Pulse or digital communications – Receivers – Angle modulation
Patent
1997-03-13
1999-12-07
Le, Amanda T.
Pulse or digital communications
Receivers
Angle modulation
375349, 375350, 455303, 455307, 455311, H04L 2714
Patent
active
059995742
ABSTRACT:
An input analog signal is sampled at a sampling frequency f.sub.s, which is four times a carrier frequency f.sub.c. A demultiplexer 11 outputs supplied data to four systems sequentially, and generates four zero carriers whose frequencies and amplitudes are equal to each other, with only the phases being different. The delay circuits 12 to 15 delay each one of the zero carriers, and supply delayed signals to adaptive filters 16 to 19. Data output from the four adaptive filters 16 to 19 are selected by a multiplexer 22, and the multiplexer 22 outputs the selected signals as a single signal. The difference between a first zero carrier and an output signals of the first adaptive filter 16 is obtained, and tap coefficients of the adaptive filters 16 to 19 are controlled in accordance with an LMS algorithm based on the difference. A signal output by the multiplexer 22 is output as a reproduced carrier.
REFERENCES:
patent: 5226057 (1993-07-01), Boren
patent: 5502747 (1996-03-01), McGrath
patent: 5521946 (1996-05-01), Main
patent: 5548243 (1996-08-01), Sun et al.
Nakajima Michio
Sun Weimin
Yamauchi Hirofumi
Icom Incorporated
Le Amanda T.
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