| 摘要 |
The present invention relates to a multicarrier circuit arrangement and a method for linearising a multicarrier circuit arrangement in which frequency channels are combined by using a complex mixing operation to generate a single composite complex signal, so as to achieve a complex channel separation. A predistorted complex signal is then generated by applying a complex predistortion to said complex signal. Thereby, an efficient linearisation of wideband multicarrier circuit arrangements can be achieved, since the bandwidth requirements of digital predistortion are relaxed by enabling a baseband predistortion of multicarrier signals. Furthermore, combining different frequency chan-nels at digital baseband domain makes it possible to use only one transmit chain, which means considerable reduction in the needed amount of digital/analogue components. Fore-mentioned can also be applied to feedback chain, i.e. all the frequency channels can be down-converted to predis-torter for calculation of new predistortion coefficients with only one down-conversion chain. Only one baseband pre-distorter is needed to linearise all the transmitted infor-mation because of complex channel separation. All of the intelligence and adaptivity in the proposed system is lo-cated in the digital domain, thereby enabling stable and accurate control of the transmitted signal in every operat-ing conditions. |
