In this high-speed wireless communications era, the concept of multi carrier transmission provides high data rates in communication channel. The OFDM is a special kind of multi carrier transmission technique that divides the communication channel into several equally spaced frequency bands. Here the bit streams are divided into many sub streams and send the information over different sub channe...

The new generation of LED-based illuminating infrastructures has enabled a “dual-paradigm" where LEDs are used for both illumination and communication purposes. The ubiquity of lighting makes visible light communication (VLC) well suited for communication with mobile devices and sensor nodes in indoor environment. Existing research on VLC has primarily been focused on advancing the performance ...

In this paper a technique is offered for improving the efficiency of communication. The prime objective of any Communication Technique is not only to make the communication clear, efficient and noise free but also to make the communication well secured from its interception from unauthorized users in both commercial as well as in defense communication. For this purpose nowadays the most commonl...

Carrier frequency offset (CFO) in OFDM systems results in loss of channel orthogonality and hence degrades the system’s performance. In this paper, we propose a new method for joint CFO/channel estimation for OFDM systems with two receive antennas. Our method avoids the complexity of full search methods in one or two dimensions. Using one training OFDM symbol and utilizing the knowledge of the ...

This paper describes research challenges in Molecular Communication, a new communication paradigm inspired by biological systems. Molecular communication allows biological and artificially-created nanomachines to communicate over a short distance using molecules. In molecular communication, a sender nanomachine encodes information onto molecules (information molecules). Information molecules th...

The new generation of LED-based illuminating infrastructures has enabled a “dual-paradigm" where LEDs are used for both illumination and communication purposes. The ubiquity of lighting makes visible light communication (VLC) well suited for communication with mobile devices and sensor nodes in indoor environment. Existing research on VLC has primarily been focused on advancing the performance ...

Mobile underwater acoustic communication technology has been widely employed in marine measurement and offshore engineering. The irregular relative motion between the transmitter receiver causes time-varying Doppler shifts, which can cause severe inter-carrier interference (ICI) thus affect performance of orthogonal chirp division multiplexing (OCDM) communication. Conventional techniques such ...

The performance of long-haul high speed coherent optical fiber communication systems is significantly degraded by the laser phase noise and the equalization enhanced phase noise (EEPN). In this paper, the analysis of the one-tap normalized least-mean-square (LMS) carrier phase recovery (CPR) is carried out and the close-form expression is investigated for quadrature phase shift keying (QPSK) co...

WiMAX is at the peak of communication technology as it is gaining a great position in the next generation of wireless networks. With the development of various wireless networks rapidly, they have turn into necessary infrastructure in our networking atmosphere. The main challenge for WiMAX is the problems associated with various jamming attacks that make them unavailable. Jamming attack is easy...

The wireless system for communication uses the orthogonal frequency division multiplexing in these days. The rapid growth of high data rate transmission makes a need to improve the performance of a network. This can be made easy by using Orthogonal Frequency Division Multiplexing. OFDM is an approach in which the multicarrier transmission technique has been used for wireless communication. Here...