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.