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Optimal power allocation in DS-CDMA with adaptive SIC technique

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Abstract

This paper proposes an optimal power allocation in direct sequence-code division multiple access (DS-CDMA) system. The objective is to minimize total transmit power, while simultaneously meeting the certain sum channel capacity (data transmission rate) and outage probability constraints on Rayleigh fading channel. Then a weighted correlator with an adaptive successive interference cancelation (SIC) scheme is developed using neural network (NN) for an improvement in receiver performance. A closed mathematical form of joint probability of error (JPOE) is derived. This determines the number of active users’ interfering effect that needs to be canceled in order to achieve a desired bit error rate (BER) value. Mathematical analysis shows that better receiver performance can be achieved through large change in weight up-gradation (w) for the strong users with a particular change in learning rate (η). Simulation results in terms of sum capacity as well as weak user’s (users with poor channel gain) capacity, outage probability and BER performance duly support the effectiveness of the proposed scheme over the existing works.

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Acknowledgements

This work is the outcome of the project on “Development of high power and spectral efficiency multiuser system for broadband wireless communication” funded by Ministry of Communication and Information Technology, Govt. of India vide administrative approval no. 13(2)/2008-CC & BT dated 31.03.2008 and the first author acknowledges this financial support.

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  1. Department of Information Technology, Bengal Engineering and Science University, Shibpur, Howrah, 711 103, India

    Santi P. Maity, Sumanta Hati & Chinmay Maji

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  1. Santi P. Maity
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  2. Sumanta Hati
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Correspondence to Santi P. Maity.

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Maity, S.P., Hati, S. & Maji, C. Optimal power allocation in DS-CDMA with adaptive SIC technique. Telecommun Syst 56, 335–346 (2014). https://doi.org/10.1007/s11235-013-9847-2

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