Title :
High capacity to differentially detected π/4 shifted DQPSK with narrowing occupied bandwidth based on short time DFT
Author :
Kishi, Masahichi
Author_Institution :
Inf. Network Eng., Aichi Inst. of Technol., Japan
Abstract :
The author gives an overview of the narrowing bandwidth of π/4 shifted differential quadrature phase shift keying (DQPSK), which was previously achieved using a raised cosine filter, at 1.62-b/Hz efficiency, based on the Nyquist-Kaiser filter and generalized short time discrete Fourier transform (DFT) (ST gDFT) demodulator. He gives a technique in which such degradations as those caused from Gaussian thermal and fading click noise are desmeared through ST gDFT to improve efficiency to more than 1.80 b/Hz
Keywords :
Gaussian noise; bandwidth compression; differential phase shift keying; discrete Fourier transforms; fading; intersymbol interference; quadrature phase shift keying; thermal noise; π/4 DQPSK; Gaussian thermal noise; Nyquist-Kaiser filter; bandwidth; differential quadrature phase shift keying; efficiency; fading click noise; generalized short time discrete Fourier transform; Bandwidth; Equations; Fading; Filters; Frequency; Gaussian noise; Interference; Read only memory; Signal to noise ratio; Solids;
Conference_Titel :
Vehicular Technology Conference, 1993., 43rd IEEE
Conference_Location :
Secaucus, NJ
Print_ISBN :
0-7803-1267-8
DOI :
10.1109/VETEC.1993.507492
