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Performance enhancement of MC-CDMA system through novel sensitive bit algorithm aided turbo multi user detection.

Kumaravel R, Narayanaswamy K - PLoS ONE (2015)

Bottom Line: The OFDM parts reduce multipath fading and inter symbol interference (ISI) and the CDMA part increases spectrum utilization.The multiuser detection (MUD) and turbo coding are the two dominant techniques for enhancing the performance of the MC-CDMA systems in terms of BER as a solution of overcome to MAI effects.Simulation results show that the proposed method provides better BER performance with low complexity decoding, by mitigating the detrimental effects of MAI.

View Article: PubMed Central - PubMed

Affiliation: Department of Information Technology, Sri Venkateswara College of Engineering, Pennalur-602117, Sriperumbudur, India.

ABSTRACT
Multi carrier code division multiple access (MC-CDMA) system is a promising multi carrier modulation (MCM) technique for high data rate wireless communication over frequency selective fading channels. MC-CDMA system is a combination of code division multiple access (CDMA) and orthogonal frequency division multiplexing (OFDM). The OFDM parts reduce multipath fading and inter symbol interference (ISI) and the CDMA part increases spectrum utilization. Advantages of this technique are its robustness in case of multipath propagation and improve security with the minimize ISI. Nevertheless, due to the loss of orthogonality at the receiver in a mobile environment, the multiple access interference (MAI) appears. The MAI is one of the factors that degrade the bit error rate (BER) performance of MC-CDMA system. The multiuser detection (MUD) and turbo coding are the two dominant techniques for enhancing the performance of the MC-CDMA systems in terms of BER as a solution of overcome to MAI effects. In this paper a low complexity iterative soft sensitive bits algorithm (SBA) aided logarithmic-Maximum a-Posteriori algorithm (Log MAP) based turbo MUD is proposed. Simulation results show that the proposed method provides better BER performance with low complexity decoding, by mitigating the detrimental effects of MAI.

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Performance of the MC-CDMA system using Log MAP over AWGN Channel.
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pone.0115710.g005: Performance of the MC-CDMA system using Log MAP over AWGN Channel.

Mentions: Fig. 5 illustrates the BER performance of the MC-CDMA system using Log MAP algorithm based turbo MUD for various iterations over AWGN channel. It is observed from the plots that the number of iterations increases with 2,4,6,8 and 10 iteration the BER performance of the system improved progressively. It is clearly indicates that the Log MAP based turbo MUD outperform over SOVA based turbo MUD. Further it is revealed that the Log MAP based turbo MUD scheme yield a maximum BER of 3.21E-08 at iteration 10 for SNR 6 dB.


Performance enhancement of MC-CDMA system through novel sensitive bit algorithm aided turbo multi user detection.

Kumaravel R, Narayanaswamy K - PLoS ONE (2015)

Performance of the MC-CDMA system using Log MAP over AWGN Channel.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4340792&req=5

pone.0115710.g005: Performance of the MC-CDMA system using Log MAP over AWGN Channel.
Mentions: Fig. 5 illustrates the BER performance of the MC-CDMA system using Log MAP algorithm based turbo MUD for various iterations over AWGN channel. It is observed from the plots that the number of iterations increases with 2,4,6,8 and 10 iteration the BER performance of the system improved progressively. It is clearly indicates that the Log MAP based turbo MUD outperform over SOVA based turbo MUD. Further it is revealed that the Log MAP based turbo MUD scheme yield a maximum BER of 3.21E-08 at iteration 10 for SNR 6 dB.

Bottom Line: The OFDM parts reduce multipath fading and inter symbol interference (ISI) and the CDMA part increases spectrum utilization.The multiuser detection (MUD) and turbo coding are the two dominant techniques for enhancing the performance of the MC-CDMA systems in terms of BER as a solution of overcome to MAI effects.Simulation results show that the proposed method provides better BER performance with low complexity decoding, by mitigating the detrimental effects of MAI.

View Article: PubMed Central - PubMed

Affiliation: Department of Information Technology, Sri Venkateswara College of Engineering, Pennalur-602117, Sriperumbudur, India.

ABSTRACT
Multi carrier code division multiple access (MC-CDMA) system is a promising multi carrier modulation (MCM) technique for high data rate wireless communication over frequency selective fading channels. MC-CDMA system is a combination of code division multiple access (CDMA) and orthogonal frequency division multiplexing (OFDM). The OFDM parts reduce multipath fading and inter symbol interference (ISI) and the CDMA part increases spectrum utilization. Advantages of this technique are its robustness in case of multipath propagation and improve security with the minimize ISI. Nevertheless, due to the loss of orthogonality at the receiver in a mobile environment, the multiple access interference (MAI) appears. The MAI is one of the factors that degrade the bit error rate (BER) performance of MC-CDMA system. The multiuser detection (MUD) and turbo coding are the two dominant techniques for enhancing the performance of the MC-CDMA systems in terms of BER as a solution of overcome to MAI effects. In this paper a low complexity iterative soft sensitive bits algorithm (SBA) aided logarithmic-Maximum a-Posteriori algorithm (Log MAP) based turbo MUD is proposed. Simulation results show that the proposed method provides better BER performance with low complexity decoding, by mitigating the detrimental effects of MAI.

Show MeSH