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Four-wave mixing (FWM) effect has become a major problem in wavelength division multiplexing (WDM) systems which is due to the non-linear effects in the fiber. In this paper, Hybrid Modulation techniques are proposed for minimizing the FWM effect. The combination of different modulator is used and the performance is analyzed in a 32-channel wdm system based on Q-factor and Bit Error Rate and FWM product...
Low density parity check codes nowadays use in modern system due to their excellent performance. There are different message passing algorithm for LDPC codes to decode. In this paper, we have mention bit flip algorithm in brief and gave its bit error performance over AWGN channel via simulation result. For this communication, we use BPSK i.e. Binary phase shift keying digital modulation technique...
In the advancement of world there is a need to communicate each other, either in the form of speech, video, audio or data. In the past, message was sent in the form of analog signals, but nowit is handled in the form of digital signals. When the multi carrierwas used instead of single carrier, more multi carrier systems developed such as Orthogonal Frequency Division Multiplexing (OFDM). In this all...
In this correspondence, the bit error rate(BER)performance of interleave division multiple access (IDMA) system using space-time transmit diversity and polarization diversity over correlated frequency-selective channels is evaluated for down-link(DL)communication. Space-time Block code is used Multiple-Input Multiple-Output (MIMO) to achieve spatial diversity. STBC architecture using single dual-polarized...
We consider a cognitive radio network with cooperative spectrum sensing (CSS) and multiple antennas at each secondary user (SU). Each secondary user makes a hard decision and forwards it to the fusion center (FC) over error free channel. In this paper, we derived the expressions for total bit error rate by considering conventional energy detector and improved energy detector. These expressions are...
In Communication Systems, signals are transmitted through channel to the Receiver. Generally Receiver are built in order to recover the original message without any error. With the wired communication, the messages are recovered from the wired channel without any errors by considering only the transmitted message from transmit antenna. But now the trends are moved from the wired to wireless communication...
During the last decade, wireless field has witnessed revolutionary technology developments. The need for high data rates to support various multimedia applications has increased many folds. 3G and 4G technologies like WiMax (Worldwide Interoperability for Microwave Access) and LTE (Long Term Evolution) etc. are providing solution for this requirement of high speed data and high bandwidth. This paper...
The Bit Error Rate(BER) performance of Multi-Branch Multi-Hop (MB-MH) system with Kth best relay choice scheme in AF networks is presented. We excogitated a scheme in cooperative communication networks i.e. a MB-MH system with Kth best relay selection, in order to vanquish the hurdles whenever the best exasperates. Considering all the Rayleigh Fading Channels which are mutually identical and independently...
In today's world of wireless communication MIMO systems have become the most efficient means of transmission of data. However it has certain disadvantages such as inter-channel interference, antenna synchronization and use of more than one RF chain which leads to system complexity and more cost. To overcome these problems, an efficient system is being proposed in this paper by using space shift keying(SSK)...
Wireless communication channel due to multipath propagation phenomenon is prone to various transmission obstacles like noise, interference, fading, and other distortions. These multiple path signals cause variation in signal strength of received signal. Therefore it is important to study the effects of multipath propagation phenomenon in designing the wireless communication systems. Spread spectrum...
A Vertical Cavity Surface Emitting Laser (VCSEL) based low cost multimode fiber optic link is investigated for Gigabit Ethernet applications. The important feature of this work is the inclusion of temperature dependent VCSEL characteristics in the link simulation. The impact of link length and VCSEL temperature on the performance of 1.25 and 2.5 Gb/s data transmission is determined by evaluating the...
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