NASA is studying coding techniques in an effort to achieve communications from spacecraft at lower effective isotropic radiated power. Presently NASA's coding standards support a (2,1,6) convolutional inner code and a Reed-Solomon (255,223'8) outer code; during the past two years studies were conducted on the performance of a long constraint length (2,1,14) convolutional code and the Turbo codes. Flight experiments will lead to results on the actual performance, complexity and implementation of such coding systems.
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