Transmitter apparatus

Details Transmitter apparatus Transmitter apparatus

2006-12-15

2011-10-11

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Transmitters

C375S219000, C375S296000, C375S297000, C375S299000, C375S302000, C455S216000, C455S255000

Reexamination Certificate

active

08036303

ABSTRACT:
A transmitter apparatus capable of reducing the distortions of vector modulated waves. This apparatus includes variable coefficient filters (110,112) in a stage preceding an amplitude signal voltage generating part (104) and also includes variable coefficient filters (111,113) in a stage preceding a phase modulated wave generating part (105). These variable coefficient filters (110-113) are used to perform a pulse shaping, thereby adjusting the delay between an amplitude component modulated signal (r(t)) and a phase component modulated signal (SC(t)) whereby a resolution, which is finer than the sampling period of a signal processing, can be used to adjust the delay time difference between the amplitude component modulated signal (r(t)) and the phase component modulated signal (SC(t)). As a result, the distortions of vector modulated waves (Srf(t)) can be reduced to a sufficiently small level.

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International Search Report dated Mar. 20, 2007.

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