Adaptive Back-Off Nonlinearity Compensation for Interference Canceller in Carrier Super-Positioning Satellite Communications

Takao HARA  Kenta KUBO  Minoru OKADA  

IEICE TRANSACTIONS on Communications   Vol.E94-B    No.7    pp.2022-2031
Publication Date: 2011/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.2022
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
satellite communications,  frequency reuse,  interference canceller,  nonlinear TWTA,  

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Transmission performance of carrier superposed signals for frequency reuse are significantly degraded when transmitted through a satellite channel containing a nonlinear device. The extent to which the signals are degraded depends on the operating level (back off) of the transponder. This paper proposes a method to compensate for the effects of nonlinearity in the interference canceller by giving the same nonlinearity to a replica with the capability to automatically track the back off of the satellite transponder. Computer simulations show that the proposed technique significantly enhances system performance at all transponder operating levels even though it can be simply implemented in the canceller by digital signal processing circuits.