Title :
A new M-ary/SSMA scheme applicable in LEO satellite communication systems
Author :
Wada, Tadahiro ; Yamazato, Takaya ; Katayama, Masaaki ; Ogawa, Akira
Author_Institution :
Dept. of Inf. Electron., Nagoya Univ., Japan
Abstract :
We discuss non-coherent reception of M-ary spread-spectrum multiple-access (M-ary/SSMA) signals in the presence of large Doppler frequency shift. The Hadamard codes (H-codes) are applied as orthogonal codes. The influence of the Doppler frequency shift has a particular characteristic according to the property of the H-codes. Making use of this property, we first propose an initial carrier frequency acquisition method which can estimate the value of large Doppler frequency shift. We then proposed a M-ary/SSMA scheme that is based on the simultaneous transmission of two distinctive H-codes
Keywords :
Doppler effect; Doppler shift; Hadamard matrices; codes; frequency estimation; multi-access systems; satellite communication; spread spectrum communication; Doppler frequency shift estimation; Hadamard codes; Hadamard matrix; LEO satellite communication systems; M-ary spread spectrum multiple access signals; M-ary/SSMA; initial carrier frequency acquisition method; noncoherent reception; orthogonal codes; Artificial satellites; Bandwidth; Error correction; Error correction codes; Fading; Frequency estimation; Low earth orbit satellites; Modulation coding; Satellite communication; Spread spectrum communication;
Conference_Titel :
Global Telecommunications Conference, 1996. GLOBECOM '96. 'Communications: The Key to Global Prosperity
Conference_Location :
London
Print_ISBN :
0-7803-3336-5
DOI :
10.1109/GLOCOM.1996.594394
