Title of article :
A bandwidth-power efficient modulation scheme based on quaternary quasi-orthogonal sequences
Author/Authors :
Kim، Youhan نويسنده , , Yang، Kyeongcheol نويسنده , , Cheun، Kyungwhoon نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2003
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 :
Intersubband transitions , mid-infrared , multiple-wavelength emission , quantum cascade laser , Quantum wells , Second-harmonic generation , nonlinear optics
Journal title :
IEEE Communications Letters
Journal title :
IEEE Communications Letters
