In this paper, a termination strategy for subcarrier equalizer tap loading algorithms is proposed. The objective of these algorithms is to non-uniformly distribute equalizer taps incrementally across the subcarriers of a multicarrier system to reduce the overall distortion introduced by the channel. Knowing when enough equalizer taps have been allocated is the task of the algorithm's termination strategy, which employs a number of criteria in the decision process. The proposed termination strategy, which is based on limiting the total number of taps used by the system, is presented and compared with three other strategies proposed earlier. Simulation results for a system employing the proposed strategy using different total tap limits emphasize the advantages of equalizer tap loading algorithms over conventional multicarrier equalization schemes.
Abstract-We present a novel algorithm for defining the lengths of subcarrier equalizers employed by wireless multicarrier transmission systems operating in frequency-selective fading channels. The equalizer lengths across the subcarriers are incrementally varied in a "greedy" fashion until the global cost function is below some prescribed threshold. By varying the equalizer lengths, the overall complexity of the equalization is constrained while the system meets a minimum error performance. Moreover, we investigate four strategies for terminating the proposed algorithm when an adequate number of equalizer taps have been allocated in this process. The results show that a system that employs variable-length equalizers defined by the proposed algorithm can achieve an improvement in error robustness of as much as an order of magnitude, relative to a system that employs constantlength equalizers with the same overall complexity.
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