We consider the stationary memoryless channels with input cost. We prove that for transmission rates above the capacity the correct probability of decoding tends to zero exponentially as the block length n of codes tends to infinity. In the case where both of channel input and output sets are finite, we determine the optimal exponent function on the above exponential decay of the correct probab...

Abstract— In this paper, we propose a direct/cooperative amplify-and-forward relay (D/AR) switching using a spectrum division/adaptive subcarrier allocation (SDASA) for increasing the uplink capacity of single carrier-frequency division multiple access (SC-FDMA). In the D/AR switching, switching between direct communication and cooperative AF relay is done so that the channel capacity is maximi...

This paper investigates a number of computational issues related to the use nonlinear static procedures in fragility analysis structures. Such approaches can be used complement dynamic procedures, reducing and modelling effort. Specifically, this study assesses performance Capacity Spectrum Method (CSM) with real (i.e. recorded) ground motions (as opposed code-based conventional spectra) explic...

Based on cognitive self-organizing network transmission delay larger and larger interference to primary user receiver problem, put forward a method of spectrum joint routing selection, this method is effective to consider the transmission delay and the main user interference at the receiving end, mainly from < 1 > bandwidth available probability; < 2 > sent via link the number of bits of varian...

Cognitive radio (CR) has emerged as a promising technology to improve spectrum utilization. Capacity analysis is very useful in investigating the ultimate performance limits for wireless networks. Meanwhile, with increasing potential future applications for the CR systems, it is necessary to explore the limitations on their capacity in a dynamic spectrum access environment. However, due to spec...

Steganography, derived from Greek, literally means “covered writing”. It includes a vast array of secret communications methods that conceal the message’s very existence. These methods include invisible inks, microdots, character arrangement, digital signatures, covert channels, and spread spectrum communications. This paper proposes a new improved version of Least Significant Bit (LSB) method....

Consider a multimedia input traac stream, described by a stationary random process. Our previous study indicates that second-order input statistics, which are described by power spectrum in the frequency domain, play a dominant role in queueing performance as compared with higher-order input statistics. In this paper we show the signiicant eeect of input power spectrum on link capacity allocati...

Since 2000, cognitive radio has slowly been moving from theory into reality. One major driving force for that is tangible commercial applications for cognitive radio, the most major of which is dynamic spectrum access (DSA). A wide variety of DSA techniques have been proposed, in an effort to take advantage of every ounce of unused spectrum. This paper analyzes the three main approaches: freque...

The average channel capacity (in the Shannon sense) per user of a hybrid cellular directsequence/fast frequency hopping code-division multipleaccess (DS/FFH-CDMA) system operating in a Rayleigh fading environment is examined. The analysis covers the downlink of a cellular system assuming a static model of operation and leads to a novel expression for the average channel capacity available to ea...