Baseband Equivalent Models Resulting From Dynamic Continuous-Time Perturbations In Phase-Amplitude Modulation-Demodulation Schemes (Expanded version)
نویسندگان
چکیده
We consider baseband equivalent representation of transmission circuits, in the form of a nonlinear dynamical system S in discrete time (DT) defined by a series interconnection of a phase-amplitude modulator, a nonlinear dynamical system F in continuous time (CT), and an ideal demodulator. We show that when F is a CT Volterra series model, the resulting S is a series interconnection of a DT Volterra series model of same degree and memory depth, and an LTI system with special properties. The result suggests a new, non-obvious, analytically motivated structure of digital pre-compensation of analog nonlinear distortions such as those caused by power amplifiers in digital communication systems. The baseband model and the corresponding digital compensation structure readily extend to OFDM modulation. MATLAB simulation is used to verify proposed baseband equivalent model and demonstrate effectiveness of the new compensation scheme, as compared to the standard Volterra series approach. ∗This work was supported by DARPA Award No. W911NF-10-1-0088. Shorter version of this paper was published in the proceedings of the 55th IEEE Conference on Decision and Control [29] †Omer Tanovic and Alexandre Megretski are with the Laboratory for Information and Decision Systems (LIDS), Department of Electrical Engineering and Computer Science (EECS), Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA {otanovic,ameg}@mit.edu ‡Yan Li was with the Research Laboratory of Electronics, EECS, MIT. She is now with NanoSemi Inc., Waltham, MA 02451, USA [email protected] §Vladimir M. Stojanovic is with the Department of Electrical Engineering and Computer Sciences, University of California Berkeley, Berkeley, CA 94720, USA [email protected] ¶Mitra Osqui was with LIDS, EECS, MIT. She is now with Analog Devices | Lyric Labs, Cambridge, MA 02142, USA [email protected] ar X iv :1 51 0. 01 70 5v 2 [ cs .S Y ] 1 7 M ar 2 01 7
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عنوان ژورنال:
- CoRR
دوره abs/1510.01705 شماره
صفحات -
تاریخ انتشار 2015