3 research outputs found
SPRT Based Transceiver for Molecular Communications
Achieving precise synchronisation between transmitters and receivers is
particularly challenging in diffusive molecular communication environments. To
this end, point-to-point molecular communication system design is examined
wherein synchronisation errors are explicitly considered. Two transceiver
design questions are considered: the development of a sequential probability
ratio test-based detector which allows for additional observations in the
presence of uncertainty due to mis-synchronisation at the receiver, and a
modulation design which is optimised for this receiver strategy. The modulation
is based on optimising an approximation for the probability of error for the
detection strategy and directly exploits the structure of the probability of
molecules hitting a receiver within a particular time slot. The proposed
receiver and modulation designs achieve strongly improved asynchronous
detection performance for the same data rate as a decision feedback based
receiver by a factor of 1/2
Optimal Detection Interval for Absorbing Receivers in Molecular Communication Systems with Interference
We consider a molecular communication system comprised of a transmitter, an
absorbing receiver, and an interference source. Assuming amplitude modulation,
we analyze the dependence of the bit error rate (BER) on the detection
interval, which is the time within one transmission symbol interval during
which the receiver is active to absorb and detect the number of
information-carrying molecules. We then propose efficient algorithms to
determine the optimal detection interval that minimizes the BER of the
molecular communication system assuming no inter-symbol interference (ISI).
Simulation and numerical evaluations are provided to highlight further insights
into the optimal results. For example, we demonstrate that the optimal
detection interval can be very small compared to the transmission symbol
interval. Moreover, our numerical results show that significant BER
improvements are achieved by using the optimal detection interval for systems
without and with ISI.Comment: 14 pages, 10 figures, submitted to IEEE for possible publicatio
Towards High Data-Rate Diffusive Molecular Communications: Performance Enhancement Strategies
Diffusive molecular communications (DiMC) have recently gained attention as a
candidate for nano- to micro- and macro-scale communications due to its
simplicity and energy efficiency. As signal propagation is solely enabled by
Brownian motion mechanics, DiMC faces severe inter-symbol interference (ISI),
which limits reliable and high data-rate communications. Herein, recent
literature on DiMC performance enhancement strategies is surveyed; key research
directions are identified. Signaling design and associated design constraints
are presented. Classical and novel transceiver designs are reviewed with an
emphasis on methods for ISI mitigation and performance-complexity tradeoffs.
Key parameter estimation strategies such as synchronization and channel
estimation are considered in conjunction with asynchronous and timing error
robust receiver methods. Finally, source and channel coding in the context of
DiMC is presented.Comment: 19 pages, 15 figure