signals transmitted by the FD‐UAV. This is used to transmit real‐time sensor observations to the data sink via FD‐UAV. The SN generates an update after replenishing the battery and transmits it by using the harvested energy. A closed‐form expression for average AoI is derived as a function of time allocated for energy harvesting. The optimal time allocation for energy harvesting that maximizes the freshness of data update is identified. A deep learning technique namely long‐short term memory is used to predict the average AoI. S...

In this paper we prove that Inter-Symbol Interference (ISI) and Bit Error Rate (BER) of a Diffusi... more In this paper we prove that Inter-Symbol Interference (ISI) and Bit Error Rate (BER) of a Diffusion Based Molecular Communication (DBMC) system depend on the apriori probability of the transmitted data by deriving lower and upper bounds for the number of received molecules. We also compute the optimal value of a-priori probability for which ISI and BER are minimized. A source coding technique, called Modified Inverse Source Coding (MISC), is proposed that allows to control the a-priori probability of the transmitted data. The results show that the MISC-DBMC system not only provides a better BER performance compared to an uncoded one but also improves the range of communication. Index Terms-Diffusive channel, molecular communication, inverse source coding, inter-symbol interference, bit error rate.

IEEE internet of things magazine, Mar 1, 2022

IEEE Wireless Communications Letters, Jul 1, 2021

The nano size of the molecular transmitter limits it from storing or releasing a large number of ... more The nano size of the molecular transmitter limits it from storing or releasing a large number of molecules instantaneously. This physical constraint makes instantaneous release of molecules from the transmitter infeasible. In this letter, we model the molecule emission process more accurately using rectangular and exponential transmit signals and derive closed form expressions for the number of molecules that are absorbed by the receiver in a Diffusion-Based Molecular Communication (DBMC) system. We show that the effect of inter symbol interference (ISI) depends on the shape of the transmit signal. Also, we design an optimal transmit signal with minimum inter symbol interference effect using the least squares approach. Moreover, the bit error rate performance of the DBMC system is analyzed for different transmit signals compared to that of the ideal system with instantaneous release of molecules. The match between analytical expressions and particle-based simulations is shown.

IEEE Internet of Things Magazine

SSRN Electronic Journal, 2022

IEEE Transactions on Molecular, Biological, and Multi-Scale Communications, 2021

2020 IEEE 21st International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), 2020

In this paper we prove that Inter-Symbol Interference (ISI) and Bit Error Rate (BER) of a Diffusi... more In this paper we prove that Inter-Symbol Interference (ISI) and Bit Error Rate (BER) of a Diffusion Based Molecular Communication (DBMC) system depend on the a-priori probability of the transmitted data by deriving lower and upper bounds for the number of received molecules. We also compute the optimal value of a-priori probability for which ISI and BER are minimized. A source coding technique, called Modified Inverse Source Coding (MISC), is proposed that allows to control the a-priori probability of the transmitted data. The results show that the MISC-DBMC system not only provides a better BER performance compared to an uncoded one but also improves the range of communication.

The nano size of the molecular transmitter limits it from storing or releasing a large number of ... more The nano size of the molecular transmitter limits it from storing or releasing a large number of molecules instantaneously. This physical constraint makes instantaneous release of molecules from the transmitter infeasible. In this letter, we model the molecule emission process more accurately using rectangular and exponential transmit signals and derive closed form expressions for the number of molecules that are absorbed by the receiver in a Diffusion-Based Molecular Communication (DBMC) system. We show that the effect of inter symbol interference (ISI) depends on the shape of the transmit signal. Also, we design an optimal transmit signal with minimum inter symbol interference effect using the least squares approach. Moreover, the bit error rate performance of the DBMC system is analyzed for different transmit signals compared to that of the ideal system with instantaneous release of molecules. The match between analytical expressions and particle-based simulations is shown.