# BER Analysis for MC-CDMA

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4 10 0 BER vs Nu 30 Nc vs Nu BER Number of users (Nu) Number of user (Nu) Figure 9: BER vs. Nu Numberof Subcarrier(Nc) Figure 11: Nu vs. Nc Here, we can see the plot between the numbers of user (Nu) with unconditional Bit error rate (BER). If we increase the number of user (Nu) the bit error rate (BER) will be increase. After reach in nee point the bit error rate is getting fixed. We have used the formula of unconditional bit error rate. Here the number of user (Nu) is 128 and each user divided into (iv) The Number of user (Nu) with unconditional Bit error rate (BER) with Nc= 32, 64, 128, 200 BER BER vs Nu data1 data2 data3 data Number of user (Nu) Figure 10: BER vs. Nu (with value of Nc) Here we can also see that the plot between the Number of user (Nu) vs. unconditional Bit error rate (BER). In this plot, we consider the number of sub-carrier (Nc) and vary this into different values such as Nc= 32, 64, 128, 200. (v) The number of sub-carrier (Nc) with the number of users (Nu) This plot is from the previous graph. For different values of Nu we got different values of Nc. Here the conditional bit error rate is 10^-15. If we increase the number of sub-carrier (Nc) then the number of users (Nu) will be also be increase. 6. Conclusion This paper reviews Multicarrier based CDMA schemes such as MC CDMA, DS CDMA and MC DS CDMA with the effect of fading and discuss about their some features. This paper is basically focused on the MC DS CDMA system and its analysis with fading. In this paper I use MATLAB to find some plots to verify the concept of multicarrier CDMA and finally I concluded the following facts that On comparing the numbers of user (j) with inter-carrier interference (ICI) as we increase the number of user (j) then the inter carrier interference (ICI) will be increase. And on comparing BER db with signal power (Ps) as if we increase the signal power (Ps) then bit error rate will be decreasing. Also on comparing the Number of user (Nu) with unconditional Bit error rate (BER) as we increase the number of user (Nu) the bit error rate (BER) will be increase. On comparing the Number of user (Nu) with unconditional Bit error rate (BER) we conclude that with the increase the number of user (Nu) the bit error rate (BER) will be increaseand finally on comparing the number of sub-carrier (Nc) with the number of users (Nu) as we increase the number of sub-carrier (Nc) then the number of users (Nu) will be also be increase. References [1] V.Nagarajan and P. Dananjayan, Performance Analysis of MIMO MC-DS/CDMA System Using Chaotic Spreading Sequence, International Journal of Computer and Electrical Engineering, Vol. 2, No. 2, April, 2010 [2] Tao LUO, Gang WU, and Shaoqian LI, Yong Liang GUAN, Choi Look LAW, DS-CDMA and MC-CDMA with Per-User MMSE Frequency Domain Equalization, International journal of hybrid information technology, vol 1.1,No. 3, july2008 [3] V.Nagarajan and P.Dananjayan, Performance Enhancement Of Mc-Ds/Cdma System Using Chaotic Spreading Sequence, Journal of Theoretical and Applied Information Technology, JATIT. Paper ID:

5 [4] Salih M. Salih, N. Uzunoglu, A. A. Ali and Waleed A. Mahmud A Proposed Improvement Model of MC- CDMA Based FFT in AWGN Channel Pg , IEEE [5] Shinsuke Hara and Ramjee Prasad, Overview of Multicarrier CDMA, Pg , IEEE Dec [6] John G. Proakis, Digital Communications. Mc. Graw Hill International, Fourth edition. [7] S. Salivahanan, A. Vallavraj and C. Gnanapriya, Digital Signal Processing, Tata Mc. Graw Hill Publishing Company Limited. Paper ID:

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