Design of TCM Signals for Class-A Impulsive Noise Environment

Shinichi MIYAMOTO  Masaaki KATAYAMA  Norihiko MORINAGA  

IEICE TRANSACTIONS on Communications   Vol.E78-B   No.2   pp.253-259
Publication Date: 1995/02/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Electromagnetic Compatibility)
signal design,  trellis coded modulation,  class-A impulsive noise,  length of error event,  optimum reception,  

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In this paper, a design of TCM signals for Middleton's class-A impulsive noise environment is investigated. The error event characteristics under the impulsive noise is investigated, and it is shown that the length of the signal sequence is more important than Euclidean distance between the signal sequences. Following this fact, we introduce the shortest error event path length as a measure of the signal design. In order to make this value large, increasing of states of convolutional codes is employed, and the performance improvement achieved by this method is evaluated. Numerical results show the great improvement of the error performance and conclude that the shortest error event path length is a good measure in the design of TCM signals under impulsive noise environment. Moreover, the capacity of class-A impulsive noise channel is evaluated, and the required signal sets expansion rates to obtain the achievable coding gain is discussed.