Patent ID: 6954420

Claim:
A method for displaying a mean modulation error ratio MER Rms of an orthogonal frequency division and multiplexing (OFDM) multicarrier signal, the method comprising the steps of: a) calculating, for each current modulation symbol I of each individual carrier k of the multicarrier signal, the square m k of the error vector according to: m k =|error vector k | 2 b) setting off M k against contents of a memory location of a first memory that is associated with the same carrier k, the first memory having as many memory locations as the OFDM signal has carriers, according to: A2 k , l + 1 = ( A2 k , l · l + m k ) ( l + 1 ) wherein A 2 k,l+1 is a new measured value (instant l+1) that is to be stored in memory location k of the first memory A 2 , A 2 2,l is a previous measured value (instant l) from memory location k of the first memory, m k is a current measured error square for carrier k, k is a carrier number within the OFDM spectrum, which increases with the frequency, k=0 . . . K max , and l is the number of the symbol, which increases with time, 0≦l, c) calculating a mean modulation error MER RmS for each carrier from the values of the first memory locations according to: MER RMS , k = 100 · A2 k VM _ ⁢ ⁢ ( % ) where {overscore (VM)} is a square weighted mean value of the amplitudes of all ideal signal statuses of a type of modulation used in each case of a carrier modulated with user data, and d) displaying on a display device the MER RmS value as a graph for each individual carrier k as an ordinate value in a graph with the number of carriers as abscissa.