Title :
A bandwidth-power efficient modulation scheme based on quaternary quasi-orthogonal sequences
Author :
Kim, Youhan ; Cheun, Kyungwhoon ; Yang, Kyeongcheol
Author_Institution :
Div. of Electr. & Comput. Eng., Pohang Univ. of Sci. & Technol., South Korea
fDate :
7/1/2003 12:00:00 AM
Abstract :
A novel modulation scheme suitable for noncoherent demodulation based on quaternary quasi-orthogonal sequences is proposed. Compared to orthogonal modulation, the controlled quasi-orthogonality between the sequences allows significantly increased bandwidth efficiency with little or no degradation in power efficiency. A hardware efficient demodulator structure using fast Walsh transforms is also presented.
Keywords :
Walsh functions; demodulation; modulation; transforms; bandwidth-power efficient modulation; fast Walsh transforms; hardware efficient demodulator structure; noncoherent demodulation; quaternary quasi-orthogonal sequences; AWGN channels; Bandwidth; Channel capacity; Costs; Degradation; Demodulation; Frequency shift keying; Hardware; Microwave integrated circuits; Phase modulation;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2003.813821
