Telecommunications – Receiver or analog modulated signal frequency converter – Plural receivers
Patent
1987-12-14
1989-09-19
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Plural receivers
455137, 455277, 455273, H04B 106, H04B 708
Patent
active
048688908
ABSTRACT:
A diversity combiner is provided for combining two received radio signals having the same frequency and modulation. For each of the radio signals (s, s') there is included a mixer (1, 1') with an associated voltage controlled local oscillator (2, 2') and a following intermediate frequency filter (3, 3') for generating an intermediate frequency signal (m,m') and a phase comparator (5, 5') for comparing the intermediate frequency signal with a reference signal (a) originating from a weighted aggregate (e) of the intermediate frequency signals (m, m). Each phase comparator (5, 5') sends a signal responsive to the phase difference and which controls the frequency of the local oscillator (2, 2'). The weights of the sub signals can be varied such that the quotient of the contribution of the sub-signals to the aggregate can be caused to correspond to an arbitrary power, which is greater than or equal to one, of a corresponding quotient before the addition. This is achieved by the aggregate being formed by a signal weighting and adding circuit (8), which includes four bipolar transistors, and which is controlled by two voltages (N, N') which are responsive to the logarithm of the amplitude of the intermediate frequency signals (m, m').
REFERENCES:
patent: 3631344 (1971-12-01), Greenwald
patent: 4210871 (1980-07-01), Hill et al.
patent: 4633519 (1986-12-01), Gotoh et al.
patent: 4696058 (1987-09-01), Tachita et al.
Griffin Robert L.
Smith Ralph E.
Telefonaktiebolaget L M Ericsson
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