In a communication system there are three fundamental resources : signal power, time and bandwidth. These resources can be traded against each other depending on the premium attached to each resource in a given situation. The general objective is achieve maximum data transfer, in a minimum bandwidth, while maintaining an acceptable quality of service. In digital communication the quality of ser...

Distributed bisimilarity is one of non-interleaving equivalences studied on concurrent systems; it refines the classical bisimilarity by taking also the spatial distribution of (sub)components into account. In the area of verification of infinite-state systems, one of the simplest (most basic) classes is the class of Basic Parallel Processes (BPP); here distributed bisimilarity is known to coin...

Power line communications (PLC), thanks to the widespread availability of power line infrastructure, is considered as a low-cost alternative for data transmission. Power lines, however, remain hostile environments for communication signal propagation. In this paper, we propose a new transceiver scheme for orthogonal frequency division multiplexing (OFDM)-based broadband power line communication...

The multi-carrier code division multiple access (MCCDMA) is a attractive choice for the future wireless systems where multiplexing and diversity in space, time and frequency are joined together through multiple input multiple output (MIMO) and space time block coding (STBC) in order to increase user capacity. In this study, the orthogonal complete complementary (OCC) spreading codes are employe...

The demand for higher communication data rates is immense in the era of high quality multimedia content. The issue at hand is to increase data transfer rates while improving error tolerance levels. Turbo codes unleashed a research renaissance on near Shannon-limit codes, where formerly no significant improvements had been achieved. Unequal Error Protection (UEP) optimizes the already powerful c...

Variable bit rate real-time multimedia services like highly compressed video or audio tend to be very sensitive to transmission errors. This paper investigates cell and frame loss as well as delay and timing issues in an ATM-based B-ISDN environment that carries such services. The figures derived through simulation using artificial as well as real world sources motivate the introduction of forw...

Suppose we have n algorithms, quantum or classical, each computing some bit-value with bounded error probability. We describe a quantum algorithm that uses O( √ n) repetitions of the base algorithms and with high probability finds the index of a 1-bit among these n bits (if there is such an index). This shows that it is not necessary to first significantly reduce the error probability in the ba...

A design of rate-compatible polar codes suitable for HARQ communications is proposed in this paper. An important feature of the proposed design is that the puncturing order is chosen with low complexity on a base code of short length, which is then further polarized to the desired length. A practical ratematching system that has the flexibility to choose any desired rate through puncturing or r...