An arrangement for a pre-distortion-compensated transmitter for a communication system, comprising: an electronic processor circuit 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 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 configured to generate a sample signal from the amplified version; and a transmitter observation receiver, TOR, 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, configured to convert the sample signal into a digital sample signal, and at least one digital down-converter 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 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 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 configured to generate a sample signal from the amplified version; and a transmitter observation receiver, TOR, 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, configured to convert the sample signal into a digital sample signal, and at least one digital down-converter 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, configured to convert the sample signal into a digital sample signal, and at least one digital down-converter 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. <EOS>