Performance of Punctured Convolutional Codes in A-CDMA Systems with Accurately Modelled Multiple Access Interference Under Perfect Phase Tracking Conditions
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In this paper, a simplified expression for Improved Gaussian Approximation is considered to model multiple access interference in an A-CDMA system. Punctured convolutional codes, which are one of the subclasses of convolutional codes, are employed to provide error protection to the information transmitted over the wireless channel. A detailed theoretical analysis is made initially and then compared with the simulated results for various code rates. The simulated performance of the codes is then compared for different power levels and different number of interferers of the desired user. A perfect phase reference is assumed to be available for the information signal of the desired user throughout this paper.
KeywordsPunctured convolutional codes Maximum likelihood decoding Asynchronous Code Division Multiple Access system Multi User Interference Perfect phase tracking Improved Gaussian Approximation
- 3.T. S. Rappaport, Wireless Communications: Principles and Practice, 2nd ed. Prentice Hall Inc., Upper Saddle, 2002.Google Scholar
- 6.F. Cheng and J. M. Holtzman, Effect of tracking error on DS-CDMA successive interference cancellation, IEEE Global Communications Conference, San Francisco, pp. 166–170, December 1994.Google Scholar
- 10.J. G. Proakis, Digital Communications, 4th ed. McGraw Hill, New York, 2001.Google Scholar
- 12.S. B. Wicker, Error control systems for Digital Communications and Storage, Prentice Hall Inc., Upper Saddle, 1995.Google Scholar