Superimposed effects of signature sequences and LDPC technique in faded CDMA multiuser systems

Multiuser detection systems face multiple challenges during communication error correction process when the communication environment is dramatically affected by fading. Depending on the type of channel model that occurs during a communication the bit error rate (BER) can be more or less decreased using appropriate coding/decoding technique. This paper illustrates error correction in (Low-Density Parity Check Code Division Multiple Access) LDPC-CDMA systems when Gaussian mixture noise and Nakagami-m fading affect the multiuser communication. The proposed DS-CDMA multiuser system in combination with LDPC technique together with a careful choice of signature sequences will significantly improve the performance of the multiuser system and will minimize the effect of Gaussian mixture noise and Nakagami fading on the communication channel.

[1]  E. V. Krishna Rao,et al.  Interference and Complexity Reduction in Multi-stage Multi-user Detection in DS-CDMA , 2014, Wirel. Pers. Commun..

[2]  R. Jabr,et al.  Statistical Representation of Distribution System Loads Using Gaussian Mixture Model , 2010 .

[3]  Elena Simona Lohan,et al.  An improved simulation model for Nakagami-m fading channels for satellite positioning applications , 2006 .

[4]  Monika Agrawal,et al.  On the performance of underwater communication system in noise with Gaussian Mixture statistics , 2014, 2014 Twentieth National Conference on Communications (NCC).

[5]  Nicola Marchetti,et al.  Massive MIMO and waveform design for 5th generation wireless communication systems , 2014, 1st International Conference on 5G for Ubiquitous Connectivity.

[6]  Simona Halunga,et al.  Implication of LDPC Technique in Non-ideal Multiuser Communication System , 2016, Wirel. Pers. Commun..

[7]  Alan W. C. Tan,et al.  Performance comparison of SNR estimators in Gaussian mixture noise , 2011, 2011 IEEE International Conference on Signal and Image Processing Applications (ICSIPA).

[8]  Rick S. Blum,et al.  On the Approximation of Correlated Non-Gaussian Noise Pdfs using Gaussian Mixture Models , 1999 .

[9]  Octavian Fratu,et al.  Performance evaluation of conventional and MMSE multiuser detection algorithms with different spreading signature codes , 2011, 2011 IEEE EUROCON - International Conference on Computer as a Tool.

[10]  Valentine A. Aalo,et al.  On the MGF and BER of Linear Diversity Schemes in Nakagami Fading Channels with Arbitrary Parameters , 2009, VTC Spring 2009 - IEEE 69th Vehicular Technology Conference.

[11]  Simona V. Halunga,et al.  LDPC vs turbocodes behavioral analysis in multiuser DS-CDMA systems , 2014, 2014 11th International Symposium on Electronics and Telecommunications (ISETC).