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The DS-CDMA system has a serious problem that is the multiple-access interference (MAI). Usually, people use the Multi-User detection (MUD) to cancel the MAI. The Multi-User detection makes the best use of the information of other users to cancel the MAI. Indeedly, MUD can cancel the MAI completely, but it has very large computational burden and it increase the noise of the system, besides, it needs...
Direct sequence code division multiple access (DSCDMA) is mainly an interference limited channel. When several users are accessed in a common channel and since signature sequences assigned to users are not perfectly orthogonal, so interference is introduced in each user's desired signal. Several interference cancellation methods were proposed to reduce multi-access interference. In this paper, we...
Spread spectrum signals are now widely used for secure communications, as well as for multiple access interference (MAI). They have many interesting properties, including low probability of interception. Indeed, DS/SS transmitters use a periodical pseudo-random sequence to modulate the baseband signal before transmission. A receiver which does not know the sequence can not demodulate the signal. Blind...
The imperfect statistic and spectrum characteristics of direct spread spectrum signals will effect on the performance of narrow-band interference (NBI) suppression in DS/CDMA. To resolve this problem, an improved QR-decomposition-based least squares lattice (QRD-LSL) interpolator based on cycle-counteract (CYC) nonlinear processing is proposed. Applying the discrepancy of cycle correlation characteristics...
In this paper we use the same analytical method to study a generic STBC-CDMA system. A comprehensive analysis has been carried out to derive the bit error rate performance expression of such a system under MAI and flat fading considering maximal ratio combining scheme at the receiving side and examined the performance of the system with the correlation values for different code (OC code, m-sequence,...
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