Method and device for the non-linear transformation and envelope-scaling of ofdm signals

摘要

A process for the non-linear transformation and envelope-scaling one of n_F sinusoidal subcarriers existing ofdm symbol of the bandwidth b, the data content with the cardinality m of the modulation alphabet by means of one of thepossible realization of the data vector is given, in which the n_F Components the transmitted data symbols and the complex amplitudes of the n_F Subcarriers, characterised in that, with a from a set of {S⁽¹⁾..S^(S)} of s different image matrices of the dimension n.sub.d_F×N_F selected matrix S^(s) from the data vector d^(r) according to (a2) of the reproduced data vector is formed, and this with the fourier matrix in the vector is transformed, and from u^{(r, s)} according to (a4) through d / a conversion the time-continuous signal ÷^{(r, s)}(t) is formed, which is connected to one of a range (0, ∞) selected, referred to as preclipping-factor quantity g is multiplied, the thereby resulting signal g÷^{(r, s)}(t) is provided, in accordance with the latter from u$(r,\; s,\; g)\; /\; cl$(t) to (a5) by removal of the spectral components outside of the ofdm bandwidth b by means of low-pass filtering the signal u$(r,\; s,\; g)\; /\; cl,\; lp$(t) is generated, undaus this finally with a selected envelope maximum a the complex envelopethe ofdm symbol to be transmitted is formed, from the set {S⁽¹⁾..S^(S)} after the selection of the preclipping-factor g of those image matrix S^(s) selected and in (a3) is used, which the papr of the ofdm symbol with the complex envelope u^{(r, s, g, a)}(t) to (a6) is minimized.