Combiner circuit in space-diversity reception

Details Combiner circuit in space-diversity reception Combiner circuit in space-diversity reception

1991-05-23

1993-04-13

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Plural receivers

455139, 455273, 4552761, H04B 1702

Patent

active

052030296

ABSTRACT:
A combiner circuit employs the maximum power method, in which the phase of one of the signals is varied such that the power of the aggregate signal (main and diversity) is varied such that the power of the aggregate subsequently formed is optimally high. In order to improve this combining method that becomes less and less efficient with increasing bandwidth and number of steps of signals, particularly given selective fading, it is provided that the combiner circuit contains a control circuit for the combination phase, the control circuit being composed of a maximum power control circuit and of two preceding, supplementary circuits for varying the amplitudes of the main and diversity signals. The amplitude variation of the main and diversity channel spectrum occurs in such a fashion that the signal spectra are split in the appertaining branches of the two supplementary circuits by respective identical bandpass filters for the lower spectrum half and the upper spectrum half, the powers of the sub-bands are measured at the outputs of the bandpass filters and both sub-bands are set to approximately identical values.

REFERENCES:
patent: 4334316 (1982-06-01), Tanaka
patent: 4354276 (1982-10-01), Karabinis
patent: 4512034 (1985-04-01), Greenstein et al.
patent: 4710975 (1987-12-01), Okamoto et al.
patent: 4939791 (1990-07-01), Bochmann et al.

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