Download now Free registration required
Direct Sequence-Code Division Multiple Access (DS-CDMA) technique is used in cellular systems where users in the cell are separated from each other with their unique spreading codes. In recent times DSCDMA has been used extensively. These systems suffers from Multiple Access Interference (MAI) due to other users transmitting in the cell, channel Inter Symbol Interference (ISI) due to multipath nature of channels in presence of Additive White Gaussian Noise (AWGN). Spreading codes play an important role in multiple access capacity of DS-CDMA system. M-sequences, gold sequences etc., has been traditionally used as spreading codes in DS-CDMA. These sequences are generated by shift registers and periodic in nature.
- Format: PDF
- Size: 250.9 KB