Pulse or digital communications – Repeaters – Testing
Patent
1989-09-18
1991-09-10
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
328145, 375102, H04B 110
Patent
active
050480596
ABSTRACT:
The invention relates to a method and an arrangement intended for radio communication systems and effective in digitalizing and subsequently processing numerically arbitrary radio signals. The signals are represented by composite (complex) vectors which have been subjected to disturbances in the system, such that information in the signals has been lost. This information is restored in its entirety when practising the present invention. For the purpose of solving this problem, the inventive digitalizing arrangement includes a multistage logarithmic amplifier chain (A) in which each stage is connected to a separate detector (D), the output signals of which are added in an adder. The adder output signals are then transmitted to a first A/D-converter (AD1) for digitalizing and converting the amplitude components of the signal. At the same time, the undetected signal from the saturated output stage in the amplifier chain is transmitted to a second A/D-converter for digitalizing and converting the phase components of the signal. The digital values obtained on the outputs of the AD-converters (AD1, AD2) are applied to different inputs of a digital signal processor (MP) for numerical processing of the pairwise received digital values in a manner such as to restore the complete vector characteristic of the signal.
REFERENCES:
patent: 3496298 (1970-02-01), Crookshanks et al.
patent: 3668535 (1972-06-01), Lansdowne
patent: 3849595 (1974-11-01), Ishiguro
patent: 4492930 (1985-01-01), Knowles et al.
The article by W. L. Barber et al., "A True Logarithmic Amplifier for Radar IF Applications", IEEE Journal of Solid-State Circuits, vol. SC-15, No. 3, Jun. 1980.
Safourek Benedict V.
Telefonaktiebolaget LM Ericsson
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