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MULTIUSER ON DS-CDMA IN PRESENCE OF THREE-PATH FADING CHANNEL | ||
| AL-TAQANI | ||
| Article 1, Volume 24, Issue 2, 2011, Pages 189-201 | ||
| Author | ||
| Sadiq Kamel Gharkan | ||
| Abstract | ||
| Direct Sequence Code Division Multiple Access (DS-CDMA) communication system have attracted considerable attention for third-generation (3G) mobile system .They have the ability to suppress a wide variety of interfering signals including Narrow-Band (NB) ,Multiple Access interference (MAI) and Multipath Interference (MPI). Multipath effects are one of the major factors that limit system performance depending on the channel characteristics, in this paper the three paths effect was taken on DS-CDMA for ten users transmitted as baseband binary phase shift keying(BPSK) and the system assume synchronized. Five users have maximal-linear code (127bits) and five users have gold code (127bits) in order to measure the difference between them, the code rate 8.125 MHz for each user with data rate 64Kb/s and the system was designed and simulated by using MATLAB-simulink version (6.5). The probability of error (BER) was calculated for different cases of signal to noise ratio (Eb/No),the BER for maximal-linear code was 7.18x10-3for where as for gold code was 4.375x10-4 at Eb/No equal -2dB under three paths effect . | ||
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