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The multiple access technique is suggested for 4G communication system. The various types of multiple access technique are available in the communication system. In this broadsheet compare the enactment of the three most familiar methods constructed on the bit error rate. The three familiar techniques are orthogonal frequency division multiplexing (OFDM), Multi-Carrier Code Division Multiple Access...
Multiband OFDM is the optimum candidate for high rate wireless applications over short distances. The aim of this contribution is to investigate the performance of convolutional code and Reed Solomon code combination for multiband OFDM cognitive radio system. Analysis showed that better performance could be achieved with RS-CC combination than single codes. Furthermore the fast Fourier transform and...
Body Area Networks (BAN) are steadily gaining importance in the area of remote health monitoring. An important concern in this area is the interference from existing wireless networks. The following paper suggests the orthogonal modified hermite pulses for narrowband interference suppression. The performance analysis has been presented in the presence of strong narrowband interference in the 4.8GHz...
We investigate the high peak power resulting from the transmission of orthogonal frequency division multiplexing (OFDM) signals through optical fiber. High peak-to-average power ratio (PAPR) which is a major drawback of OFDM can make worse the nonlinearities experienced in optical fibers. Phase modulation instead of intensity modulation is adopted to keep the amplitude of optical power within the...
This paper presents a basic useful technique for carrier frequency offset (CFO) estimation in orthogonal frequency division multiplexing (OFDM) over frequency selective fading channel. The performance of OFDM system is very sensitive to CFO, which introduces inter-carrier interference (ICI). In cyclic prefix (CP) based estimation, the CFO can be found from the phase angle of the product of CP and...
OrthogonalFrequency Division Multiplexing (OFDM)is becoming the chosen modulation technique for wireless communications. Multicarrier modulation shows a significant sensitivity to the phase noise present in the oscillator used for frequency down-conversion at the portable receiver. For this reason, it is important to evaluate the impact of the phase noise on the system performance. In this paper,...
The field of digital communication is gifted with OFDM, a very powerful technology that opened doors to several applications requiring higher bandwidth and data rates. It survives severe channel conditions like narrow band interference and frequency selective fading. However, the increasing rate of data piracy accentuates the need for a secure wireless transmission. In this paper, we propose a technique...
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