Method and apparatus for demodulating a received signal

A method of demodulating a received signal (a) comprising phasenumtastmodulierte transmitted or quadrature amplitude modulated sub-signals in a plurality of different frequency bands (f1-f8) wherein the received signal (a) is processed successively in several stages by all the input signals (a, I, Q, II, IQ, QI, QQ) each of the stages (each with two mutually orthogonal signals LO11, LO12, b, c, d , e) are multiplied to form two intermediate signals (I, Q, II ... QQ, III ... QQQ), wherein each of the intermediate signals to a stage serve as input signals of a respective following stage, and the received signal (a) input signal for the first stage is, wherein the intermediate signals from (III ... QQQ) of the last stage, an in-phase and / or quadrature component of each sub-signals of the different frequency bands (f1-f8) are determined, and wherein the different frequency bands are subdivided into at least two groups in the first stage, which are processed separately.