Over two decades, a problem of location dependent has been focused for improving the communication Bandwidth-Power Efficiency of homogeneous networks. The efficiencies of communication links are weakened by the Hidden Terminal Problem.  Thus we propose a Fine – Tune Strategy for analyzing the On-Off communication region. We were observed that the proposed technique had been able to track and mo...

Visible light communication (VLC) has been seeking much attention in recent years due to its high bandwidth, low cost, and ease of implementation. VLC can be used for illumination as well at the same time. Light emitting diode (LED) acts a transmitter data transmission, photo detector is on receiver side. Intensity Modulation (IM) converts an electrical signal into optical signal, where only re...

The impact of carrier pulling on the modulation characteristics of a transistor laser is discussed. The results of a theoretical analysis of modulation bandwidth and damping effect show that the carrier transport effect obtained by using a transistor laser allows for a gain compression factor of about one-tenth that of a conventional laser (0.7×1017 cm3), as well as for a maximum modulation ban...

Differential cross-polarization modulation (DXPoM) wavelength conversion using a semiconductor optical amplifier has been proposed to outperform substantially traditional cross-polarization modulation (XPoM). This work presents analytical small-signal models of XPoM and DXPoM. The transfer function of DXPoM is used to elucidate the significant improvement in bandwidth and the relationships amon...

orthogonal frequency division multiplexing (ofdm) has become a promising method for many wireless communication applications. however, one main drawback of ofdm systems is the high peak-to-average power ratio (papr). selected mapping (slm) is a well-known technique to decrease the problem of high papr in ofdm systems. in this method, transmitter is obliged to send some bits named side informati...

Although spread spectrum systems depend on large bandwidth to achieve performance, they must also operate within bandwidth constraints imposed by frequency allocations. The measures of bandwidth relevant to performance are usually quite different from those defined in frequency allocations. In this paper a number of definitions of bandwidth are discussed, and a number of direct sequence pseudon...