The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 11, 2005
Filed:
Sep. 23, 1999
Peter Wolf, München, DE;
Christoph Balz, München, DE;
Peter Wolf, München, DE;
Christoph Balz, München, DE;
Rohde & Schwarz GmbH & Co. KG, Munich, DE;
Abstract
The invention relates to a method for displaying the mean modulation error MERof a multiple carrier (OFDM) signal in which: a) The square of the error vector is calculated according to the relation (I) for each actual modulation symbol I of each individual carrier k of the multiple carrier signal; b) this value mis offset with the content of a storage location of a memory, said storage location being assigned to the same carrier k, which comprises the same number of storage locations as the OFDM signal carrier, according to relation (II) (iteration formula) with A: new measured value (instant 1+1) which should be filed in storage location k of the memory A; A: previous measured value (instant 1) from storage location k of memory A; m: Actual measured error square for carrier k; k: Carrier number within the OFDM spectrum, grows with the frequency, k=0 . . . K; 1: number of the symbol, grows with time, 0≦1; c) the mean modulation error MERis subsequently calculated for each carrier from these values of the storage locations according to relation (III), whereby {overscore (VM)} is the quadratically weighted mean value of the amplitude of all ideal signal states of the modulation type, used each time, of a carrier modulated with useful data, and finally, d) this MERvalue is then graphically represented with the number of the carriers as an abscissa for each individual carrier k as an ordinate value of a diagram.