Performance Analysis of Code Division Multiple Access for Wireless Applications

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Jayati Paliya


The so called 3rd Generation wireless communication systems i.e. UMTS or IMT-2000 are expected to dominate the market of cellular communication within the next few years. To distinguish different users these systems do not assign a particular time slot or a particular carrier frequency as it was done in the current systems like GSM. The 3G systems are defined using code division multiple access schemes (CDMA) in order to improve system characteristics. This paper presents the performance evaluation of a multi-user CDMA system in terms of Probability of error (Pe) v/s SNR for wide variety of vital system parameters & components. The study has been motivated by the fact that CDMA greatly simplifies the complexity of a system & enables efficient and reliable multiple access. It also contravenes the need of elaborate network synchronization in traditional approaches like TDM, FDM. The system has been tested for an optimal combination of various parameters like error detecting and correcting codes, spreading codes, QPSK modulation and various graphs have been plotted between Pe & SNR as a measure of performance appraisal. Exhaustive discussion of Spread Spectrum technology has been done along with analysis of the future scope of CDMA technology.


Keywords: GSM, 3G technology, probability of error (Pe), Signal to noise ratio (SNR).


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