We propose optical path routing and frequency slot assignment algorithms that can make the best use of elastic optical paths and the capabilities of distance adaptive modulation. Due to the computational difficulty of the assignment problem, we develop algorithms for 1+1 dedicated/1:1 shared protected ring networks and unprotected mesh networks to that fully utilize the characteristics of the t...

Development of novel signal processing and communication techniques for 3G wireless systems is motivated by high data rate service requirements. These techniques include adaptive modulation and transmitter antenna diversity. In rapidly time variant channels, these methods need the knowledge of future fading conditions. Thus, they require accurate long range fading prediction. We investigate thr...

RF power output has been a major planning aspect for engineers since the start of radio transmission. Undoubtedly important, RF Power level is only one of many factors that determine a successful wireless network. To effectively evaluate and differentiate between various microwave systems and link performance, operators should be able to examine several key aspects of RF power output. Propagati...

A classical strategy for optimizing digital communication systems is the minimization of the error rate. In this paper we propose a new paradigm: Our main goal is the estimation of the error rate. This alternative strategy offers us (i) to use iterative demodulation and decoding techniques (e.g. turbo codes), (ii) to optimize adaptive modulation and adaptive source and channel coding techniques...

In this paper, we analyze the temporal modulation characteristics of speech and noise from a speech/non-speech discrimination point of view. Although previous psychoacoustic studies [3][10] have shown that low temporal modulation components are important for speech intelligibility, there is no reported analysis on modulation components from the point of view of speech/noise discrimination. Our ...

This paper examines the benefits of using adaptive modulation in terms of spectral efficiency and probability of bit error in single carrier baseband systems. Specifically, the performance enhancement has been examined using channel quality indicator in conjunction with adaptive modulation. The paper investigates the output (best modulation scheme) on basis of channel quality indicators (SNR, D...

– Adaptive transmission techniques such as adaptive modulation and transmitter antenna diversity have been proposed for mobile wireless systems to satisfy high data-rate service requirements. In rapidly time variant channels, these methods need the knowledge of future fading conditions and therefore require accurate long range fading prediction. We investigate three combined adaptive modulation...

Abstract—Previous studies on analog network-coded two-way relay (ANC-TWR) assumed the same modulation and coding both for the mobile terminal (MT)-relay station (RS) link and the base station (BS)-RS link. In this paper, we propose an adaptive ANC-TWR, where adaptive modulation and coding (AMC) is employed in order to maximize the uplink (MT-RS-BS) and downlink (BS-RS-MT) throughputs. The singl...