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For good combining linearity, the matched combiner is generally used.
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In [23], a multilevel LINC architecture which can increase the efficiency of the matched combiner was proposed.
Simulation results in [22] show that the power efficiency of the LINC transmitter with the matched power combiner is similar to that of the conventional transmitter without LINC.
Simulation results in [25] show that the efficiency of the combinerless LINC system is about 6 dB higher than the LINC system with the matched combiner.
However, the matched combiner will induce the severe power loss for high PAPR signals.
Additional simplifications stem from the fact that the combiner is matched to the antenna to Z 0; although if this condition was not fulfilled, the following analysis would be still valid.
However, this dependence should be a second-order effect, as the combiner is supposed to be well matched.
Moreover, the ICI cancelation capability of the chip-level combiner and symbol-level combiner is better than that of LLR-level combining.
Therefore, our choice for the inner combiner is a simple maximal ratio combiner (MRC).
The combiner is similar to an equal gain combiner (EGC), with the function ensuring samples to be combined in a constructive way.
A Ka-band four-way passive power combiner is designed and measured.
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