Abstract
AbstractThis paper investigates the performances of the trellis‐coded modulation (TCM) systems under impulsive noise environment. Conventionally, receivers for a TCM system have been designed based on Euclidean distances between signal sequences assuming their use under Gaussian noise environments. These receivers are not suitable for impulsive noise environments having statistics significantly different from Gaussian noise and thus designs based on the statistics of impulsive noise are needed. The error event probability characteristics of TCM signals received by conventional‐type receivers have been obtained, and it has been clarified that coding gain is obtained even under impulsive noise when the carrier‐to‐noise power ratio (CNR) is sufficiently large, and there is a range of CNR at which the error event probability characteristics of TCM signals become worse than those of uncoded signals.Next, it is shown that the error event probability characteristics of TCM signals are inferior to those of the case in which uncoded signals are received by optimum receivers designed by considering impulsive radio noise. In addition, it has been shown that optimum receivers for TCM systems under impulsive radio noise can simply be constructed by adding a number of circuits to conventional‐type TCM receivers, and their performances exceed those of the case in which uncoded signals are received by optimum receivers at any CNR and great coding gain is obtained.
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