A method, in a transmitting node, the method comprising: forming a first signal having a first integer number of symbol intervals in each of one or more time intervals of a predetermined length; forming a second signal having a second integer number of symbol intervals in each of the one or more time intervals of the predetermined length, the second integer number differing from the first integer number; wherein the first and second signals have first and second subcarrier spacings, respectively, the first and second subcarrier spacings differing from one another; simultaneously transmitting the first and second signals in a frequency band, such that the first and second signals are frequency-domain multiplexed in the frequency band and such that a symbol interval starting time in the first signal is aligned with a corresponding symbol interval starting time in the second signal at least once per time interval and such that the predetermined length of the time intervals is a periodicity of a transmission of a certain sequence in any of the signals, wherein said transmitting is performed during one or more transmit intervals of a time-division-duplexing, TDD, scheme, wherein switching between transmit intervals and receive intervals of the TDD scheme is performed only at switching times separated by an integer number of the time intervals of the predetermined length; wherein each symbol interval in the first signal comprises a symbol duration and a cyclic prefix duration, the cyclic prefix duration varying among the symbol intervals according to a predetermined pattern; and wherein symbol and cyclic prefix durations of the first signal and the second signal are selected so that the following equation is met: ∑ x = 0 X − 1 Tcp _ 1 x + Tsymb _ 1 = ∑ y = 0 Y − 1 Tcp _ 2 y + Tsymb _ 2 = T, with: X being the first integer number, Tcp_1(x) being the cyclic prefix duration of the x-th symbol of the first signal, with 0≤x<X, Tsymb _1 being the first symbol duration, Y being the second integer number, Tcp_2(y) being the cyclic prefix duration of the y-th symbol of the second signal, with 0≤y<Y, Tsymb_2 being the second symbol duration. forming a first signal having a first integer number of symbol intervals in each of one or more time intervals of a predetermined length; forming a second signal having a second integer number of symbol intervals in each of the one or more time intervals of the predetermined length, the second integer number differing from the first integer number; wherein the first and second signals have first and second subcarrier spacings, respectively, the first and second subcarrier spacings differing from one another; simultaneously transmitting the first and second signals in a frequency band, such that the first and second signals are frequency-domain multiplexed in the frequency band and such that a symbol interval starting time in the first signal is aligned with a corresponding symbol interval starting time in the second signal at least once per time interval and such that the predetermined length of the time intervals is a periodicity of a transmission of a certain sequence in any of the signals, wherein said transmitting is performed during one or more transmit intervals of a time-division-duplexing, TDD, scheme, wherein switching between transmit intervals and receive intervals of the TDD scheme is performed only at switching times separated by an integer number of the time intervals of the predetermined length; wherein each symbol interval in the first signal comprises a symbol duration and a cyclic prefix duration, the cyclic prefix duration varying among the symbol intervals according to a predetermined pattern; and wherein symbol and cyclic prefix durations of the first signal and the second signal are selected so that the following equation is met: ∑ x = 0 X − 1 Tcp _ 1 x + Tsymb _ 1 = ∑ y = 0 Y − 1 Tcp _ 2 y + Tsymb _ 2 = T, X being the first integer number, Tcp_1(x) being the cyclic prefix duration of the x-th symbol of the first signal, with 0≤x<X, Tsymb _1 being the first symbol duration, Y being the second integer number, Tcp_2(y) being the cyclic prefix duration of the y-th symbol of the second signal, with 0≤y<Y, Tsymb_2 being the second symbol duration.