A method performed by a wireless device for transmitting a signal in a first communication system that is frequency-domain multiplexed with a second communication system, wherein the first communication system uses single-carrier, linear modulation and the second communication system uses orthogonal frequency division multiplexing, OFDM, characterized in that the method comprising: generating, by a modulator of the wireless device, a modulated signal that represents one or more information symbols, wherein the modulated signal includes one or more modulation symbols of the first communication system with each modulation symbol having: a period that corresponds to a symbol rate of the second communication system; and a starting time such that the modulation symbol starts in a cyclic prefix interval of modulation symbols of the second communication system; filtering, by a pulse shaping filter of the wireless device, the modulated signal to obtain the filtered modulated signal, wherein the pulse shaping filter is configured to operate with a period that corresponds to the symbol rate of the second communication system and has a frequency response that reduces a magnitude of the modulated signal at a frequency that corresponds to a frequency of at least one carrier or sub-carrier of a signal transmitted in the second communication system, determining a carrier frequency of the filtered modulated signal, wherein the carrier frequency is in a guard band of the second communication system; adjusting the carrier frequency to compensate for a decay in magnitude in the guard band of the second communication system; and transmitting, by a transmitter of the wireless device, the filtered modulated signal at a carrier or sub-carrier frequency of the first communication system that is different from a carrier or sub-carrier frequency of the second communication system, wherein said transmitting includes transmitting the filtered modulated signal at the carrier frequency. generating, by a modulator of the wireless device, a modulated signal that represents one or more information symbols, wherein the modulated signal includes one or more modulation symbols of the first communication system with each modulation symbol having: a period that corresponds to a symbol rate of the second communication system; and a starting time such that the modulation symbol starts in a cyclic prefix interval of modulation symbols of the second communication system; a period that corresponds to a symbol rate of the second communication system; and a starting time such that the modulation symbol starts in a cyclic prefix interval of modulation symbols of the second communication system; filtering, by a pulse shaping filter of the wireless device, the modulated signal to obtain the filtered modulated signal, wherein the pulse shaping filter is configured to operate with a period that corresponds to the symbol rate of the second communication system and has a frequency response that reduces a magnitude of the modulated signal at a frequency that corresponds to a frequency of at least one carrier or sub-carrier of a signal transmitted in the second communication system, determining a carrier frequency of the filtered modulated signal, wherein the carrier frequency is in a guard band of the second communication system; adjusting the carrier frequency to compensate for a decay in magnitude in the guard band of the second communication system; and transmitting, by a transmitter of the wireless device, the filtered modulated signal at a carrier or sub-carrier frequency of the first communication system that is different from a carrier or sub-carrier frequency of the second communication system, wherein said transmitting includes transmitting the filtered modulated signal at the carrier frequency.