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The ebook provides papers introduced by means of researchers, business specialists and academicians on the convention on rising developments in Computing and verbal exchange (ETCC 2014). As such, the booklet is a set of modern and cutting edge works within the box community protection and Cryptography, Cloud Computing and large facts Analytics, information Mining and knowledge Warehouse, communique and Nanotechnology and VLSI and photograph Processing.
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Extra resources for Emerging Trends in Computing and Communication: ETCC 2014, March 22-23, 2014
IEEE Pers Commun 5:23–27 2. Balanis CA (1997) Antenna theory analysis and design, 2nd edn. Willey, London 3. Yadav AK, Upmanu V, Yadav SK (2012) Design and analysis of a beam forming network for WLAN application. Int J Sci Res Eng Technol (IJSRET) 1(6):004–009 4. Bhowmik W, Srivastava S (2010) Optimum design of a 4 9 4 planar butler matrix array for WLAN application. J Telecommun 2(1):68–74 5. Pozar DM (2005) Microwave engineering, 3rd edn. Wiley, London Chapter 5 Interference Mitigation in Overlay Cognitive Radio Using Orthogonal Polarization Sandip Karar and Abhirup Das Barman Abstract Interference mitigation is one of the significant challenges in overlay cognitive radio.
1b shows the phase of 90° coupler which has been simulated on IE3D software. 4 GHz frequency. The Fig. 1c shows the coupling and direct coupling in dB. 11 dB) with tolerable errors. 74 dB) (Fig. 1d). 4 Size Reduction of 4 9 4 Butler Matrix 35 Fig. 1a 3 dB branch line coupler Fig. 1b Isolation and return loss Fig. 2 Crossover In the butler matrix array the signal path has to physically crossover while maintaining the high isolation. In this paper the crossover is implemented by cascade of the two 90° hybrids with slight modification on line widths.
Pffiffiffiffiffi pffiffi pffiffi ð5:7Þ yp ¼ ypv À ayph ¼ ð1 À aÞ Pp hpp xp þ npv À a nph Similarly the interfering term at the secondary receiver can be eliminated. pffiffiffiffiffi pffiffi pffiffi ð5:8Þ ys ¼ ysh À aysv ¼ ð1 À aÞ Ps hss xs þ nsh À a nsv The signal-to-noise ratio at the primary receiver and secondary receiver are 2 2 ð1ÀaÞ2 Pp jhpp j Ps jhss j2 respectively given by cp ¼ ð1þaÞr2 and cs ¼ ð1ÀaÞ ð1þaÞr2n . When M-PSK modn ulation is used the symbol error probability (SER) for the primary user is given by: qffiffiffiffiffiffiffiffiffiffi ð5:9Þ bM c p Pse ðprimaryÞ % aM Q À ﬃ where aM ¼ 2 and bM ¼ 2sin2 Mp .