  Molecular communication has a key role to play in future medical
applications, including detecting, analyzing, and addressing infectious disease
outbreaks. Overcoming inter-symbol interference (ISI) is one of the key
challenges in the design of molecular communication systems. In this paper, we
propose to optimize the detection interval to minimize the impact of ISI while
ensuring the accurate detection of the transmitted information symbol, which is
suitable for the absorbing and passive receivers. For tractability, based on
the signal-to-interference difference (SID) and
signal-to-interference-and-noise amplitude ratio (SINAR), we propose a
modified-SINAR (mSINAR) to measure the bit error rate (BER) performance for the
molecular communication system with a variable detection interval. Besides, we
derive the optimal detection interval in closed form. Using simulation results,
we show that the BER performance of our proposed mSINAR scheme is superior to
the competing schemes, and achieves similar performance to optimal intervals
found by the exhaustive search.
