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Method-of-compensating-the-dependence-of-the-useful-transmitter-signal-on-the-transfer-function-of-a-combiner-filter

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Method of compensating the dependence of the useful transmitter signal on the transfer function of a combiner filter

Details

Inventors: Victorin, John A.;
Assignee: Telefonaktiebolaget LM Ericsson (Stockholm, SE)
Primary Examiner: Urban; Edward F.
Assistant Examiner: To; Doris
Attorney, Agent or Firm: Burns, Doane, Swecker & Mathis

A method of compensating the dependence of the useful transmitter signal on the transfer function of a combiner filter in a mobile radio communication system includes filtering the useful transmitter signal in the base band before it is fed to the combiner filter. This is done in connection with carrier frequency modulation with a filter, the total transfer function of which at least approximately comprises the inverted value of the transfer function of the combiner filter transformed to the base band.

DETAILED DESCRIPTION An object of the present invention is to provide a method of compensating the dependence of the useful transmitter signal on the transfer function of a combiner filter in a mobile radio communication system in such a way that the above phase and amplitude errors can be reduced or eliminated.
In accordance with the present invention this object is achieved filtering the useful transmitter signal in connection with carrier frequency modulation in the base band with a filter, the total transfer function of which at least approximately comprises the inverted value of the transfer function of the combiner filter (COMB) transformed to the base band.

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