An arrangement (300, 400, 500, 600, 600') for a pre-distortion-compensated transmitter for a communication system, comprising: an electronic processor circuit (308, 408, 508, 608, 608') configured to convert a base-band signal to be transmitted to a spectrally shifted, pre-distorted signal to be transmitted based on at least one compensation signal; a power amplifier (603, 406, 506, 606, 606') configured to generate an amplified version of the spectrally shifted, pre-distorted signal to be transmitted, wherein the amplified version is in one communication band of a plurality of communication bands used in the communication system; a coupler (304, 404, 504, 604, 604') configured to generate a sample signal from the amplified version; and a transmitter observation receiver, TOR, (310, 410, 510, 610, 610') configured to receive the sample signal and generate at least one compensation signal based on the sample signal, wherein the TOR includes: a wideband analog-to-digital converter, ADC, (314, 414, 514, 614, 614') configured to convert the sample signal into a digital sample signal, and at least one digital down-converter (312, 412, 512, 612) configured to generate the at least one compensation signal based on the digital sample signal, wherein the wideband ADC and the at least one digital down-converter enables the arrangement to operate in multiple communication bands in a time-shared way as the at least one digital down-converter selectively observes one communication band at a time, wherein the at least one compensation signal is generated such that a signal to be transmitted that is within a bandwidth that simultaneously encompasses multiple communication bands is compensated, and the electronic processor circuit converts the base-band signal to be transmitted such that a relationship between the base-band signal to be transmitted and the sample signal is substantially linear with constant phase. an electronic processor circuit (308, 408, 508, 608, 608') configured to convert a base-band signal to be transmitted to a spectrally shifted, pre-distorted signal to be transmitted based on at least one compensation signal; a power amplifier (603, 406, 506, 606, 606') configured to generate an amplified version of the spectrally shifted, pre-distorted signal to be transmitted, wherein the amplified version is in one communication band of a plurality of communication bands used in the communication system; a coupler (304, 404, 504, 604, 604') configured to generate a sample signal from the amplified version; and a transmitter observation receiver, TOR, (310, 410, 510, 610, 610') configured to receive the sample signal and generate at least one compensation signal based on the sample signal, wherein the TOR includes: a wideband analog-to-digital converter, ADC, (314, 414, 514, 614, 614') configured to convert the sample signal into a digital sample signal, and at least one digital down-converter (312, 412, 512, 612) configured to generate the at least one compensation signal based on the digital sample signal, wherein the wideband ADC and the at least one digital down-converter enables the arrangement to operate in multiple communication bands in a time-shared way as the at least one digital down-converter selectively observes one communication band at a time, a wideband analog-to-digital converter, ADC, (314, 414, 514, 614, 614') configured to convert the sample signal into a digital sample signal, and at least one digital down-converter (312, 412, 512, 612) configured to generate the at least one compensation signal based on the digital sample signal, wherein the wideband ADC and the at least one digital down-converter enables the arrangement to operate in multiple communication bands in a time-shared way as the at least one digital down-converter selectively observes one communication band at a time, wherein the at least one compensation signal is generated such that a signal to be transmitted that is within a bandwidth that simultaneously encompasses multiple communication bands is compensated, and the electronic processor circuit converts the base-band signal to be transmitted such that a relationship between the base-band signal to be transmitted and the sample signal is substantially linear with constant phase.