Low-Complexity Nonlinearity Post Compensator for Shared Band Transmission in Satellite Communication

In this paper, we propose a low-complexity nonlinearity post compensation technique for shared band transmission in the satellite communication system. To reduce the computational overhead of the Volterra equalizer with an adaptive algorithm, we employ the structure of the nonlinearity post compensator using a look-up table (LUT) with the error detector. The error detector computes the amplitude and angle errors between the reference signal and the received signal to estimate the characteristics of a travelling wave tube amplifier (TWTA). By accumulating the computed errors iteratively, the LUT can estimate the compensation values. Finally, we can compensate the nonlinearity of the TWTA by reading these compensation values from the LUT. The effectiveness of the proposed low-complexity technique is verified by simulation results.