Multiplex communications – Generalized orthogonal or special mathematical techniques
Reexamination Certificate
2005-10-11
2005-10-11
Sam, Phirin (Department: 2661)
Multiplex communications
Generalized orthogonal or special mathematical techniques
C370S210000, C375S224000
Reexamination Certificate
active
06954420
ABSTRACT:
The invention relates to a method for displaying the mean modulation error MERRMSof 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 mkis 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 A2k,1+1: new measured value (instant 1+1) which should be filed in storage location k of the memory A2; A2k,l+l: previous measured value (instant 1) from storage location k of memory A2; mk: Actual measured error square for carrier k; k: Carrier number within the OFDM spectrum, grows with the frequency, k=0 . . . Kmax; 1: number of the symbol, grows with time, 0≦1; c) the mean modulation error MERRMSis 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 MERRMSvalue 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.
REFERENCES:
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patent: 5799038 (1998-08-01), Nowara et al.
patent: 5963589 (1999-10-01), Nagano et al.
patent: A1-19515037 (1995-10-01), None
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English Translation of French Patent Application No.: 2,742 613. pp. 1-22.
HP Press Release Online, 2 pages (1998).
Balz Christoph
Wolf Peter
Rohde & Schwarz GmbH & Co. KG
Wilson Robert W.
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