Cdma Vs Gsm1

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Mayank Vora

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– There are others : IS95 HDR, EDGE, etc. » Direct Spread CDMA TDD » Direct Spread CDMA FDD » Multi-carrier CDMA FDD Global 3G comprises of 3 modes : – Marketed as Global 3G CDMA implying a single unified standard. In reality, – Mostly dominated by Direct Sequence CDMA. – Market is expected to be fragmented amongst several competing IMT2000 guidelines defined by the ITU. – Analog was 1G. GSM/IS95 were 2G. Next is 3G. What is 3G ? standards. across the world. Envisioned as a single Global standard allowing seamless roaming Used interchangeably with IMT2000 although there are some specific A loosely defined term referring to next generation wireless systems.

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although OFDM seems to be a solution to keep up with the demand of increasing data rates, it has some drawbacks. Sensitivity to high PAPR is the most significant of these drawbacks. The main objective of this paper was to investigate and document the effects of PAPR on the performance of OFDM based digital communications under different channel conditions. A step-by-step approach was adopted in order to achieve the objective of this paper. The first step is to provide a basic background on the principles of OFDM. The reasons for the PAPR and a theoretical analysis of these effects on OFDM systems are documented. The OFDM system has a high peak-toaverage power ratio (PAPR) that can cause unwanted saturation in the power amplifiers, leading to in-band distortion and out-ofband radiation. To be able to observe the system behavior, the simulation results for different channel models are presented in graphical form. Next, the simulation results obtained in this work are compared to the simulation results reported in related studies

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Cdma Vs Gsm1

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Cdma Vs Gsm1

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