Abstract
The recent research on mobile communication systems has triggered increasing interest in multi-band transmitters. Our recent work advanced the spectrum modeling to cross-modulation of dual-band amplified orthogonal frequency-division multiplexing (OFDM) signals. However, it was limited to an assumption that the signal bandwidth in one band cannot be more than twice the signal bandwidth in the other band. This assumption may not always be valid; for example, the bandwidth for one long-term evolution signal could be multiple times wider than the bandwidth for the adjacent channel. In this paper, we extend the amplified spectrum model beyond that assumption. Together with the earlier work, this comprehensive model allows RF designers to predict the amplified dual-band spectrum of OFDM signals with no bandwidth restriction. The experimental measurements match well the analytic predictions.
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