Improved LINC power transmission using a quadrature outphasing technique

A new improved approach to LINC power transmission is presented based on a quadrature outphasing technique, which depends on the constant envelope decomposition of the in-phase and quadrature parts of the input signal. In this approach, the processing of the resultant constant envelope components requires a bandwidth far smaller than if a simple LINC transmission technique were used, resulting in reduced sensitivity to components mismatch, far less spectral regrowth and superior linearity than the simple LINC approach. Experimental results at HF band show that the new technique improves the spectral re-growth by more than 10 dB for an 8-ary DPSK signal compared to the regular LINC transmission.