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A High Efficiency Spread Spectrum Scheme Using Approximate Orthogonal Complex Sequences
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International Journal of Communications, Network and System Sciences·Volume 03 (2010)·Pages 79–82·Published 20 January 2010·DOI10.4236/ijcns.2010.31011
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Abstract
This paper presents a high efficiency spread spectrum scheme using approximate orthogonal complex (AOC) sequences. In this scheme, the 64 AOC sequences picked up from 84 complex sequences space are employed for spreading spectrum. In modulation, 6 input bits is used to select one AOC sequence, and the selected sequence is then phase-rotated by another 2 input bits. In demodulator, a complex correlator detects the transmitted AOC sequence. Simulation results show that the proposed scheme has better BER performance than the existing complementary code keying (CCK) modulation scheme. For AOC, additional processing gain of 1.79dB can be obtained when the sequence length is 8.
KeywordsSpread Spectrum CommunicationsApproximate Orthogonal Complex (AOC) SequencesModulation and Demodulation
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