Adaptive Multi-Carrier Demodulator for Variable Polarization Frequency Division Multiplexing

This paper proposes a new Variable Polarization Frequency Division Multiplexing (VPFDM) demodulator for Ku broadband mobile satellite communications. VPFDM allows each user to utilize multi-carrier frequency slots of the Vertical and Horizontal polarizations simultaneously. Since the VPFDM demodulator cancels cross-polarization interference by using signal processing, the user station can use a simple antenna that does not track polarization. In this paper, we introduce a new VPFDM demodulator with adaptive multi-carrier modulation (AMCM); it can vary the modulation level carrier by carrier to enhance frequency and power efficiency. We then propose a noise and frequency offset tolerant AFC that is the key to the success of AMCM. Finally, simulation results show its excellent performance.