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In this paper, multicarrier spread-spectrum radio transmission is taken into account, in which signal energy spreading is based on Walsh-Hadamard transform. The considered system operates in wireless indoor environment, in the presence of both, the additive white Gaussian noise and the impulse noise. For such a transmission, unbalanced effect of the impulse noise on distinct symbols can be expected. Below, we propose a method of decision-margin adaptation, appropriately tailored for each symbol and the spreading sequence assigned to it. This method is based on erasures of unreliable symbols and the application of Reed-Solomon codes with erasure-correction capability. Simulation results show good erasure performance and thus, the proposed method should also result in the increased BER performance of the considered transmission scheme.