| In this paper we consider an asyn-chronous direct-sequence code division multiple access (DS-CDMA) communication system operating over an AWGN channel. In certain applications , the near-far problem can be the limiting factor for the capacity of a DS-CDMA system. Several near-far resistant receivers have therefore been proposed (e.g., the decorrelat-ing receiver). These receivers assume perfe...

Abstmct Satellite networks provide global coverage and support a wide range of services. Low Earth Orbit (LEO) satellites provide short round trip delays and are becoming increasingly important. One of the challenges in LEO satellite networks is the development of specialized and efflcient routing algorithms. In this work, a datagram routing algorithm for LEO satellite networks is introduced. T...

This study extends the analysis in [1] where the effect of the round trip propagation delay on performance measures of an Asynchronous Transmission WDMA protocol is examined for infinite population and Poisson arrivals. An other attribute, associated with the WDM networks, that affects their behaviour is the receiver collision phenomenon. Especially this paper examines the influence on throughp...

Trellis-coded modulation (TCM) is a powerand bandwidth efficient digital transmission scheme which offers very low structural delay of the data stream. Classical TCM uses a signal constellation of twice the cardinality compared to an uncoded transmission with one bit of redundancy per PAM symbol, i.e., application of codes with rates n−1 n when 2 denotes the cardinality of the signal constellat...

The delays are the mathematical models of the delay circuits. Delay theory is the mathematical theory that considers the fundamental circuit in digital electronics be the delay circuit and modeling is made by using delays and Boolean functions. The most detailed level of modeling is considered, starting from the delays that occur in gates and wires. Relative inertia is the property of the state...

The action systems formalism has been successfully used as a formal frame work for reasoning about concurrent behaviour Circuits both synchronous and asynchronous exhibit concurrent behaviour In this paper we com bine the design of asynchronous circuits with action systems We show how quasi delay insensitive circuits can be modelled as action systems This is done by de ning classes of action sy...

This paper presents a detailed analysis of the crosstalk-affected delay of coupled interconnects considering process variations. We utilize a distributed RC- model of the interconnections to accurately model process variations. In particular, we perform a detailed investigation of various crosstalk scenarios and study the impact of different parameters on crosstalk delay. While accounting for ...

This paper provides a preliminary investigation into the impact a link with changing propagation delay has on the performance of TCP file transfers. We investigate over a dozen different variable delay patterns, based on spacecraft movement. We highlight the performance impact of such variability, paying close attention to TCP’s retransmission timer, which is based on the observed round-trip ti...

It is well established that increased network transmission speed reduces the e€ectiveness of feedback-based adaptive rate control mechanisms, due to the increased bandwidth propagation delay product. In this environment, di€erences in the propagation delays associated with the controlled sources become larger when measured in slots (transmission time of information unit), potentially inducing s...

In the context of the ‘selfish-mine’ strategy proposed by Eyal and Sirer, we study the effect of propagation delay on the evolution of the Bitcoin blockchain. First, we use a simplified Markov model that tracks the contrasting states of belief about the blockchain of a small pool of miners and the ‘rest of the community’ to establish that the use of block-hiding strategies, such as selfish-mine...