Nature–inspired algorithms are the most powerful algorithms for optimization problems. This paper presents a novel optimization channel allocation algorithm inspired by the flash pattern of fireflies that allows suppression of the four–wave mixing (FWM) crosstalk while maintaining channel bandwidth. It is composed of a fractional bandwidth channel allocation algorithm by using the concept of Op...

In SDMA mobile radio systems where only base stations, but no mobiles are equipped with antenna arrays, co-channel interference on the downlink has to be kept down by beamforming. The performance of the beamformer is determined by the directions of arrival (DOAs) of the users operating in the same frequency/tixne/code slot. Thus the full capacity of an SDMA cell can only be made use of by an ef...

The channel allocation is one of the key problems in the design of the wireless network, as it greatly influences the throughput and performance of the network. Firstly we introduce the channel propagation model, which is able to accurately reflect the signal attenuation, the network interference and other factors in the actual environment. Based on this work, we put forward the channel allocat...

In this paper, a channel estimation algorithm in frequency domain for IFDMA is introduced. Moreover, a post processing algorithm for further improvement of the channel estimation is presented. The performance of IFDMA is analyzed and compared to DFT precoded OFDMA with blockwise subcarrier allocation with and without frequency hopping in terms of overhead that occurs due to pilot assisted chann...

We apply the dynamic bit allocation to the block-based EZW algorithm for robust image compression. To optimize the performance of the bit allocation, the eeect of the channel noise is concerned. The robustness of our method was evaluated.

Broadcasting systems have to deal with channel variability in order to offer the best spectral efficiency to the receivers. However, the transmission parameters that maximise the spectral efficiency generally leads to a large link unavailability. In this paper, we study analytically the tradeoff between spectral efficiency and coverage for various channel resource allocation strategies when bro...

K. Brown S. Singh Department of Computer Science Department of Computer Science University of South Carolina University of South Carolina Columbia, SC 29208 Columbia, SC 29208 Abstract We consider the problem of multicasting optimally to mobile users in a cellular mobile network. In the absence of mobility, a single channel can be used to multicast to all mobile users within a cell. However, mo...

We propose dynamic channel allocation schemes which employ techniques such as channel reservation, service priority and queueing strategies (with or without threshold control) etc. Using these techniques allows system designers to differentiate Quality of Service (QoS) requirements (e.g., new call blocking/handoff forced termination probability and delay) required by different types of service....

More and more modern metaheuristics nature–inspired algorithms are emerging and they become increasingly popular. This paper formulates an algorithm for solving the channel–allocation problem in optical wavelength division multiplexing (WDM) systems to suppress four–wave mixing crosstalk (FWM) based on a novel nature–inspired algorithm, called Cuckoo Search algorithm by using the concept of Opt...

A wireless local loop connects customer premise equipment to the local exchange on the public switched telephone network using radio signals. Compared to wireline local loops, wireless local loops are easier to deploy and less costly to maintain. One of the most important considerations in deploying wireless local loops is to determine the best channel allocation algorithm. This paper provides ...