Advanced Digital Communications: Systems and Signal Processing Techniques
Advanced Digital Communications: Systems and Signal Processing Techniques
Wireless Communications & Mobile Computing - Cognitive Radio and Advanced Spectrum Management
Z-complementary sets based on sequences with periodic and aperiodic zero correlation zone
EURASIP Journal on Wireless Communications and Networking
Walsh-Like Nonlinear Phase Orthogonal Codes for Direct Sequence CDMA Communications
IEEE Transactions on Signal Processing - Part II
Inter-Group Complementary Codes for Interference-Resistant CDMA Wireless Communications
IEEE Transactions on Wireless Communications
Multiphase Complementary Codes
IEEE Transactions on Information Theory
IEEE Communications Magazine
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In this paper, a method of constructing a sequence set similar to Walsh Hadamard (WH) codes is described. In general, two complementary sequence set of length 2 is used as a basic kernel to construct WH codes. In this work, four complementary sequence set of length 3 is used as a basic kernel. The proposed code set have a nearly non linear phase sequences with a more evenly spread frequency spectrum when compared with WH codes. It is shown that the proposed spreading codes perform comparable to WH in a Direct Sequence code division multiple access (DS-CDMA) system in an Additive White Gaussian Noise and Rayleigh channel at a reduced code length. In this work, bit error rate performance of the Underlay Cognitive Radio system implemented using DS-CDMA system is simulated. Primary and Secondary Users are distinguished by assigning spreading codes from different families and it is assumed that the channel information is known by both the Primary and Secondary User receivers. This new code set offers good performance in a Cognitive Radio Underlay system.