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- Mojtaba Rahmati, Tolga M. Duman
- ArXiv
- 2011

- Mojtaba Rahmati, Tolga M. Duman
- IEEE Transactions on Information Theory
- 2013

We develop several analytical lower bounds on the capacity of binary insertion and deletion channels by considering independent uniformly distributed (i.u.d.) inputs and computing lower bounds on the mutual information between the input and output sequences. For the deletion channel, we consider two different models: i.i.d. deletion-substitution channel and… (More)

- Mojtaba Rahmati, Tolga M. Duman
- IEEE Transactions on Information Theory
- 2015

We study memoryless channels with synchronization errors as defined by a stochastic channel matrix allowing for symbol drop-outs or symbol insertions with particular emphasis on the binary and non-binary deletion channels. We offer a different look at these channels by considering equivalent models by fragmenting the input sequence where different… (More)

- Mojtaba Rahmati, Tolga M. Duman
- IEEE Trans. Wireless Communications
- 2014

In cooperative UWA systems, due to the low speed of sound, a node can experience significant time delays among the signals received from geographically separated nodes. One way to combat the asynchronism issues is to employ orthogonal frequency division multiplexing (OFDM)-based transmissions at the source node by preceding every OFDM block with an… (More)

- Mojtaba Rahmati, Tolga M. Duman
- IEEE Trans. Communications
- 2014

We develop several lower bounds on the capacity of binary input symmetric output channels with synchronization errors which also suffer from other types of impairments such as substitutions, erasures, additive white Gaussian noise (AWGN) etc. More precisely, we show that if the channel with synchronization errors can be decomposed into a cascade of two… (More)

- Mojtaba Rahmati, Tolga M. Duman
- 2013 IEEE International Symposium on Information…
- 2013

We derive an upper bound on the capacity of non-binary deletion channels. Although binary deletion channels have received significant attention over the years, and many upper and lower bounds on their capacity have been derived, such studies for the non-binary case are largely missing. The state of the art is the following: as a trivial upper bound,… (More)

- Paolo Chierigo, Oliviero Puccetti, +4 authors Nicola Franzolin
- Urologia
- 2010

BACKGROUND
The following report describes a case of inherited elevation of alpha-fetoprotein (AFP) in a young male suspected for testicular cancer. AFP shows very high values during fetal life. After birth the synthesis of AFP decreases dramatically, and only trace amounts are detected in the adult. From this age on, serum AFP can rise above normal in some… (More)

- Mojtaba Rahmati, Tolga M. Duman
- ArXiv
- 2012

Memoryless channels with deletion errors as defined by a stochastic channel matrix allowing for bit drop outs are considered in which transmitted bits are either independently deleted with probability d or unchanged with probability 1 − d. Such channels are information stable, hence their Shannon capacity exists. However, computation of the channel capacity… (More)

- Mojtaba Rahmati, Tolga M. Duman
- 2013 51st Annual Allerton Conference on…
- 2013

In this paper, we offer an alternative look at channels with deletion errors by considering equivalent models for deletion channels by “fragmenting” the input sequence where different subsequences travel through different channels. The resulting output symbols are combined appropriately to come up with an equivalent input-output representation… (More)

- Mojtaba Rahmati, Tolga M. Duman
- GLOBECOM
- 2011