Pulse or digital communications – Receivers – Angle modulation
Patent
1995-04-06
1996-08-27
Chin, Stephen
Pulse or digital communications
Receivers
Angle modulation
375340, H04L 2706
Patent
active
055508677
ABSTRACT:
A complex angle converter includes a comparing device. The comparing device operates to derive first difference data representing a difference between predetermined reference data and data represented by a first baseband signal. The comparing device further operates to derive second difference data representing a difference between the predetermined reference data and data represented by a second baseband signal having a quadrature relation with the first baseband signal. The comparing device further operates for comparing absolute values of the first difference data and the second difference data, and for outputting a signal representative of a result of the comparing. The complex angle converter also includes a device serving to group an inversion of a highest bit of the first baseband signal and second highest and lower bits of the second baseband signal into a first set. An additional device serves to group a highest bit of the second baseband signal and second highest and lower bits of the first baseband signal into a second set. A selector operates to select one of the first set and the second set in response to the output signal of the comparing device. A decoder is included for decoding the highest bit of the first baseband signal, the highest bit of the second baseband signal, and the selected one of the first set and the second set into data representing a complex angle.
REFERENCES:
patent: 4246654 (1981-01-01), Malm
patent: 5005186 (1991-04-01), Aono et al.
patent: 5170415 (1992-12-01), Yoshida et al.
patent: 5239273 (1993-08-01), Hedstrom et al.
Kunieda Yoshinori
Matsubara Naoki
Ohnishi Hiroshi
Takahashi Ken'ichi
Yamamoto Yuuri
Chin Stephen
Matsushita Electric - Industrial Co., Ltd.
Phan Hai H.
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