To properly evaluate the usage of SIC, a joint design of power and rate adaptation algorithm with scheduling in wireless networks is to be analyzed.SIC (Successive Interference Cancellation) is an effective way of multiple packet reception (MPR) to fight with interference in wireless networks. Power management and high data rate is an important problem in wireless networks. With the help of SIC...

Voice traffic by nature is high in data volume and sensitive to network impairments. Bandwidth requirement for voice calls is, therefore, higher. An increasingly serious dilemma, as the amount of VoIP traffic increases, is that it will not be fair to give priority to the multimedia traffic and starve its best-effort counter part; yet the voice data delivered might not be perceptible if each voi...

We investigate the eeect of fading correlation and branch gain imbalance on the Shannon capacity of diversity systems in conjunction with adaptive transmission techniques. This capacity provides the theoretical upper bound for the spectral eeciency of adaptive transmission schemes. We obtain closed-form expressions for this capacity for Rayleigh fading channels under four adaptation policies: o...

pythium irregulare oomycetes adapts with environmental changes including crude oil concentration by changing the composition of lipids in the cytoplasmic membrane and providing the required characteristics for adaptation in improper and stressful environmental situations. it was found that cultivation of pythium irregulare lx oomycetes in the nutrient media with different concentrations of crud...

Genetically correlated traits do not evolve independently, and the covariances between traits affect the rate at which a population adapts to a specified selection regime. To measure the impact of genetic covariances on the rate of adaptation, we compare the rate fitness increases given the observed G matrix to the expected rate if all the covariances in the G matrix are set to zero. Using data...

Introduction: the experts of radiology play a crucial role in the treatment programs of the patients in hospitals. Therefore, in order to recognize the needs, the experts’ opinion should be obtained about whether the educational program meets the job requirements or not. The purpose of the present study is to investigate the rate of adaptation between the courses of radiation technology and job...

An overview of MPEG-21 standard together with the application of the rate distortion theory in modeling for network adaptation is provided. The first section introduces parts of this standard as well as motivation and objective for all of them. Next section deals with Digital Item Adaptation (DIA) as a part of the MPEG-21 Multimedia Framework. DIA specifies metadata for assisting the adaptation...

We consider the design of optimal strategies for joint power adaptation, rate adaptation and scheduling in a multi-hop wireless network. Most existing strategies for ad-hoc networks control either power and scheduling, or rates and scheduling, but not the three together as we do. We assume the underlying physical layer allows finegrained rate adaptation (like in 802.11a/g, HDR/CDMA, UWB). Our g...

In this paper, we develop a transmit power adaptation method that maximizes the total data rate of multiuser orthogonal frequency division multiplexing (OFDM) systems in a downlink transmission. We generally formulate the data rate maximization problem by allowing that a subcarrier could be shared by multiple users. The transmit power adaptation scheme is derived by solving the maximization pro...