A Computational Cost Reduction Scheme for a Post-Distortion Type Nonlinear Distortion Compensator of OFDM Signals (Special Issue on the Latest Development of Telecommunication Research)

概要

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A computational cost reduction scheme for a post-distortion type nonlinear distortion compensator of OFDM signals is proposed, and compared with the conventional suboptimum detection scheme. The proposed schem utilizes the principle that a complex OFDM signal can be demodulated with not only both I-phase (real part) and Q-phase (imaginary part) components, but also either of them. Usually each phase of an OFDM signal exibits different signal envelope and they are distorted differently by the nonlinearity of a power amplifier. Consequently, three output sequence patterns can be obtained at the receiver. By comparing these outputs, we can know the erroneous positions of these sequences to some extent. By the aid of this comparison, we need to evaluate only a limited number of replicas for the compensation process of the post-distortion type nonlinear distortion compensator, which results in the computational cost reduction. We have proposed four new compensation schemes based on this idea and derived thir performance in terms of the bit error rate and the average number of calculations.
社団法人電子情報通信学会の論文
1998-12-25